CA2246925A1 - Mobile telecommunication apparatus - Google Patents
Mobile telecommunication apparatus Download PDFInfo
- Publication number
- CA2246925A1 CA2246925A1 CA002246925A CA2246925A CA2246925A1 CA 2246925 A1 CA2246925 A1 CA 2246925A1 CA 002246925 A CA002246925 A CA 002246925A CA 2246925 A CA2246925 A CA 2246925A CA 2246925 A1 CA2246925 A1 CA 2246925A1
- Authority
- CA
- Canada
- Prior art keywords
- earth conductor
- circuit board
- printed circuit
- mobile telecommunication
- antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000004020 conductor Substances 0.000 claims abstract description 189
- 230000005404 monopole Effects 0.000 claims description 31
- 238000007747 plating Methods 0.000 claims description 9
- 238000005530 etching Methods 0.000 claims description 7
- 230000005855 radiation Effects 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 56
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 45
- 239000011889 copper foil Substances 0.000 description 45
- 230000003247 decreasing effect Effects 0.000 description 18
- 238000010276 construction Methods 0.000 description 17
- 230000010355 oscillation Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 230000002238 attenuated effect Effects 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 5
- 230000005684 electric field Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- VJYFKVYYMZPMAB-UHFFFAOYSA-N ethoprophos Chemical compound CCCSP(=O)(OCC)SCCC VJYFKVYYMZPMAB-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3827—Portable transceivers
- H04B1/3833—Hand-held transceivers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
- H01Q1/244—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas extendable from a housing along a given path
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/106—Microstrip slot antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/005—Patch antenna using one or more coplanar parasitic elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/16—Folded slot antennas
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/14—Structural association of two or more printed circuits
- H05K1/141—One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/0929—Conductive planes
- H05K2201/093—Layout of power planes, ground planes or power supply conductors, e.g. having special clearance holes therein
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
- H05K2201/09663—Divided layout, i.e. conductors divided in two or more parts
Abstract
A mobile telecommunication apparatus reduces current around a control circuit on a printed circuit board so as to lessen background noise and to improve the radiation characteristics. The mobile telecommunication apparatus includes a printed circuit board located in a body of the mobile telecommunication apparatus; a radio circuit including a modulator circuit and a demodulator circuit arranged on the printed circuit board; a control circuit including a voice circuit for processing a voice signal arranged on the printed circuit board; a first earth conductor for grounding the radio circuit; a second earth conductor for grounding the control circuit and being continuous with the first earth conductor; an antenna connected to the radio circuit; and a slit arranged between the first earth conductor and the second earth conductor.
Description
. CA 0224692~ 1998-09-10 MOBILE TELECOMMUNICATION APPARATUS
BACKGROUND OF THE INVENTION
Field of the Invention S The present invention relates to a mobile telecommunication appalallls such as a portable telephone or a telephone of the kind used in Japan for the Personal Handyphone System (PHS).
Description of the Prior Art Figure 18 illustrates a conventional mobile telecommunication appa~allls shown in J~p~nese Laid-Open Patent Publication No. 7-74807, "A Portable Telephone". Figure 18 includes a body 1 of a telecommunication appa.~lus, an antenna 2, a tr~n~mitter 3, and a receiver 4.
Figure 19 is a perspective view which illustrates an internal construction of a 15 conventional mobile telecommunication appa.~lus. Figure 20 and Figure 21 are sectional views seen from a line A-B and a line C-D in Figure 19, respectively.
In Figure 19 - Figure 21, the mobile telecommunication appa.~lus includes a printed circuit board 5, a radio circuit 6 formed on the printed circuit board 5, a control circuit 7 formed on the printed circuit board 5, a voice circuit 8, shield cases 9a and 9b 20 surrounding the radio circuit 6, a feeder line 10, a feeding circuit 11, an earth conductor 12 for the radio circuit 6, an earth conductor 13 for the control circuit, an earth conductor 14 formed between the earth conductors 12 and 13, and a battery 15.
The printed circuit board 5 is actually a multi-layered circuit board. Parts constructing the radio circuit 6 and the control circuit 7 are mounted on the printed 25 circuit board 5. The voice circuit 8 is included in the control circuit 7.
The shield cases 9a and 9b are equipped to shield external noise coming into theradio circuit 6 and to prevent the escape of radiation to the outside. However, since the shield construction around the control circuit 7 is complicated, the shield construction is not generally included.
The ~ntPnn~ 2 generally uses a ~/4 monopole antenna (~ indicates a wavelength of the frequency being used) or a ~/2 monopole antenna. Impedance of a ~/4 monopole antenna is easily matched and the structure of the feeding circuit 11 is relatively simple.
The radiation characteristic of the ~/2 monopole antenna is better than the ~/4 monopole CA 0224692~ 1998-09-10 ~nteMn~ although the construction of feeding circuit 11 becomes a little bit complicated due to impedance matching. The earth conductor 12, the earth conductor 13, and the earth conductor 14 are equipped on the printed circuit board 5. The earth conductor 14 is equipped between the earth conductor 12 and the earth conductor 13, and they are 5 connected electrically.
The operation of the conventional mobile telecommunication appal~lus is explained below. During tr~n~mitting~ a human voice from a tr~n~mitter 3 is converted to a voice signal through the voice circuit 8 in the control circuit 7. The voice signal is modulated to a high frequency signal by the radio circuit 6. The modulated high 10 frequency signal is radiated from the ~ntPnn~ 2 via the feeding circuit 11.
On the other hand, during receiving, a high frequency modulated signal which enters the radio circuit 6 via the feeding circuit 11 from the antenna 2 is demodulated to a voice signal through a demodulator circuit. The demodulated voice signal istr~n~duced into an audible human voice by the receiver 4 via the voice circuit 8 in the 15 control circuit 7. Also, the battery 15 supplies power to the radio circuit 6 and the control circuit 7.
Figure 22 illustrates an example of a longitu(lin~l current distribution on the side of the printed circuit board 5 facing the battery 15 in the conventional mobile telecommunication appal~lus using a ~/4 monopole ~ntPnn~ as the antenna 2.
In Figure 22, numerals 16 and 17 indicate current amplitude and phase which distribute along the ~nt~,nn~ 2 and the radio circuit 6, respectively. Numerals 18 and 19 indicate current amplitude and phase which distribute along the control circuit 7, respectively.
Current flowing through the earth conductor 14 equipped between the radio 25 circuit 6 and the control circuit 7 is amplified by a parallel plane mode oscillation between the battery 15 and the control circuit 7 that generates a sinewave current 18 having a large amplitude.
This current having a sinewave distribution greatly influences the voice circuit 8 in the control circuit 7. This current generates noise in the voice signal which is then 30 tr~n~d-lced by the receiver 4 thereby decreasing the speech quality.
Also, the phase 19 of the current flowing along the control circuit 7 on the printed circuit board 5 is contrary to the phase 17 of current distributing between the antenna 2 and the radio circuit 6. Therefore, the ~nt~nn~ gain of the telecommunication CA 0224692~ 1998-09-10 apparatus toward the horizontal direction is extremely attenuated, which decreases the available communication distance.
SUMMARY OF THE INVENTION
It is an object of the present invention to reduce current around the control circuit on the printed circuit board and to obtain a mobile telecommunication appardtus having less background noise and good antenna radiation characteristics.
According to an aspect of the invention, a mobile telecommunication appaldlus includes a printed circuit board provided in a body of the mobile telecommunication 10 appalalus; a radio circuit including a modulator circuit and a demodulator circuit arranged on the printed circuit board; a control circuit including a voice circuit for proces~in~ a voice signal arranged on the printed circuit board; a first earth conductor for grounding the radio circuit; a second earth conductor for grounding the control circuit and being continuous with the first earth conductor; an antenna connected to the 15 radio circuit; and a slit arranged between the first earth conductor and the second earth conductor.
According to another aspect of the invention, a mobile telecommunication a~L~dlus includes first and second printed circuit boards provided in a mobile telecommunication apparatus; a radio circuit including a modulator circuit and a20 demodulator circuit arranged on the first printed circuit board; a control circuit including a voice circuit for processing a voice signal arranged on the second printed circuit board;
a first earth conductor for grounding the radio circuit on the first printed circuit board;
a second earth conductor for grounding the control circuit on the second printed circuit board; a third earth conductor on the second printed circuit board being electrically 25 connected with the second earth conductor; a connector for connecting the first earth conductor with the third earth conductor; an antenna being connected to the radio circuit;
and a slit arranged between the second earth conductor and the third earth conductor.
In one plefelled embodiment, the ~ntenn~ of the mobile telecommunication appa dlus is a slot inner antenna constructed by a ~/4 wavelength slot arranged at one 30 portion of the printed circuit board.
In another prerelled embodiment, the antenna of the mobile telecommunication apparatus is a ~/4 wavelength monopole antenna protruding outwards from the apparatus body.
CA 0224692~ 1998-09-10 The antenna of the mobile telecommunication apparatus can also be a ~/2 monopole antelllla protruding outwards from the apparatus body and which is excited from the inner ~ntenn~ by way of non-contact feeding, thereby providing a further alternative.
Preferably the slit is constructed by a pattern etching of the printed circuit board.
According to a further aspect of the invention, a mobile telecommunication appal~lus includes a printed circuit board provided in a body of the mobile telecommunication appa~t~ls; a radio circuit including a modulator circuit and ademodulator circuit arranged on the printed circuit board; a control circuit including a 10 voice circuit for processing a voice signal arranged on the printed circuit board; a first earth conductor formed on a first surface of the printed circuit board for grounding the radio circuit; a second earth conductor formed on a second surface of the printed circuit board for grounding the control circuit; a third earth conductor located on the second surface of the printed circuit board at a corresponding location facing the first earth 15 conductor and being electrically connected with the second earth conductor; a fourth earth conductor located on the first surface of the printed circuit board at a corresponding location facing the second earth conductor; a battery facing the fourth earth conductor;
an ~nt~nn~ connected to the radio circuit; and a first slit for electrically separatillg the first earth conductor and the fourth earth conductor; and a second slit arranged between 20 the second earth conductor and the third earth conductor.
According to a further aspect of the invention, a mobile telecommunication appa,~us includes a printed circuit board provided in a body of the mobile telecommunication apparatus; a radio circuit including a modulator circuit and ademodulator circuit arranged on the printed circuit board; a control circuit including a 25 voice circuit for processing a voice signal arranged on the printed circuit board; a first earth conductor formed on a first surface of the printed circuit board for grounding the radio circuit; a second earth conductor formed on a second surface of the printed circuit board for grounding the control circuit; a third earth conductor located on the second surface of the printed circuit board at a corresponding location facing the first 30 earth conductor for grounding the radio circuit; a fourth earth conductor located on the first surface of the printed circuit board at a cull~s~onding location facing the second earth conductor for grounding the conkol circuit; a battery being placed facing the fourth earth conductor; an antenna connected to the radio circuit; and a first slit for eleckically CA 0224692~ 1998-09-10 separating the first earth conductor and the fourth earth conductor; and a second slit for electrically separating the second earth conductor and the third earth conductor.
According to a further aspect of the invention, a mobile telecommunication appafat~ls includes a multi-layered printed circuit board equipped in a body of the mobile S telecommunication appald~us, the multi-layer includes a plurality of earth conductors and dielectric boards interl~ved between the ea~th conductors; each of the earth conductors including a first earth conductor for grounding a radio circuit and a second earth conductor for grounding the control circuit; a slit for electrically separating the first earth conductor and the second earth conductor; and a battery facing the second earth 10 conductors; wherein the first earth conductor on any surface of the dielectric boards is connected by through-hole plating to the second earth conductor on another surface of the dielectric boards through another of the earth conductors and another of the dielectric boards.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description given herein below and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
Figure 1 is a perspective view which illustrates an int~rn~l construction of a mobile telecommunication appa,~lus of a first embodiment of the present invention;
Figure 2 is a diagram showing one example of the current on the printed circuit board of the first embodiment of the present invention;
Figure 3 is a perspective view which illustrates a mobile telecommunication 25 apparatus of the second embodiment of the present invention;
Figure 4 is a side sectional diagram which illustrates a mobile telecommunication a~l)al~lus of the second embodiment of the present invention;
Figure S is a perspective view which illustrates a mobile telecommunication a~al~tus of the third embodiment of the present invention;
Figure 6 is a diagram showing each separated layer to show a slot antenna of thethird embodiment of the present invention;
Figure 7 is a diagram showing calculated values of longitudinal current distribution on the printed circuit board without a slit;
CA 0224692~ 1998-09-10 Figure 8 is a diagram showing calculated values of longitutlin~l current distribution on the printed circuit board with a slit in the third embodiment of the present invention;
Figure 9 is a perspective view showing a structural overview of a mobile 5 telecommunication a~pal~lus of the fourth embodiment of the present invention;Figure 10 is a perspective view showing a mobile telecommunication appal~us of a fifth embodiment of the present invention;
Figure 11 is a side sectional diagram to explain the operation principle of a mobile telecommunication appal~lus of the fifth embodiment of the present invention;
Figure 12 is a diagram showing calculated values of lonp~itu-lin~l current distribution on a printed circuit board without a slit in a mobile telecommunication apparatus having a non-contact antenna, which excites a )~/2 monopole antenna protruding towards from outside of the a~al~tus body;
Figure 13 is a diagram showing calculated values of lon~itu-lin~l current 15 distribution on a printed circuit board with a slit in a mobile communication of the fifth embodiment of the present invention;
Figure 14 is a perspective view showing a mobile telecommunication apparatus of a sixth embodiment of the present invention;
Figure 15 is a front view showing a printed circuit board provided in a mobile 20 telecommunication appaiatus of the sixth embodiment of the present invention;Figure 16 is a diagram showing a spatial relationship between a printed circuit board and a battery which are included in a mobile telecommunication apparatus of the seventh embodiment of the present invention;
Figure 17 is a diagram showing a spatial relationship between a printed circuit 25 board and a battery which are included in a mobile telecommunication a~p~dlus of an eighth embodiment of the present invention;
Figure 18 illustrates a conventional mobile telecommunication apparatus;
Figure 19 is a perspective view which illustrates an internal construction of a conventional mobile telecommunication appal~us;
Figure 20 and Figure 21 are sectional views seen from a line A-B and a line C-D
in Figure 19, respectively; and ~ CA 0224692~ 1998-09-10 Figure 22 illustrates an example of a longit~ltlin~l current distribution on theprinted circuit board facing a battery in the conventional mobile telecommunication appa~atus which uses a ~/4 monopole antenna.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Further scope of applicability of the present invention will become a~pa~e lt from the detadiled description given hereinafter. However, it should be understood that the det~iled description and specific examples, while indicating prefelled embodiments of 10 the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become al)parel-t to those skilled in the art from this detailed description.
Embodiment 1.
A first embodiment of the present invention is explained below. Figure 1 is a perspective view which illustrates an internal construction of a mobile telecommunication appa dtus of a first embodiment of the present invention.
A telecommunication appaldt~ls shown in Figures 1 and 2 includes a body 1 of, an antenna 2, a tr~n~mitt~r 3, a receiver 4, a printed circuit board 5, a radio circuit 6 20 formed in the printed circuit board 5, a control circuit 7 formed in the printed circuit board 5, a voice circuit 8, shield cases 9a and 9b surrounding the radio circuit 6, a feeder line 10, a feeding circuit 11, an earth conductor 12 for the radio circuit 6, an earth conductor 13 for the control circuit, an earth conductor 14 formed between the earth conductors 12 and 13, and a battery 15.
A slit 20 is notched between the radio circuit 6 and the control circuit 7 on the printed circuit board 5. The slit 20 does not extend the full width, leaving a narrow earth conductor 14 which connects the earth conductor 12 and the earth conductor 13.
The earth conductor 12 is referred to as a first earth conductor and the earth conductor 13 is referred to as a second earth conductor. The respective first earth conductors 12 30 and the second earth conductors 13 are part of the printed circuit board 5, and they are electrically connected via the earth conductor 14.
CA 0224692~ 1998-09-10 Figure 2 illustrates an example of currents flowing on the printed circuit board5. In Figure 2, arrows 21a - 21g replesellt the directions of current flowing on the earth conductor of printed circuit board 5.
The current 21b flowing longitu~in~lly on the earth conductor 12 of the printed 5 circuit board 5 is prevented by the slit 20 and flows alongside the slit 20 like the current 21c. Therefore, the current path alongside the slit 20 is longer and the current flowing through the path alongside the slit 20 is more attenuated. Also, the current 21d flowing longitu-lin~lly along the earth conductor 14 of the printed circuit board 5 is suppressed because of the narrower width of the earth conductor 14.
Thus, the parallel plane mode oscillation between the control circuit 7 and the battery 15 shown in Figure 22 is ~lppl~;ssed, and the current 21e- 21f around the control circuit 7 is re~uced. That is, the current amplitude which distributes along the control circuit 7 is reduced.
The printed circuit board 5 can be a multi-layered circuit board which comprises15 a single surface circuit board or a double surface circuit board, and the same current decreasing effect can be obtained regardless of the number of layers.
Embodiment 2.
Figure 3 shows a perspective view which illustrates a mobile telecommunication 20 appaldl~ls according to a second embodiment. Figure 4 is a sectional diagram of the mobile telecommunication apparatus depicted in Figure 3.
In Figure 3 and Figure 4, the mobile telecommunication appaldl~ls includes a first printed circuit board 22 equipped with a radio circuit 6 and a feeding circuit 11, a second printed circuit board 23 is equipped with a control circuit 7, shield cases 9a and 25 9b surrounding the radio circuit 6 and the feeding circuit 11, and a connector 24 for connecting the first printed circuit board 22 with the second printed circuit bodrd 23.
In this second embodiment, the antenna 2 is connected to the feeding circuit 11 on the edge of the first printed circuit board 22.
The slit 20 is arranged between the first earth conductor 12a, where the radio 30 circuit 6 is provided and the second earth conductor 13, where the control circuit 7 is provided. The lower portion of the third earth conductor 12b on the second printed circuit board 23 is connected to the first earth conductor 12a via the connector 24.
CA 0224692~ 1998-09-10 The slit 20 forms a narrow earth conductor 14 which connects the third earth conductor 12b and the second earth conductor 13. Other construction details of the second embodiment are the same as those of the first embodiment.
In the second embodiment, a parallel plane mode oscillation occurring between 5 the first printed circuit board 22 and the second printed circuit board 23 generates a sinusoidal current having a large amplitude. However, the current flowing longitll-lin~lly on the earth conductor 12b of the second printed circuit board 23 is prevented by the slit 20 and flows alongside the slit 20 in the same way as explained in the first embodiment.
Therefore, the current flowing from the earth conductor 12a on the first printed circuit 10 board 22 to the earth conductor 13 on the second printed circuit board 23 via the connector 24 is suppressed because of the narrow width of earth conductor 14.
Thus, the parallel plane mode oscillation between the battery 15 and the second printed circuit board 23 is ~u~ressed, and the current around the control circuit 7 is reduced. Also, the current between the first printed circuit board 22 and the second 15 printed circuit board 23 due to the parallel plane mode oscillation is suppressed.
Accordingly, the current amplitude which distributes along the control circuit 7 is reduced.
The first printed circuit board 22 and the second printed circuit board 23 can be multi-layered circuit boards which comprise a single surface circuit board or a double 20 surface circuit board, respectively, and the same current decreasing effect can be obtained regardless of the number of layers.
Embodiment 3.
Figure S shows a perspective view which illustrates a mobile telecommunication 25 apparatus according to a third embodiment. Figure 6 shows a plurality of separated layers which comprise a slot antenna 25.
The construction of the apparatus shown in Figures 5 and 6 is the same as that of the first embodiment of Figure 1, except for the slot antenna 25. Therefore, the detailed explanation, except for the slot antenna 25, is omitted.
30In Figure 6, the printed circuit board 5 is constructed of a multi-layered structure which includes dielectric layers 27a, 27b, and 27c sandwiched between respective copper foil pattern layers 26a, 26b, 26c, and 26d, and a plurality of through-hole platings 28 and earth conductors 30a and 30b which form slots 29a and 29b, respectively. The CA 0224692~ 1998-09-10 number of layers is defined by the number of copper foil layers. In Figure 6, the printed circuit board 5 has four copper foil layers. Therefore, the printed circuit board 5 is referred to as a four layer circuit board. The other construction details are the same as those of the first embo~im~nt7 thus, the detailed explanations thereof are omitted.
A slot ~nt~nn~ 25 is equivalent to a ~\l2 wavelength slot ~nt~nn~ folded into a U-shape. The slots 29a and 29b are arranged at the top of the earth conductors 30a and 30b, respectively. The electric length of the slots 29a and 29b is about ~/4 wavelengths at the resonance frequency. The width of the slots 29a and 29b is small enough compared to the wavelength. The earth conductors 30a and 30b having slots 29a and 10 29b, respectively, are intercomlected by through-hole platings 28. This slot antenna 25 o~ldtes as a slot antenna having about ~/2 electric wavelength at the resonance fre~uency.
Since the slot antenna 25 is formed using the earth conductors 30a and 30b on the printed circuit board 5, large ~;ulle~ flow on the earth conductor 12.
An effect of the slit 20 is explained below. Figure 7 shows calculated values oflongitu(lin~l current distribution on a printed circuit board 5 without a slit 20. Figure 8 shows calculated values of lon~itudin~l current distribution on a printed circuit board 5 with a slit 20. The vertical direction on the figure shows norm~li7ed current values on a printed circuit board 5, which is norm~li7ed by a feeder current supplied to the slot 20 ~ntenn~ 25.
As seen from Figure 7, the maximum norm~li7ed current value is 0.123 around the control circuit 7 on the printed circuit board 5 in the event that no slit 20 is provided.
Altern~tively, the maximum norm~li7ed current value is 0.031 around the control circuit 7 on the printed circuit board 5 in the event that the slit 20 is provided. In other words, 25 by providing the slit 20 on the printed circuit board 5, the current around the control circuit 7 on a printed circuit board 5 is decreased by about 12 dB.
In the same way as explained in the first embodiment, the current flowing lon~itudin~lly on the earth conductor 12 of the printed circuit board 5 is prevented by the slit 20. Therefore, the current path alongside the slit 20 is longer and the current 30 flowing through the path alongside the slit 20 is more attenuated. Also, the current flowing longitudinally along the earth conductor 14 of the printed circuit board 5 is suppressed because of the narrower width of the earth conductor 14.
CA 0224692~ 1998-09-10 Thus, the parallel plane mode oscillation between the control circuit 7 and the battery 15 is suppressed, and the current around the control circuit 7 is reduced.
Furthermore, an effect similar to that obtained for the slot antenna can also beobtained for any other ~ntenn~ such as an inverted F-type antenna equipped inside of 5 the mobile telecommunication apparatus.
Also, the printed circuit board 5 can be a multi-layered circuit board which comprises a single surface circuit board or a double surface circuit board, and the same current decreasing effect can be obtained regardless of the number of layers.
In addition, it is possible to use two circuit boards which are separately equipped 10 with the radio circuit 6 and the control circuit 7, respectively, as well as one circuit board commonly e~uipped with both radio circuit 6 and the control circuit 7 thereon.
In each case, the same current decreasing effect can be obtained.
Embodiment 4.
Figure 9 shows a perspective view which illustrates a mobile telecommunication a~al~tus according to a fourth embodiment. In Figure 9, the mobile telecommunication apparatus includes a ~/4 wavelength monopole antenna 31.
The ~/4 wavelength monopole antenna 31 preferably comprises a helical type conductor. The impedance characteristic of the ~/4 wavelength monopole antenna is 20 broadband. Also, it is easy to match the impedance with the circuits in the mobile telecommunication apparatus. The other construction details are the same as the construction details of the first embodiment, so the detailed explanation thereof is omitted.
In the same way as explained in the first embodiment, the current flowing 25 longitu(lin~lly on the earth conductor 12 of the printed circuit board 5 is prevented by the slit 20. Therefore, the current path alongside the slit 20 is longer and the current flowing along the current path is more attenuated. Also, the current flowing longitudinally along the earth conductor 14 of the printed circuit board 5 is suppressed because of the relatively narrow width of the earth conductor 14.
Thus, the parallel plane mode oscillation between the control circuit 7 and the battery 15 is suppressed, and the current around the control circuit 7 is reduced.
CA 0224692~ 1998-09-10 Furthermore, an effect similar to that obtained with the ~/4 wavelength monopoleantenna can also be obtained for any other antenna such as a straight antenna provided outside of the mobile telecommunication apparatus.
Also, the printed circuit board 5 can be a multi-layered circuit board which 5 comprises a single surface circuit board or a double surface circuit board, and the same current decreasing effect can be obtained regardless of the number of layers.
In addition, it is possible to use two circuit boards which are separately e~uipped with the radio circuit 6 and the control circuit 7, respectively, as well as one circuit board commonly equipped with both radio circuit 6 and the control circuit 7 thereon.
10 In each case, the same current decreasing effect can be obtained.
Embodiment 5.
Figure 10 shows a perspective view which illustrates a mobile telecommunication apparatus according to a fifth embodiment. In Figure 10, the mobile telecommunication apparatus includes a slot termin~ting portion 32, a ~/2 monopole ~nt~nn~ 33 excited by a slot antenna 25, and an ~ntenn~ termin~ting portion 34 of the ~\/2 monopole antenna 33. The ~/2 monopole ~ntenn~ 33, which is fixed to the body 1 of the mobile telecommunication a~t~ls, is coupled to the slot antenna 25 without contacting the printed circuit board 5.
The operation of the ~/2 monopole antenna 33 is explained below. Figure 11 shows a sectional view of the main portion of the fifth embodiment. In Figure 11, the slot termin~ting portion 32 and antenna termin~ting portion 34 are placed at a position where the electrical field is at a maximum. Therefore, the antenna termin~ting portion 34 of the )~/2 monopole antenna 33 is coupled to the slot termin~ting portion 32 of the slot antenna 25 via the electrical field. The ~/2 monopole antenna 33 is then excited via equivalent capacitance 41 between the antenna termin~ting portion 34 and the slot termin~ting portion 32. The other construction details are the same as those of the first embodiment, thus the detailed explanation thereof is omitted.
Figure 12 illustrates a slot antenna 25 which excites the ~/2 monopole antenna 30 33 equipped at the outside of the appal~tus body without contacting the ~/2 monopole ~ntenn~. Figure 12 shows calculated values of longit~1~in~l current distribution on the printed circuit board 5 without a slit 20. Figure 13 shows calculated values of CA 0224692~ 1998-09-10 longitudinal current distribution on the printed circuit board S with a slit 20 in the mobile telecommunication appa.~tus according to the fifth embodiment of the present invention.
As seen from Figure 12 and Figure 13, the maximum norm~li7ed current value is 0.116 around the control circuit 7 on the printed circuit board 5 when no slit 20 is S provided, but the maximum norm~li7~d current value is 0.012 around the control circuit 7 on the printed circuit board 5 when the slit 20 is provided. In other words, by providing the slit 20 on the printed circuit board 5, the current around the control circuit 7 on the printed circuit board 5 is decreased to about 20 dB.
In the same way as explained in the first embodiment, the current flowing 10 longitll~lin~lly on the earth conductor 12 of the printed circuit board 5 is prevented by the slit 20. Therefore, the current path alongside the slit 20 is longer and the current flowing through the path along the slit 20 is more attenuated. Also, the current flowing longitu~in~lly along the earth conductor 14 of the printed circuit board 5 is ~uppressed because of the relatively narrow width of the earth conductor 14.
Thus, the parallel plane mode oscillation between the control circuit 7 and the battery 15 is suppressed, and the current around the control circuit 7 is reduced.
Furthermore, an effect similar to that obtained with the )~/2 monopole antenna can also be obtained for any other antenna such as an inverted F-type antenna provided inside of the mobile telecommunication apparatus or a helical antenna provided outside of the 20 mobile telecommunication appaldlus.
Also, the printed circuit board S can be a multi-layered circuit board which comprises a single surface circuit board or a double surface circuit board, and the same current decreasing effect can be obtained regardless of the number of layers.
In addition, it is possible to use two circuit boards which are separately equipped 25 with the radio circuit 6 and the control circuit 7, respectively, as well as one circuit board commonly equipped with both radio circuit 6 and the control circuit 7 thereon.
In each case, the same current decreasing effect can be obtained.
Embodiment 6.
Figure 14 shows a perspective view which illustrates a mobile telecomm-lnic~tionappaldtus according to a sixth embodiment. Figure 15 shows a front view of a printed circuit board 5 equipped in the mobile telecommunication apparatus of the sixth embodiment of the present invention. In Figure 14, the mobile telecommunication ~ CA 0224692~ 1998-09-10 apparatus include a slit 35 which is formed on the printed circuit board S between the radio circuit 6 and the control circuit 7 by etching a copper foil pattern layer.
The construction of the present embodiment makes it easier to define the slit 35on the printed circuit board S between the radio circuit 6 and the control circuit 7, and S has advantages such as a large strength, compared to the machining process that defines the slit 20 as shown above. The other construction details are the same as those of the first embodiment, so the detailed explanation thereof is omitted.
In the same way as explained in the first embodiment, the current flowing longitll(lin~lly on the earth conductor 12 of the printed circuit board 5 is prevented by 10 the slit 35 which is constructed by etching of the copper foil pattern layer. Therefore, the current path alongside the slit 35 is longer and the current flowing through the path alongside the slit 35 is more attenuated. Also, the current flowing longitu~in~lly along the earth conductor 14 of the printed circuit board S is ~u~ressed because of the relatively narrow width of the earth conductor 14.
lS Thus, the parallel plane mode oscillation between the control circuit 7 and the battery lS is suppressed, and the current around the control circuit 7 is reduced. That is, the current amplitude which distributes along the control circuit 7 is reduced.
Furthermore, an effect similar to that obtained with the straight slit can also be obtained with any other slit shape, such as a curved slit.
In addition, an effect similar to that obtained with the monopole antenna is also obtained for any type of antenna.
Also, the printed circuit board S can be a multi-layered circuit board which comprises a single surface circuit board or a double surface circuit board, and the same current decreasing effect can be obtained regardless of the number of layers.
In addition, it is possible to use two circuit boards which are separately equipped with the radio circuit 6 and the control circuit 7, respectively, as well as one circuit board commonly equipped with both radio circuit 6 and the control circuit 7 thereon.
In each case, the same current decreasing effect can be obtained.
30 Embodiment 7.
Figure 16 shows spatial relationship between a printed circuit board S and a battery lS according to a seventh embodiment. In Figure 16, the printed circuit board is constructed with copper foil pattern layers 26a and 26b, and a dielectric layer 27. On . CA 0224692~ 1998-09-10 the copper foil pattern layers 26a, the earth conductors 12a and 13a form a first slit 35 which does not extend the full width, thus leaving a narrow portion 14 connecting the earth conductors 12a and 13a. On the copper foil pattern layers 26b, the earth conductors 12b and 13b form a second slit 36 which extends the full width, thus 5 separating the earth conductors 12b and 13b, without forming the narrow portion 14.
In addition, in Figure 16, the earth conductor 12a on the copper foil pattern layer 26a and the earth conductor 12b on the copper foil pattern layer 26b are interconnected by through-hole plating 28a. Similarly, the earth conductor 13a on the copper foil pattern layer 26a and the earth conductor 13b on the copper foil pattern layer 26b are 10 interconnected by through-hole plating 28b.
The slit 35 is formed on the opposite surface of the printed circuit board 5 from the battery 15. The slit 35 is formed by etching a copper foil pattern layer between the radio circuit 6 and the control circuit 7.
The slit 36 is formed on the surface of the printed circuit board 5 facing the 15 battery 15 and separates the earth conductor 12a from the earth conductor 13a.
The surface of the printed circuit board 5 facing the battery 15 generates less parallel mode oscillation because the earth conductor 12b and earth conductor 13b are separated. However, on the surface of the printed circuit board 5 opposite to the battery 15, the current flowing longitudinally on printed circuit board 5 is ~u~ressed, and the 20 parallel mode oscillation is not generated because it is not facing the battery. Therefore, the parallel mode oscillation is suppressed between the battery 15 and the control circuit 7, and the current around the control circuit 7 on a printed circuit board 5 can be further reduced.
Furthermore, an effect similar to that obtained with the straight slit can be 25 obtained with any other slit shape, such as a curved slit.
In addition, an effect similar to that obtained with the monopole ~ntenn~ is obtained with any type of antenna.
Also, the printed circuit board 5 can be a multi-layered circuit board which comprises a single surface circuit board or a double surface circuit board, and the same 30 current decreasing effect can be obtained regardless of the number of layers.In addition, it is possible to use two circuit boards which are separately equipped with the radio circuit 6 and the control circuit 7, respectively, as well as one circuit CA 0224692~ 1998-09-10 board commonly equipped with both radio circuit 6 and the control circuit 7 thereon.
In each case, the same current decreasing effect can be obtained.
Embodiment 8.
Figure 17 shows the spatial relationship between a printed circuit board 5 and the battery 15 according to an eighth embodiment. In Figure 17, the printed circuit board 5 is constructed with four layers. They are a first copper foil pattern layer 26a, a second copper foil pattern layer 26b, a third copper foil pattern layer 26c, and a fourth copper foil pattern layer 26d, respectively, which are arranged in the order of farthest from the 10 battery 15. The dielectric layers 27a, 27b, and 27c are sandwiched by the first copper foil pattern layer 26a, the second copper foil pattern layer 26b, the third copper foil pattern layer 26c, and the fourth copper foil pattern layer 26d, respectively. A copper foil pattern 37 is arranged on the earth conductor 12b on the second copper foil pattern layer 26b, and a copper foil pattern 38 is arranged on the earth conductor 13d on the 15 fourth copper foil pattern layer 26d. The copper foil pattern 37 and the copper foil pattern 38 are interconnected by through-hole plating 28 through the dielectric layer 27b, the third copper foil pattern layer 26c and the dielectric layer 27c. Thus, the earth conductor 12b and the earth conductor 13d are connected electrically. Slits 39a, 39b, 39c and 39d separate the earth conductors 12a ~d from the earth conductors 13a ~d, 20 respectively, on the copper foil pattern layers 26a, 26b, 26c and 26d, respectively.
Figure 17 shows a connection example between the earth conductors 12b on the second copper foil pattern layer 26b and the earth conductors 13d on the fourth copper foil pattern layer 26d. The inter-layer connection copper foil pattern 37 is formed on the second copper foil pattern layer 26b, and the inter-layer connection copper foil pattem 25 38 is formed on the fourth copper foil pattern layer 26d. However, if the earth conductors are connected with the other copper foil pattern layers, any inter-layer connection copper foil patterns can be arranged on any earth conductors unless the inter-layer connection copper foil pattern 37 and the inter-layer connection copper foil pattern 38 are not arranged on the same layer.
The earth conductor 12 of the radio circuit 6 or the earth conductor 13 of the control circuit are also connected via the through-hole plating 28, but they are not illustrated from the view point of the simple figure construction.
CA 0224692~ 1998-09-10 The earth conductors on the second first copper foil pattern layer 26b and the third copper foil pattern layer 26c are separated by the slits 39b and 39c, respectively, which separate the current flowing through the radio circuit 6 and the control circuit 7.
At the first copper foil pattern layer 26a and the fourth copper foil pattern layer 5 26d, that is, at the surface layers of the printed circuit board 5, the parallel plane mode oscillation is greatly reduced, because the earth conductors 12a,d and the earthconductors 13a,d are separated by the slits 39a and 39d, respectively.
Therefore, the parallel plane mode oscillation is suppressed between the battery15 and the control circuit 7, and the current around the control circuit 7 on a printed 10 circuit board 5 can be further reduced.
In Figure 17, the current flowing longitudinally on the printed circuit board 5 can be still further suppressed even in the second copper foil pattern layer 26b and the third copper foil pattern layer 26c which are inner surface layers of the printed circuit board 5. This is because the earth conductors 12b,c and the earth conductors 13b,c are15 sepal~ted by the slits 39b and 39c, respectively.
Furthermore, an effect similar to that obtained with the straight slit can also be obtained with any other slit shapes, such as a curved slit.
In addition, an effect similar to that obtained with the monopole antenna is obtained for any types of ~ntenn~.
Also, the printed circuit board 5 can be a multi-layered circuit board which comprises a single surface circuit board or a double surface circuit board, and the same current decreasing effect can be obtained regardless of the number of layers.
In addition, it is possible to use two circuit boards which are separately equipped with the radio circuit 6 and the control circuit 7, respectively, as well as one circuit 25 board commonly equipped with both radio circuit 6 and the control circuit 7 thereon.
In each case, the same current decreasing effect can be obtained.
In the case of the two circuit board construction such as shown in Figure 3, theearth conductor 12 on the first printed circuit board and the earth conductor 13 on the second printed circuit board are connected to each other by a through-hole plating.
As described above, according to the eighth embodiment of the present invention,the current can be reduced around the control circuit 7 by forming the slits 39a, 39b, 39c and 39d between the earth conductors 12a,b,c and d and the earth conductors 13a,b,c and d, respectively.
CA 0224692~ 1998-09-10 Since the current around control circuit portion 7 is reduced, the influence upon audio cil~;uitly in the control circuit 7 can be lowered, and audio interference noise can be reduced.
Since the currents flowing on the earth conductors 13a,b,c and d of the control 5 circuit on the printed circuit board 5 are reduced, the inverted-phase current acting oppositely to the antenna current is decreased. Therefore, the horizontal gain for the mobile telecommunication apparatus is improved, an improved radiation pattern isobtained, and the tr~n~mi~ion/reception range thereby increased.
The invention being thus described, it will be obvious that the same may be 10 varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included in the scope of the following claims.
BACKGROUND OF THE INVENTION
Field of the Invention S The present invention relates to a mobile telecommunication appalallls such as a portable telephone or a telephone of the kind used in Japan for the Personal Handyphone System (PHS).
Description of the Prior Art Figure 18 illustrates a conventional mobile telecommunication appa~allls shown in J~p~nese Laid-Open Patent Publication No. 7-74807, "A Portable Telephone". Figure 18 includes a body 1 of a telecommunication appa.~lus, an antenna 2, a tr~n~mitter 3, and a receiver 4.
Figure 19 is a perspective view which illustrates an internal construction of a 15 conventional mobile telecommunication appa.~lus. Figure 20 and Figure 21 are sectional views seen from a line A-B and a line C-D in Figure 19, respectively.
In Figure 19 - Figure 21, the mobile telecommunication appa.~lus includes a printed circuit board 5, a radio circuit 6 formed on the printed circuit board 5, a control circuit 7 formed on the printed circuit board 5, a voice circuit 8, shield cases 9a and 9b 20 surrounding the radio circuit 6, a feeder line 10, a feeding circuit 11, an earth conductor 12 for the radio circuit 6, an earth conductor 13 for the control circuit, an earth conductor 14 formed between the earth conductors 12 and 13, and a battery 15.
The printed circuit board 5 is actually a multi-layered circuit board. Parts constructing the radio circuit 6 and the control circuit 7 are mounted on the printed 25 circuit board 5. The voice circuit 8 is included in the control circuit 7.
The shield cases 9a and 9b are equipped to shield external noise coming into theradio circuit 6 and to prevent the escape of radiation to the outside. However, since the shield construction around the control circuit 7 is complicated, the shield construction is not generally included.
The ~ntPnn~ 2 generally uses a ~/4 monopole antenna (~ indicates a wavelength of the frequency being used) or a ~/2 monopole antenna. Impedance of a ~/4 monopole antenna is easily matched and the structure of the feeding circuit 11 is relatively simple.
The radiation characteristic of the ~/2 monopole antenna is better than the ~/4 monopole CA 0224692~ 1998-09-10 ~nteMn~ although the construction of feeding circuit 11 becomes a little bit complicated due to impedance matching. The earth conductor 12, the earth conductor 13, and the earth conductor 14 are equipped on the printed circuit board 5. The earth conductor 14 is equipped between the earth conductor 12 and the earth conductor 13, and they are 5 connected electrically.
The operation of the conventional mobile telecommunication appal~lus is explained below. During tr~n~mitting~ a human voice from a tr~n~mitter 3 is converted to a voice signal through the voice circuit 8 in the control circuit 7. The voice signal is modulated to a high frequency signal by the radio circuit 6. The modulated high 10 frequency signal is radiated from the ~ntPnn~ 2 via the feeding circuit 11.
On the other hand, during receiving, a high frequency modulated signal which enters the radio circuit 6 via the feeding circuit 11 from the antenna 2 is demodulated to a voice signal through a demodulator circuit. The demodulated voice signal istr~n~duced into an audible human voice by the receiver 4 via the voice circuit 8 in the 15 control circuit 7. Also, the battery 15 supplies power to the radio circuit 6 and the control circuit 7.
Figure 22 illustrates an example of a longitu(lin~l current distribution on the side of the printed circuit board 5 facing the battery 15 in the conventional mobile telecommunication appal~lus using a ~/4 monopole ~ntPnn~ as the antenna 2.
In Figure 22, numerals 16 and 17 indicate current amplitude and phase which distribute along the ~nt~,nn~ 2 and the radio circuit 6, respectively. Numerals 18 and 19 indicate current amplitude and phase which distribute along the control circuit 7, respectively.
Current flowing through the earth conductor 14 equipped between the radio 25 circuit 6 and the control circuit 7 is amplified by a parallel plane mode oscillation between the battery 15 and the control circuit 7 that generates a sinewave current 18 having a large amplitude.
This current having a sinewave distribution greatly influences the voice circuit 8 in the control circuit 7. This current generates noise in the voice signal which is then 30 tr~n~d-lced by the receiver 4 thereby decreasing the speech quality.
Also, the phase 19 of the current flowing along the control circuit 7 on the printed circuit board 5 is contrary to the phase 17 of current distributing between the antenna 2 and the radio circuit 6. Therefore, the ~nt~nn~ gain of the telecommunication CA 0224692~ 1998-09-10 apparatus toward the horizontal direction is extremely attenuated, which decreases the available communication distance.
SUMMARY OF THE INVENTION
It is an object of the present invention to reduce current around the control circuit on the printed circuit board and to obtain a mobile telecommunication appardtus having less background noise and good antenna radiation characteristics.
According to an aspect of the invention, a mobile telecommunication appaldlus includes a printed circuit board provided in a body of the mobile telecommunication 10 appalalus; a radio circuit including a modulator circuit and a demodulator circuit arranged on the printed circuit board; a control circuit including a voice circuit for proces~in~ a voice signal arranged on the printed circuit board; a first earth conductor for grounding the radio circuit; a second earth conductor for grounding the control circuit and being continuous with the first earth conductor; an antenna connected to the 15 radio circuit; and a slit arranged between the first earth conductor and the second earth conductor.
According to another aspect of the invention, a mobile telecommunication a~L~dlus includes first and second printed circuit boards provided in a mobile telecommunication apparatus; a radio circuit including a modulator circuit and a20 demodulator circuit arranged on the first printed circuit board; a control circuit including a voice circuit for processing a voice signal arranged on the second printed circuit board;
a first earth conductor for grounding the radio circuit on the first printed circuit board;
a second earth conductor for grounding the control circuit on the second printed circuit board; a third earth conductor on the second printed circuit board being electrically 25 connected with the second earth conductor; a connector for connecting the first earth conductor with the third earth conductor; an antenna being connected to the radio circuit;
and a slit arranged between the second earth conductor and the third earth conductor.
In one plefelled embodiment, the ~ntenn~ of the mobile telecommunication appa dlus is a slot inner antenna constructed by a ~/4 wavelength slot arranged at one 30 portion of the printed circuit board.
In another prerelled embodiment, the antenna of the mobile telecommunication apparatus is a ~/4 wavelength monopole antenna protruding outwards from the apparatus body.
CA 0224692~ 1998-09-10 The antenna of the mobile telecommunication apparatus can also be a ~/2 monopole antelllla protruding outwards from the apparatus body and which is excited from the inner ~ntenn~ by way of non-contact feeding, thereby providing a further alternative.
Preferably the slit is constructed by a pattern etching of the printed circuit board.
According to a further aspect of the invention, a mobile telecommunication appal~lus includes a printed circuit board provided in a body of the mobile telecommunication appa~t~ls; a radio circuit including a modulator circuit and ademodulator circuit arranged on the printed circuit board; a control circuit including a 10 voice circuit for processing a voice signal arranged on the printed circuit board; a first earth conductor formed on a first surface of the printed circuit board for grounding the radio circuit; a second earth conductor formed on a second surface of the printed circuit board for grounding the control circuit; a third earth conductor located on the second surface of the printed circuit board at a corresponding location facing the first earth 15 conductor and being electrically connected with the second earth conductor; a fourth earth conductor located on the first surface of the printed circuit board at a corresponding location facing the second earth conductor; a battery facing the fourth earth conductor;
an ~nt~nn~ connected to the radio circuit; and a first slit for electrically separatillg the first earth conductor and the fourth earth conductor; and a second slit arranged between 20 the second earth conductor and the third earth conductor.
According to a further aspect of the invention, a mobile telecommunication appa,~us includes a printed circuit board provided in a body of the mobile telecommunication apparatus; a radio circuit including a modulator circuit and ademodulator circuit arranged on the printed circuit board; a control circuit including a 25 voice circuit for processing a voice signal arranged on the printed circuit board; a first earth conductor formed on a first surface of the printed circuit board for grounding the radio circuit; a second earth conductor formed on a second surface of the printed circuit board for grounding the control circuit; a third earth conductor located on the second surface of the printed circuit board at a corresponding location facing the first 30 earth conductor for grounding the radio circuit; a fourth earth conductor located on the first surface of the printed circuit board at a cull~s~onding location facing the second earth conductor for grounding the conkol circuit; a battery being placed facing the fourth earth conductor; an antenna connected to the radio circuit; and a first slit for eleckically CA 0224692~ 1998-09-10 separating the first earth conductor and the fourth earth conductor; and a second slit for electrically separating the second earth conductor and the third earth conductor.
According to a further aspect of the invention, a mobile telecommunication appafat~ls includes a multi-layered printed circuit board equipped in a body of the mobile S telecommunication appald~us, the multi-layer includes a plurality of earth conductors and dielectric boards interl~ved between the ea~th conductors; each of the earth conductors including a first earth conductor for grounding a radio circuit and a second earth conductor for grounding the control circuit; a slit for electrically separating the first earth conductor and the second earth conductor; and a battery facing the second earth 10 conductors; wherein the first earth conductor on any surface of the dielectric boards is connected by through-hole plating to the second earth conductor on another surface of the dielectric boards through another of the earth conductors and another of the dielectric boards.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description given herein below and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
Figure 1 is a perspective view which illustrates an int~rn~l construction of a mobile telecommunication appa,~lus of a first embodiment of the present invention;
Figure 2 is a diagram showing one example of the current on the printed circuit board of the first embodiment of the present invention;
Figure 3 is a perspective view which illustrates a mobile telecommunication 25 apparatus of the second embodiment of the present invention;
Figure 4 is a side sectional diagram which illustrates a mobile telecommunication a~l)al~lus of the second embodiment of the present invention;
Figure S is a perspective view which illustrates a mobile telecommunication a~al~tus of the third embodiment of the present invention;
Figure 6 is a diagram showing each separated layer to show a slot antenna of thethird embodiment of the present invention;
Figure 7 is a diagram showing calculated values of longitudinal current distribution on the printed circuit board without a slit;
CA 0224692~ 1998-09-10 Figure 8 is a diagram showing calculated values of longitutlin~l current distribution on the printed circuit board with a slit in the third embodiment of the present invention;
Figure 9 is a perspective view showing a structural overview of a mobile 5 telecommunication a~pal~lus of the fourth embodiment of the present invention;Figure 10 is a perspective view showing a mobile telecommunication appal~us of a fifth embodiment of the present invention;
Figure 11 is a side sectional diagram to explain the operation principle of a mobile telecommunication appal~lus of the fifth embodiment of the present invention;
Figure 12 is a diagram showing calculated values of lonp~itu-lin~l current distribution on a printed circuit board without a slit in a mobile telecommunication apparatus having a non-contact antenna, which excites a )~/2 monopole antenna protruding towards from outside of the a~al~tus body;
Figure 13 is a diagram showing calculated values of lon~itu-lin~l current 15 distribution on a printed circuit board with a slit in a mobile communication of the fifth embodiment of the present invention;
Figure 14 is a perspective view showing a mobile telecommunication apparatus of a sixth embodiment of the present invention;
Figure 15 is a front view showing a printed circuit board provided in a mobile 20 telecommunication appaiatus of the sixth embodiment of the present invention;Figure 16 is a diagram showing a spatial relationship between a printed circuit board and a battery which are included in a mobile telecommunication apparatus of the seventh embodiment of the present invention;
Figure 17 is a diagram showing a spatial relationship between a printed circuit 25 board and a battery which are included in a mobile telecommunication a~p~dlus of an eighth embodiment of the present invention;
Figure 18 illustrates a conventional mobile telecommunication apparatus;
Figure 19 is a perspective view which illustrates an internal construction of a conventional mobile telecommunication appal~us;
Figure 20 and Figure 21 are sectional views seen from a line A-B and a line C-D
in Figure 19, respectively; and ~ CA 0224692~ 1998-09-10 Figure 22 illustrates an example of a longit~ltlin~l current distribution on theprinted circuit board facing a battery in the conventional mobile telecommunication appa~atus which uses a ~/4 monopole antenna.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Further scope of applicability of the present invention will become a~pa~e lt from the detadiled description given hereinafter. However, it should be understood that the det~iled description and specific examples, while indicating prefelled embodiments of 10 the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become al)parel-t to those skilled in the art from this detailed description.
Embodiment 1.
A first embodiment of the present invention is explained below. Figure 1 is a perspective view which illustrates an internal construction of a mobile telecommunication appa dtus of a first embodiment of the present invention.
A telecommunication appaldt~ls shown in Figures 1 and 2 includes a body 1 of, an antenna 2, a tr~n~mitt~r 3, a receiver 4, a printed circuit board 5, a radio circuit 6 20 formed in the printed circuit board 5, a control circuit 7 formed in the printed circuit board 5, a voice circuit 8, shield cases 9a and 9b surrounding the radio circuit 6, a feeder line 10, a feeding circuit 11, an earth conductor 12 for the radio circuit 6, an earth conductor 13 for the control circuit, an earth conductor 14 formed between the earth conductors 12 and 13, and a battery 15.
A slit 20 is notched between the radio circuit 6 and the control circuit 7 on the printed circuit board 5. The slit 20 does not extend the full width, leaving a narrow earth conductor 14 which connects the earth conductor 12 and the earth conductor 13.
The earth conductor 12 is referred to as a first earth conductor and the earth conductor 13 is referred to as a second earth conductor. The respective first earth conductors 12 30 and the second earth conductors 13 are part of the printed circuit board 5, and they are electrically connected via the earth conductor 14.
CA 0224692~ 1998-09-10 Figure 2 illustrates an example of currents flowing on the printed circuit board5. In Figure 2, arrows 21a - 21g replesellt the directions of current flowing on the earth conductor of printed circuit board 5.
The current 21b flowing longitu~in~lly on the earth conductor 12 of the printed 5 circuit board 5 is prevented by the slit 20 and flows alongside the slit 20 like the current 21c. Therefore, the current path alongside the slit 20 is longer and the current flowing through the path alongside the slit 20 is more attenuated. Also, the current 21d flowing longitu-lin~lly along the earth conductor 14 of the printed circuit board 5 is suppressed because of the narrower width of the earth conductor 14.
Thus, the parallel plane mode oscillation between the control circuit 7 and the battery 15 shown in Figure 22 is ~lppl~;ssed, and the current 21e- 21f around the control circuit 7 is re~uced. That is, the current amplitude which distributes along the control circuit 7 is reduced.
The printed circuit board 5 can be a multi-layered circuit board which comprises15 a single surface circuit board or a double surface circuit board, and the same current decreasing effect can be obtained regardless of the number of layers.
Embodiment 2.
Figure 3 shows a perspective view which illustrates a mobile telecommunication 20 appaldl~ls according to a second embodiment. Figure 4 is a sectional diagram of the mobile telecommunication apparatus depicted in Figure 3.
In Figure 3 and Figure 4, the mobile telecommunication appaldl~ls includes a first printed circuit board 22 equipped with a radio circuit 6 and a feeding circuit 11, a second printed circuit board 23 is equipped with a control circuit 7, shield cases 9a and 25 9b surrounding the radio circuit 6 and the feeding circuit 11, and a connector 24 for connecting the first printed circuit board 22 with the second printed circuit bodrd 23.
In this second embodiment, the antenna 2 is connected to the feeding circuit 11 on the edge of the first printed circuit board 22.
The slit 20 is arranged between the first earth conductor 12a, where the radio 30 circuit 6 is provided and the second earth conductor 13, where the control circuit 7 is provided. The lower portion of the third earth conductor 12b on the second printed circuit board 23 is connected to the first earth conductor 12a via the connector 24.
CA 0224692~ 1998-09-10 The slit 20 forms a narrow earth conductor 14 which connects the third earth conductor 12b and the second earth conductor 13. Other construction details of the second embodiment are the same as those of the first embodiment.
In the second embodiment, a parallel plane mode oscillation occurring between 5 the first printed circuit board 22 and the second printed circuit board 23 generates a sinusoidal current having a large amplitude. However, the current flowing longitll-lin~lly on the earth conductor 12b of the second printed circuit board 23 is prevented by the slit 20 and flows alongside the slit 20 in the same way as explained in the first embodiment.
Therefore, the current flowing from the earth conductor 12a on the first printed circuit 10 board 22 to the earth conductor 13 on the second printed circuit board 23 via the connector 24 is suppressed because of the narrow width of earth conductor 14.
Thus, the parallel plane mode oscillation between the battery 15 and the second printed circuit board 23 is ~u~ressed, and the current around the control circuit 7 is reduced. Also, the current between the first printed circuit board 22 and the second 15 printed circuit board 23 due to the parallel plane mode oscillation is suppressed.
Accordingly, the current amplitude which distributes along the control circuit 7 is reduced.
The first printed circuit board 22 and the second printed circuit board 23 can be multi-layered circuit boards which comprise a single surface circuit board or a double 20 surface circuit board, respectively, and the same current decreasing effect can be obtained regardless of the number of layers.
Embodiment 3.
Figure S shows a perspective view which illustrates a mobile telecommunication 25 apparatus according to a third embodiment. Figure 6 shows a plurality of separated layers which comprise a slot antenna 25.
The construction of the apparatus shown in Figures 5 and 6 is the same as that of the first embodiment of Figure 1, except for the slot antenna 25. Therefore, the detailed explanation, except for the slot antenna 25, is omitted.
30In Figure 6, the printed circuit board 5 is constructed of a multi-layered structure which includes dielectric layers 27a, 27b, and 27c sandwiched between respective copper foil pattern layers 26a, 26b, 26c, and 26d, and a plurality of through-hole platings 28 and earth conductors 30a and 30b which form slots 29a and 29b, respectively. The CA 0224692~ 1998-09-10 number of layers is defined by the number of copper foil layers. In Figure 6, the printed circuit board 5 has four copper foil layers. Therefore, the printed circuit board 5 is referred to as a four layer circuit board. The other construction details are the same as those of the first embo~im~nt7 thus, the detailed explanations thereof are omitted.
A slot ~nt~nn~ 25 is equivalent to a ~\l2 wavelength slot ~nt~nn~ folded into a U-shape. The slots 29a and 29b are arranged at the top of the earth conductors 30a and 30b, respectively. The electric length of the slots 29a and 29b is about ~/4 wavelengths at the resonance frequency. The width of the slots 29a and 29b is small enough compared to the wavelength. The earth conductors 30a and 30b having slots 29a and 10 29b, respectively, are intercomlected by through-hole platings 28. This slot antenna 25 o~ldtes as a slot antenna having about ~/2 electric wavelength at the resonance fre~uency.
Since the slot antenna 25 is formed using the earth conductors 30a and 30b on the printed circuit board 5, large ~;ulle~ flow on the earth conductor 12.
An effect of the slit 20 is explained below. Figure 7 shows calculated values oflongitu(lin~l current distribution on a printed circuit board 5 without a slit 20. Figure 8 shows calculated values of lon~itudin~l current distribution on a printed circuit board 5 with a slit 20. The vertical direction on the figure shows norm~li7ed current values on a printed circuit board 5, which is norm~li7ed by a feeder current supplied to the slot 20 ~ntenn~ 25.
As seen from Figure 7, the maximum norm~li7ed current value is 0.123 around the control circuit 7 on the printed circuit board 5 in the event that no slit 20 is provided.
Altern~tively, the maximum norm~li7ed current value is 0.031 around the control circuit 7 on the printed circuit board 5 in the event that the slit 20 is provided. In other words, 25 by providing the slit 20 on the printed circuit board 5, the current around the control circuit 7 on a printed circuit board 5 is decreased by about 12 dB.
In the same way as explained in the first embodiment, the current flowing lon~itudin~lly on the earth conductor 12 of the printed circuit board 5 is prevented by the slit 20. Therefore, the current path alongside the slit 20 is longer and the current 30 flowing through the path alongside the slit 20 is more attenuated. Also, the current flowing longitudinally along the earth conductor 14 of the printed circuit board 5 is suppressed because of the narrower width of the earth conductor 14.
CA 0224692~ 1998-09-10 Thus, the parallel plane mode oscillation between the control circuit 7 and the battery 15 is suppressed, and the current around the control circuit 7 is reduced.
Furthermore, an effect similar to that obtained for the slot antenna can also beobtained for any other ~ntenn~ such as an inverted F-type antenna equipped inside of 5 the mobile telecommunication apparatus.
Also, the printed circuit board 5 can be a multi-layered circuit board which comprises a single surface circuit board or a double surface circuit board, and the same current decreasing effect can be obtained regardless of the number of layers.
In addition, it is possible to use two circuit boards which are separately equipped 10 with the radio circuit 6 and the control circuit 7, respectively, as well as one circuit board commonly e~uipped with both radio circuit 6 and the control circuit 7 thereon.
In each case, the same current decreasing effect can be obtained.
Embodiment 4.
Figure 9 shows a perspective view which illustrates a mobile telecommunication a~al~tus according to a fourth embodiment. In Figure 9, the mobile telecommunication apparatus includes a ~/4 wavelength monopole antenna 31.
The ~/4 wavelength monopole antenna 31 preferably comprises a helical type conductor. The impedance characteristic of the ~/4 wavelength monopole antenna is 20 broadband. Also, it is easy to match the impedance with the circuits in the mobile telecommunication apparatus. The other construction details are the same as the construction details of the first embodiment, so the detailed explanation thereof is omitted.
In the same way as explained in the first embodiment, the current flowing 25 longitu(lin~lly on the earth conductor 12 of the printed circuit board 5 is prevented by the slit 20. Therefore, the current path alongside the slit 20 is longer and the current flowing along the current path is more attenuated. Also, the current flowing longitudinally along the earth conductor 14 of the printed circuit board 5 is suppressed because of the relatively narrow width of the earth conductor 14.
Thus, the parallel plane mode oscillation between the control circuit 7 and the battery 15 is suppressed, and the current around the control circuit 7 is reduced.
CA 0224692~ 1998-09-10 Furthermore, an effect similar to that obtained with the ~/4 wavelength monopoleantenna can also be obtained for any other antenna such as a straight antenna provided outside of the mobile telecommunication apparatus.
Also, the printed circuit board 5 can be a multi-layered circuit board which 5 comprises a single surface circuit board or a double surface circuit board, and the same current decreasing effect can be obtained regardless of the number of layers.
In addition, it is possible to use two circuit boards which are separately e~uipped with the radio circuit 6 and the control circuit 7, respectively, as well as one circuit board commonly equipped with both radio circuit 6 and the control circuit 7 thereon.
10 In each case, the same current decreasing effect can be obtained.
Embodiment 5.
Figure 10 shows a perspective view which illustrates a mobile telecommunication apparatus according to a fifth embodiment. In Figure 10, the mobile telecommunication apparatus includes a slot termin~ting portion 32, a ~/2 monopole ~nt~nn~ 33 excited by a slot antenna 25, and an ~ntenn~ termin~ting portion 34 of the ~\/2 monopole antenna 33. The ~/2 monopole ~ntenn~ 33, which is fixed to the body 1 of the mobile telecommunication a~t~ls, is coupled to the slot antenna 25 without contacting the printed circuit board 5.
The operation of the ~/2 monopole antenna 33 is explained below. Figure 11 shows a sectional view of the main portion of the fifth embodiment. In Figure 11, the slot termin~ting portion 32 and antenna termin~ting portion 34 are placed at a position where the electrical field is at a maximum. Therefore, the antenna termin~ting portion 34 of the )~/2 monopole antenna 33 is coupled to the slot termin~ting portion 32 of the slot antenna 25 via the electrical field. The ~/2 monopole antenna 33 is then excited via equivalent capacitance 41 between the antenna termin~ting portion 34 and the slot termin~ting portion 32. The other construction details are the same as those of the first embodiment, thus the detailed explanation thereof is omitted.
Figure 12 illustrates a slot antenna 25 which excites the ~/2 monopole antenna 30 33 equipped at the outside of the appal~tus body without contacting the ~/2 monopole ~ntenn~. Figure 12 shows calculated values of longit~1~in~l current distribution on the printed circuit board 5 without a slit 20. Figure 13 shows calculated values of CA 0224692~ 1998-09-10 longitudinal current distribution on the printed circuit board S with a slit 20 in the mobile telecommunication appa.~tus according to the fifth embodiment of the present invention.
As seen from Figure 12 and Figure 13, the maximum norm~li7ed current value is 0.116 around the control circuit 7 on the printed circuit board 5 when no slit 20 is S provided, but the maximum norm~li7~d current value is 0.012 around the control circuit 7 on the printed circuit board 5 when the slit 20 is provided. In other words, by providing the slit 20 on the printed circuit board 5, the current around the control circuit 7 on the printed circuit board 5 is decreased to about 20 dB.
In the same way as explained in the first embodiment, the current flowing 10 longitll~lin~lly on the earth conductor 12 of the printed circuit board 5 is prevented by the slit 20. Therefore, the current path alongside the slit 20 is longer and the current flowing through the path along the slit 20 is more attenuated. Also, the current flowing longitu~in~lly along the earth conductor 14 of the printed circuit board 5 is ~uppressed because of the relatively narrow width of the earth conductor 14.
Thus, the parallel plane mode oscillation between the control circuit 7 and the battery 15 is suppressed, and the current around the control circuit 7 is reduced.
Furthermore, an effect similar to that obtained with the )~/2 monopole antenna can also be obtained for any other antenna such as an inverted F-type antenna provided inside of the mobile telecommunication apparatus or a helical antenna provided outside of the 20 mobile telecommunication appaldlus.
Also, the printed circuit board S can be a multi-layered circuit board which comprises a single surface circuit board or a double surface circuit board, and the same current decreasing effect can be obtained regardless of the number of layers.
In addition, it is possible to use two circuit boards which are separately equipped 25 with the radio circuit 6 and the control circuit 7, respectively, as well as one circuit board commonly equipped with both radio circuit 6 and the control circuit 7 thereon.
In each case, the same current decreasing effect can be obtained.
Embodiment 6.
Figure 14 shows a perspective view which illustrates a mobile telecomm-lnic~tionappaldtus according to a sixth embodiment. Figure 15 shows a front view of a printed circuit board 5 equipped in the mobile telecommunication apparatus of the sixth embodiment of the present invention. In Figure 14, the mobile telecommunication ~ CA 0224692~ 1998-09-10 apparatus include a slit 35 which is formed on the printed circuit board S between the radio circuit 6 and the control circuit 7 by etching a copper foil pattern layer.
The construction of the present embodiment makes it easier to define the slit 35on the printed circuit board S between the radio circuit 6 and the control circuit 7, and S has advantages such as a large strength, compared to the machining process that defines the slit 20 as shown above. The other construction details are the same as those of the first embodiment, so the detailed explanation thereof is omitted.
In the same way as explained in the first embodiment, the current flowing longitll(lin~lly on the earth conductor 12 of the printed circuit board 5 is prevented by 10 the slit 35 which is constructed by etching of the copper foil pattern layer. Therefore, the current path alongside the slit 35 is longer and the current flowing through the path alongside the slit 35 is more attenuated. Also, the current flowing longitu~in~lly along the earth conductor 14 of the printed circuit board S is ~u~ressed because of the relatively narrow width of the earth conductor 14.
lS Thus, the parallel plane mode oscillation between the control circuit 7 and the battery lS is suppressed, and the current around the control circuit 7 is reduced. That is, the current amplitude which distributes along the control circuit 7 is reduced.
Furthermore, an effect similar to that obtained with the straight slit can also be obtained with any other slit shape, such as a curved slit.
In addition, an effect similar to that obtained with the monopole antenna is also obtained for any type of antenna.
Also, the printed circuit board S can be a multi-layered circuit board which comprises a single surface circuit board or a double surface circuit board, and the same current decreasing effect can be obtained regardless of the number of layers.
In addition, it is possible to use two circuit boards which are separately equipped with the radio circuit 6 and the control circuit 7, respectively, as well as one circuit board commonly equipped with both radio circuit 6 and the control circuit 7 thereon.
In each case, the same current decreasing effect can be obtained.
30 Embodiment 7.
Figure 16 shows spatial relationship between a printed circuit board S and a battery lS according to a seventh embodiment. In Figure 16, the printed circuit board is constructed with copper foil pattern layers 26a and 26b, and a dielectric layer 27. On . CA 0224692~ 1998-09-10 the copper foil pattern layers 26a, the earth conductors 12a and 13a form a first slit 35 which does not extend the full width, thus leaving a narrow portion 14 connecting the earth conductors 12a and 13a. On the copper foil pattern layers 26b, the earth conductors 12b and 13b form a second slit 36 which extends the full width, thus 5 separating the earth conductors 12b and 13b, without forming the narrow portion 14.
In addition, in Figure 16, the earth conductor 12a on the copper foil pattern layer 26a and the earth conductor 12b on the copper foil pattern layer 26b are interconnected by through-hole plating 28a. Similarly, the earth conductor 13a on the copper foil pattern layer 26a and the earth conductor 13b on the copper foil pattern layer 26b are 10 interconnected by through-hole plating 28b.
The slit 35 is formed on the opposite surface of the printed circuit board 5 from the battery 15. The slit 35 is formed by etching a copper foil pattern layer between the radio circuit 6 and the control circuit 7.
The slit 36 is formed on the surface of the printed circuit board 5 facing the 15 battery 15 and separates the earth conductor 12a from the earth conductor 13a.
The surface of the printed circuit board 5 facing the battery 15 generates less parallel mode oscillation because the earth conductor 12b and earth conductor 13b are separated. However, on the surface of the printed circuit board 5 opposite to the battery 15, the current flowing longitudinally on printed circuit board 5 is ~u~ressed, and the 20 parallel mode oscillation is not generated because it is not facing the battery. Therefore, the parallel mode oscillation is suppressed between the battery 15 and the control circuit 7, and the current around the control circuit 7 on a printed circuit board 5 can be further reduced.
Furthermore, an effect similar to that obtained with the straight slit can be 25 obtained with any other slit shape, such as a curved slit.
In addition, an effect similar to that obtained with the monopole ~ntenn~ is obtained with any type of antenna.
Also, the printed circuit board 5 can be a multi-layered circuit board which comprises a single surface circuit board or a double surface circuit board, and the same 30 current decreasing effect can be obtained regardless of the number of layers.In addition, it is possible to use two circuit boards which are separately equipped with the radio circuit 6 and the control circuit 7, respectively, as well as one circuit CA 0224692~ 1998-09-10 board commonly equipped with both radio circuit 6 and the control circuit 7 thereon.
In each case, the same current decreasing effect can be obtained.
Embodiment 8.
Figure 17 shows the spatial relationship between a printed circuit board 5 and the battery 15 according to an eighth embodiment. In Figure 17, the printed circuit board 5 is constructed with four layers. They are a first copper foil pattern layer 26a, a second copper foil pattern layer 26b, a third copper foil pattern layer 26c, and a fourth copper foil pattern layer 26d, respectively, which are arranged in the order of farthest from the 10 battery 15. The dielectric layers 27a, 27b, and 27c are sandwiched by the first copper foil pattern layer 26a, the second copper foil pattern layer 26b, the third copper foil pattern layer 26c, and the fourth copper foil pattern layer 26d, respectively. A copper foil pattern 37 is arranged on the earth conductor 12b on the second copper foil pattern layer 26b, and a copper foil pattern 38 is arranged on the earth conductor 13d on the 15 fourth copper foil pattern layer 26d. The copper foil pattern 37 and the copper foil pattern 38 are interconnected by through-hole plating 28 through the dielectric layer 27b, the third copper foil pattern layer 26c and the dielectric layer 27c. Thus, the earth conductor 12b and the earth conductor 13d are connected electrically. Slits 39a, 39b, 39c and 39d separate the earth conductors 12a ~d from the earth conductors 13a ~d, 20 respectively, on the copper foil pattern layers 26a, 26b, 26c and 26d, respectively.
Figure 17 shows a connection example between the earth conductors 12b on the second copper foil pattern layer 26b and the earth conductors 13d on the fourth copper foil pattern layer 26d. The inter-layer connection copper foil pattern 37 is formed on the second copper foil pattern layer 26b, and the inter-layer connection copper foil pattem 25 38 is formed on the fourth copper foil pattern layer 26d. However, if the earth conductors are connected with the other copper foil pattern layers, any inter-layer connection copper foil patterns can be arranged on any earth conductors unless the inter-layer connection copper foil pattern 37 and the inter-layer connection copper foil pattern 38 are not arranged on the same layer.
The earth conductor 12 of the radio circuit 6 or the earth conductor 13 of the control circuit are also connected via the through-hole plating 28, but they are not illustrated from the view point of the simple figure construction.
CA 0224692~ 1998-09-10 The earth conductors on the second first copper foil pattern layer 26b and the third copper foil pattern layer 26c are separated by the slits 39b and 39c, respectively, which separate the current flowing through the radio circuit 6 and the control circuit 7.
At the first copper foil pattern layer 26a and the fourth copper foil pattern layer 5 26d, that is, at the surface layers of the printed circuit board 5, the parallel plane mode oscillation is greatly reduced, because the earth conductors 12a,d and the earthconductors 13a,d are separated by the slits 39a and 39d, respectively.
Therefore, the parallel plane mode oscillation is suppressed between the battery15 and the control circuit 7, and the current around the control circuit 7 on a printed 10 circuit board 5 can be further reduced.
In Figure 17, the current flowing longitudinally on the printed circuit board 5 can be still further suppressed even in the second copper foil pattern layer 26b and the third copper foil pattern layer 26c which are inner surface layers of the printed circuit board 5. This is because the earth conductors 12b,c and the earth conductors 13b,c are15 sepal~ted by the slits 39b and 39c, respectively.
Furthermore, an effect similar to that obtained with the straight slit can also be obtained with any other slit shapes, such as a curved slit.
In addition, an effect similar to that obtained with the monopole antenna is obtained for any types of ~ntenn~.
Also, the printed circuit board 5 can be a multi-layered circuit board which comprises a single surface circuit board or a double surface circuit board, and the same current decreasing effect can be obtained regardless of the number of layers.
In addition, it is possible to use two circuit boards which are separately equipped with the radio circuit 6 and the control circuit 7, respectively, as well as one circuit 25 board commonly equipped with both radio circuit 6 and the control circuit 7 thereon.
In each case, the same current decreasing effect can be obtained.
In the case of the two circuit board construction such as shown in Figure 3, theearth conductor 12 on the first printed circuit board and the earth conductor 13 on the second printed circuit board are connected to each other by a through-hole plating.
As described above, according to the eighth embodiment of the present invention,the current can be reduced around the control circuit 7 by forming the slits 39a, 39b, 39c and 39d between the earth conductors 12a,b,c and d and the earth conductors 13a,b,c and d, respectively.
CA 0224692~ 1998-09-10 Since the current around control circuit portion 7 is reduced, the influence upon audio cil~;uitly in the control circuit 7 can be lowered, and audio interference noise can be reduced.
Since the currents flowing on the earth conductors 13a,b,c and d of the control 5 circuit on the printed circuit board 5 are reduced, the inverted-phase current acting oppositely to the antenna current is decreased. Therefore, the horizontal gain for the mobile telecommunication apparatus is improved, an improved radiation pattern isobtained, and the tr~n~mi~ion/reception range thereby increased.
The invention being thus described, it will be obvious that the same may be 10 varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included in the scope of the following claims.
Claims (20)
1. A mobile telecommunication apparatus comprising:
a printed circuit board located in a body of the mobile telecommunication apparatus;
a radio circuit including a modulator circuit and a demodulator circuit arrangedon the printed circuit board;
a control circuit including a voice circuit for processing a voice signal arranged on the printed circuit board;
a first earth conductor for grounding the radio circuit;
a second earth conductor for grounding the control circuit and being continuous with the first earth conductor;
an antenna connected to the radio circuit; and a slit arranged between the first earth conductor and the second earth conductor.
a printed circuit board located in a body of the mobile telecommunication apparatus;
a radio circuit including a modulator circuit and a demodulator circuit arrangedon the printed circuit board;
a control circuit including a voice circuit for processing a voice signal arranged on the printed circuit board;
a first earth conductor for grounding the radio circuit;
a second earth conductor for grounding the control circuit and being continuous with the first earth conductor;
an antenna connected to the radio circuit; and a slit arranged between the first earth conductor and the second earth conductor.
2. A mobile telecommunication apparatus comprising:
a first printed circuit board located in the mobile telecommunication apparatus;a second printed circuit board located in the mobile telecommunication apparatus;
a radio circuit including a modulator circuit and a demodulator circuit arrangedon the first printed circuit board;
a control circuit including a voice circuit for processing a voice signal arranged on the second printed circuit board;
a first earth conductor for grounding the radio circuit on the first printed circuit board;
a second earth conductor for grounding the control circuit on the second printedcircuit board;
a third earth conductor on the second printed circuit board and electrically connected with the second earth conductor;
a connector connecting the first earth conductor with the third earth conductor;an antenna connected to the radio circuit; and a slit arranged between the second earth conductor and the third earth conductor.
a first printed circuit board located in the mobile telecommunication apparatus;a second printed circuit board located in the mobile telecommunication apparatus;
a radio circuit including a modulator circuit and a demodulator circuit arrangedon the first printed circuit board;
a control circuit including a voice circuit for processing a voice signal arranged on the second printed circuit board;
a first earth conductor for grounding the radio circuit on the first printed circuit board;
a second earth conductor for grounding the control circuit on the second printedcircuit board;
a third earth conductor on the second printed circuit board and electrically connected with the second earth conductor;
a connector connecting the first earth conductor with the third earth conductor;an antenna connected to the radio circuit; and a slit arranged between the second earth conductor and the third earth conductor.
3. A mobile telecommunication apparatus according to claim 1, wherein said antenna is included in the body of the mobile telecommunication apparatus.
4. A mobile telecommunication apparatus according to claim 2, wherein said antenna is included in a body of the mobile telecommunication apparatus.
5. A mobile telecommunication apparatus according to claim 3, wherein said antenna comprises an internal .lambda./2 wavelength slot antenna comprising a .lambda./4 wavelength slot arranged in one portion of the printed circuit board.
6. A mobile telecommunication apparatus according to claim 4, wherein said antenna comprises an internal .lambda./2 wavelength slot antenna comprising a .lambda./4 wavelength slot arranged in one portion of the printed circuit board.
7. A mobile telecommunication apparatus according to claim 1, wherein said antenna is a .lambda./4 wavelength monopole antenna protruding outwards from the body of the mobile telecommunication apparatus.
8. A mobile telecommunication apparatus according to claim 2, wherein said antenna is a .lambda./4 wavelength monopole antenna protruding outwards from the body of the mobile telecommunication apparatus.
9. A mobile telecommunication apparatus according to claim 1, further comprising an external antenna comprising a .lambda./2 monopole antenna protruding outwards from the body of the mobile telecommunication apparatus, the first-mentioned antenna being internal and said external antenna being excited by the first-mentioned antenna by way of non-contact feeding.
10. A mobile telecommunication apparatus according to claim 2, wherein said antenna excites by way of non-contact feeding a .lambda./2 monopole antenna protruding outwards from the apparatus body.
11. A mobile telecommunication apparatus according to claim 1, wherein said slit is formed by pattern etching of the printed circuit board.
12. A mobile telecommunication apparatus according to claim 2, wherein said slit is formed by pattern etching of the first and second printed circuit boards.
13. A mobile telecommunication apparatus comprising:
a printed circuit board located in a body of the mobile telecommunication apparatus;
a radio circuit including a modulator circuit and a demodulator circuit arrangedon the printed circuit board;
a control circuit including a voice circuit for processing a voice signal arranged on the printed circuit board;
a first earth conductor formed on a first surface of the printed circuit board for grounding the radio circuit;
a second earth conductor formed on a second surface of the printed circuit boardfor grounding the control circuit;
a third earth conductor located on the second surface of the printed circuit board at a corresponding location facing the first earth conductor and being electrically connected with the second earth conductor;
a fourth earth conductor located on the first surface of the printed circuit board at a corresponding location facing the second earth conductor;
a battery facing the fourth earth conductor;
an antenna connected to the radio circuit;
a first slit for electrically separating the first earth conductor and the fourth earth conductor; and a second slit arranged between the second earth conductor and the third earth conductor.
a printed circuit board located in a body of the mobile telecommunication apparatus;
a radio circuit including a modulator circuit and a demodulator circuit arrangedon the printed circuit board;
a control circuit including a voice circuit for processing a voice signal arranged on the printed circuit board;
a first earth conductor formed on a first surface of the printed circuit board for grounding the radio circuit;
a second earth conductor formed on a second surface of the printed circuit boardfor grounding the control circuit;
a third earth conductor located on the second surface of the printed circuit board at a corresponding location facing the first earth conductor and being electrically connected with the second earth conductor;
a fourth earth conductor located on the first surface of the printed circuit board at a corresponding location facing the second earth conductor;
a battery facing the fourth earth conductor;
an antenna connected to the radio circuit;
a first slit for electrically separating the first earth conductor and the fourth earth conductor; and a second slit arranged between the second earth conductor and the third earth conductor.
14. A mobile telecommunication apparatus according to claim 13, wherein said antenna is included in the body of the mobile telecommunication apparatus.
15. A mobile telecommunication apparatus according to claim 14, wherein said antenna comprises an internal .lambda./2 wavelength slot antenna comprising a .lambda./4 wavelength slot arranged in one portion of the printed circuit board.
16. A mobile telecommunication apparatus according to claim 13, wherein said antenna is a .lambda./4 wavelength monopole antenna protruding outwards from the apparatus body.
17. A mobile telecommunication apparatus according to claim 13, further comprising an external antenna comprising a .lambda./2 monopole antenna protruding outwards from the apparatus body, the first-mentioned antenna being an internal antenna and the external antenna being excited by the internal antenna by way of non-contact feeding.
18. A mobile telecommunication apparatus according to claim 13, wherein said slit is constructed by pattern etching of the printed circuit board.
19. A mobile telecommunication apparatus comprising:
a printed circuit board provided in a body of the mobile telecommunication apparatus;
a radio circuit including a modulator circuit and a demodulator circuit arrangedon the printed circuit board;
a control circuit including a voice circuit for processing a voice signal arranged on the printed circuit board;
a first earth conductor formed on a first surface of the printed circuit board for grounding the radio circuit;
a second earth conductor formed on a second surface of the printed circuit boardfor grounding the control circuit;
a third earth conductor located on the second surface of the printed circuit board at a corresponding location facing the first earth conductor for grounding the radio circuit;
a fourth earth conductor located on the first surface of the printed circuit board at a corresponding location facing the second earth conductor for grounding the control circuit;
a battery facing the fourth earth conductor;
an antenna connected to the radio circuit;
a first slit between the first earth conductor and the fourth earth conductor; and a second slit for electrically separating the second earth conductor and the third earth conductor.
a printed circuit board provided in a body of the mobile telecommunication apparatus;
a radio circuit including a modulator circuit and a demodulator circuit arrangedon the printed circuit board;
a control circuit including a voice circuit for processing a voice signal arranged on the printed circuit board;
a first earth conductor formed on a first surface of the printed circuit board for grounding the radio circuit;
a second earth conductor formed on a second surface of the printed circuit boardfor grounding the control circuit;
a third earth conductor located on the second surface of the printed circuit board at a corresponding location facing the first earth conductor for grounding the radio circuit;
a fourth earth conductor located on the first surface of the printed circuit board at a corresponding location facing the second earth conductor for grounding the control circuit;
a battery facing the fourth earth conductor;
an antenna connected to the radio circuit;
a first slit between the first earth conductor and the fourth earth conductor; and a second slit for electrically separating the second earth conductor and the third earth conductor.
20. A mobile telecommunication apparatus comprising:
a multi-layered printed circuit board located in a body of the mobile telecommunication apparatus, the multiple layers including a plurality of earth conductors and dielectric boards interleaved between the earth conductors;
a first earth conductor for grounding a radio circuit and a second earth conductor for grounding a control circuit;
a slit for electrically separating the first earth conductor and the second earth conductor; and a battery facing the second earth conductor, wherein the first earth conductor on any surface of the dielectric boards is connected by through-hole plating to the second earth conductor on another surface of the dielectric boards through another of the earth conductors and another of the dielectric boards.
a multi-layered printed circuit board located in a body of the mobile telecommunication apparatus, the multiple layers including a plurality of earth conductors and dielectric boards interleaved between the earth conductors;
a first earth conductor for grounding a radio circuit and a second earth conductor for grounding a control circuit;
a slit for electrically separating the first earth conductor and the second earth conductor; and a battery facing the second earth conductor, wherein the first earth conductor on any surface of the dielectric boards is connected by through-hole plating to the second earth conductor on another surface of the dielectric boards through another of the earth conductors and another of the dielectric boards.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9246569A JPH1188209A (en) | 1997-09-11 | 1997-09-11 | Mobile communication equipment |
| JP9-246569 | 1997-09-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2246925A1 true CA2246925A1 (en) | 1999-03-11 |
Family
ID=17150375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002246925A Abandoned CA2246925A1 (en) | 1997-09-11 | 1998-09-10 | Mobile telecommunication apparatus |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6314273B1 (en) |
| JP (1) | JPH1188209A (en) |
| KR (1) | KR100272621B1 (en) |
| CA (1) | CA2246925A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6653978B2 (en) * | 2000-04-20 | 2003-11-25 | Nokia Mobile Phones, Ltd. | Miniaturized radio frequency antenna |
| WO2001093367A1 (en) * | 2000-06-01 | 2001-12-06 | Mitsubishi Denki Kabushiki Kaisha | Portable wireless terminal |
| US6711387B1 (en) * | 2000-10-13 | 2004-03-23 | Andrew T. Lungley | Radiation-shielding mobile phone case device |
| US6424300B1 (en) * | 2000-10-27 | 2002-07-23 | Telefonaktiebolaget L.M. Ericsson | Notch antennas and wireless communicators incorporating same |
| JP2002171110A (en) * | 2000-11-30 | 2002-06-14 | Toshiba Corp | Radio equipment |
| SE519391C2 (en) * | 2001-06-08 | 2003-02-25 | Allgon Mobile Comm Ab | Portable radio communication apparatus and apparatus for such apparatus |
| KR20040039352A (en) | 2001-09-13 | 2004-05-10 | 프레이투스, 에스.에이. | Multilevel and space-filling ground-planes for miniature and multiband antennas |
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| WO2006032455A1 (en) * | 2004-09-21 | 2006-03-30 | Fractus, S.A. | Multilevel ground-plane for a mobile device |
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| CN103515703B (en) * | 2012-06-28 | 2016-08-03 | 宏碁股份有限公司 | Communicator |
| CN105375117B (en) * | 2015-11-28 | 2019-03-01 | Oppo广东移动通信有限公司 | A kind of antenna assembly and mobile terminal of mobile terminal |
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| US3867759A (en) * | 1973-06-13 | 1975-02-25 | Us Air Force | Method of manufacturing a multi-layered strip transmission line printed circuit board integrated package |
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| US5493702A (en) * | 1993-04-05 | 1996-02-20 | Crowley; Robert J. | Antenna transmission coupling arrangement |
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| JP2658906B2 (en) * | 1994-09-22 | 1997-09-30 | 日本電気株式会社 | Automatic open folding mobile phone |
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| US5633613A (en) * | 1995-02-22 | 1997-05-27 | Hughes Electronics | Modulator-coupled transmission structure and method |
| JPH09270728A (en) * | 1996-04-01 | 1997-10-14 | Nec Corp | Portable radio equipment |
| US5966101A (en) * | 1997-05-09 | 1999-10-12 | Motorola, Inc. | Multi-layered compact slot antenna structure and method |
| US6043786A (en) * | 1997-05-09 | 2000-03-28 | Motorola, Inc. | Multi-band slot antenna structure and method |
-
1997
- 1997-09-11 JP JP9246569A patent/JPH1188209A/en active Pending
-
1998
- 1998-08-18 US US09/135,581 patent/US6314273B1/en not_active Expired - Fee Related
- 1998-09-02 KR KR1019980036038A patent/KR100272621B1/en not_active IP Right Cessation
- 1998-09-10 CA CA002246925A patent/CA2246925A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| KR100272621B1 (en) | 2000-11-15 |
| JPH1188209A (en) | 1999-03-30 |
| KR19990029438A (en) | 1999-04-26 |
| US6314273B1 (en) | 2001-11-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20060123 |