EP1716621A1 - Internal antenna for handset and design method thereof - Google Patents
Internal antenna for handset and design method thereofInfo
- Publication number
- EP1716621A1 EP1716621A1 EP05726766A EP05726766A EP1716621A1 EP 1716621 A1 EP1716621 A1 EP 1716621A1 EP 05726766 A EP05726766 A EP 05726766A EP 05726766 A EP05726766 A EP 05726766A EP 1716621 A1 EP1716621 A1 EP 1716621A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- internal antenna
- antenna
- attached
- handset
- resonant frequency
- 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.)
- Ceased
Links
Classifications
-
- 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
- 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
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
Definitions
- inductance/capacitance is attached and detached to match the resonant
- inductance/capacitance is attached and detached to match the resonant
- FIGS. 18 to 20 are views illustrating standing wave ratios respectively RO/KR 31.03.2005
- FIG. 17 is a view illustrating measurement positions of the plurality of
- FIG. 19 the standing wave ratio of the internal antenna was measured with the
Abstract
The present invention relates to an internal antenna for a handset and a design method thereof. The present invention provides an internal antenna for a handset and a design method thereof characterized in that a L/C element is attached to a slot line of an internal anetnna, the attached L/C element is moved along the slot line, or the L/C element having a predetermined inductance/capacitance is attached and detached, thereby easily matching a resonant frequency.
Description
Λ RO/KR 31.03.2005
INTERNAL ANTENNA FOR HANDSET AND DESIGN METHOD THEREOF
Technical Field The present invention relates to an internal antenna for a handset, and
more particularly, to an internal antenna for a handset and a design method
thereof in which an inductive and/or capacitive element (Hereinafter, referred to
as "L/C element") is attached to a slot line of an internal antenna, or the
attached L/C element is moved along the slot line, or the L/C element having a
predetermined inductance/capacitance is attached and detached, thereby easily
matching a resonant frequency.
Background Art
In recent years, as a portable handset, such as a portable phone, a
portable digital assistance (PDA) and a wireless notebook computer, is being
popularized, a consumer's demand for a terminal having various functions and
designs is being increased. Accordingly, the portable wireless terminal is
being not only gradually miniaturized, light-weighted and simplified, but also its
importance of design is being more highlighted together with a function diversity. In order to satisfy the consumer's demand, the design of the antenna
1 RECORD COPY - TRANSLATION
RO/KR 31.03.2005
essential to a handset body is of importance to the wireless handset.
The antenna is installed at one side of the handset body to function as a
media when a wireless signal is transmitted and received between the wireless
handset and an external wireless station. Therefore, the antenna is advanced
and used in various types such as a fix type, a retractable type, a mount type, a
rotary type, and a snap-in type so as to enhance a performance.
In particular, as the importance of the design is highlighted together with
the function diversity, a built-in antenna (Hereinafter, referred to as "internal
antenna"), which is wholly installed inside of the handset body without
protruding outside of the handset body, has been developed for the wireless
handset.
The internal antenna is installed inside of the handset body and
electrically connected on a main board to perform its proper function.
Compared with a conventional protrusive or external antenna, it is difficult to
design and manufacture the internal antenna.
Specifically, since the antenna body is wholly installed inside of the
handset body, it is very difficult to constantly maintain a frequency characteristic
in assembly and a frequency characteristic in a complete product whose the
handset body is entirely made airtight. Accordingly, there is a drawback in that the matching of the resonant
RO/KR 31.03.2005
frequency deteriorates a productivity of the internal antenna.
Disclosure of Invention
Technical Problem Accordingly, the present invention is directed to an internal antenna for
a handset and a design method thereof that substantially obviate one or more of
the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide an internal antenna for a
handset and a design method thereof in which a resonant frequency can be
easily matched.
Another object of the present invention is to provide an internal antenna
for a handset and a design method thereof in which the internal antenna having
a desired frequency characteristic can be easily designed and manufactured,
thereby stably maintaining a performance of the internal antenna while
enhancing productivity.
Technical Solution
To achieve these and other advantages and in accordance with the
purpose of the present invention, as embodied and broadly described, there is
provided an internal antenna for a handset, characterized in that at least one
RO/KR 31.03.2005
inductive (L) and/or capacitive (C) element (L/C element) is attached to a slot
line of the antenna to match a resonant frequency of the antenna.
Preferably, the attached L/C element is moved along the slot line to
match the resonant frequency, or the L/C element having a predetermined
inductance/capacitance is attached and detached to match the resonant
frequency.
In another aspect of the present invention, there is provided a method
of designing an internal antenna for a handset, characterized in that at least one
inductive (L) and/or capacitive (C) element (L/C element) is attached to a slot
line of the antenna to match a resonant frequency of the antenna.
Preferably, the attached L/C element is moved along the slot line to
match the resonant frequency, or the L/C element having a predetermined
inductance/capacitance is attached and detached to match the resonant
frequency.
Advantageous Effects
According to the present invention, there is an effect in that a LC
element is attached to a slot line of an internal antenna and the attached L/C
element is moved along the slot line to easily match a resonant frequency, so
that the internal antenna having a desired frequency characteristic can be easily
RO/KR 31.03.2005
designed and manufactured, thereby stably maintaining a performance of the
internal antenna while enhancing productivity.
Brief Description of Drawings FIG. 1 is a view illustrating an internal antenna for a handset and a
design method thereof according to an embodiment of the present invention;
FIG. 2 is a view illustrating measurement positions of a L/C element, at
which a frequency characteristic of an internal antenna is measured;
FIGS. 3 to 7 are views illustrating standing wave ratios respectively
measured by moving a L/C element along measurement positions of FIG. 2;
FIG. 8 is a view illustrating a measurement position of a L/C element, at
which a frequency characteristic of an internal antenna is measured depending
on a variation of an inductance and/or a capacitance;
FIGS. 9 to 16 are views illustrating standing wave ratios respectively
measured by varying an inductance and/or a capacitance at a measurement
position of FIG. 8;
FIG. 17 is a view illustrating measurement positions of a plurality of L/C
elements, at which a frequency characteristic of an internal antenna is
measured depending on a variation of an inductance and/or a capacitance; and FIGS. 18 to 20 are views illustrating standing wave ratios respectively
RO/KR 31.03.2005
measured by varying an inductance and/or a capacitance at a measurement
position of FIG. 17.
Best Mode for Carrying Out the Invention Hereinafter, preferred embodiments of the present invention will be
described in detail with reference to accompanying drawings.
FIG. 1 is a view illustrating an internal antenna for a handset and a
design method thereof according to an embodiment of the present invention.
As shown in FIG. 1 , the internal antenna 100 includes a flat-shaped
antenna body 110 having a predetermined meander line formed by a slot 120.
In a general manner, the internal antenna 100 adjusts a length and a
width of the meander line of the antenna body 110 by using the slot 120, to
adjust a resonant frequency. For a minute adjustment, an inductive and/or
capacitive element (Hereinafter, referred to as "L/C element") 130 is attached
along the slot 120.
Specifically, the inventive internal antenna 100 includes the L/C element
130 for selecting an inductance (L) and/or a capacitance (C), to obtain a desired
frequency characteristic without a pattern limitation of the slot 120 and the
antenna body 110. Further, the L/C element 130 can be moved and adjusted along the slot
RO/KR 31 .03.2005
120 to easily match the resonant frequency of the antenna.
Hereinafter, the inventive internal antenna for the handset and the
design method thereof are in detail described through modified examples below.
(1 ) Characteristic measurement when the L/C element is moved along
the slot.
FIG. 2 is a view illustrating measurement positions of the L/C element,
at which the frequency characteristic of the internal antenna is measured.
FIGS. 3 to 7 are views illustrating standing wave ratios (SWR) respectively
measured by moving the L/C element along the measurement positions of FIG.
In an experiment method, the standing wave ratios of the internal
antenna were measured with the inductive element having an inductance (L) of
1 nH and the L/C element attached at five points along the slot as shown in FIG.
2. FIGS. 3 to 7 illustrate the standing wave ratios of the internal antenna
where the L/C element is positioned at a measurement point 1 , a measurement
point 2, a measurement point 3, a measurement point 4 and a measurement
point 5.
As shown in FIGS. 3 to 7, the L/C element can be changed in position,
thereby easily adjusting the resonant frequency and not only easily adjusting a
RO/KR 31 .03.2005
bandwidth at each resonant frequency, but also adjusting the number of the
resonant frequency.
(2) Characteristic measurement when the inductance and/or the
capacitance are/is varied at the same position of the slot.
FIG. 8 is a view illustrating the measurement position of the L/C
element, at which the frequency characteristic of the internal antenna is
measured depending on the variation of the inductance and/or the capacitance.
FIGS. 9 to 16 are views illustrating standing wave ratios respectively measured
by varying the inductance and/or the capacitance at the measurement position
of FIG. 8.
In an experiment method, the standing wave ratios of the internal
antenna were measured in case where the L/C element is not attached at the
measurement point 1 of FIG. 8 and in case where the L/C element having
different inductance (L) and/or capacitance (C) is attached at the measurement
point 1 of FIG. 8.
FIGS. 9 to 12 illustrate the standing wave ratios of the internal antenna
where the L/C element is not attached and in case where the inductive element
having an inductance (L) of 1nH, 10nH or 22nH is attached. Further, FIGS. 13 to 16 illustrate the standing wave ratios of the internal
RO/KR 31.03.2005
antenna where the L/C element is not attached and in case where the
capacitive element having an capacitance (C) of 0.5pF, 2pF or 4pF is attached.
As shown in FIGS. 9 to 12 and 13 to 16, the inductance and the
capacitance are varied, thereby easily adjusting the resonant frequency at a
frequency of 1 GHz and not only easily adjusting the bandwidth at each resonant
frequency, but also adjusting the number of the resonant frequency.
(3) Characteristic measurement when a plurality of L/C elements are
attached to the slot. FIG. 17 is a view illustrating measurement positions of the plurality of
L/C elements, at which a frequency characteristic of an internal antenna is
measured depending on the variation of the inductance and/or the capacitance.
FIGS. 18 to 20 are views illustrating standing wave ratios respectively
measured by varying the inductance and/or the capacitance at the
measurement position of FIG. 17.
In an experiment method, the standing wave ratios were measured with
two L/C elements attached to the slot of FIG. 17 and with the inductance (L) of
1 nH or 22nH set at the measurement point 1 and the capacitance (C) of 1 pF set
at the measurement point 2. In FIG. 18, the standing wave ratio of the internal antenna was
RO/KR 31 .03.2005
measured with the L/C element attached only at the measurement point 1. In
FIG. 19, the standing wave ratio of the internal antenna was measured with the
L/C element having the inductance (L) of 1 nH at the measurement point 1 and
the capacitance (C) of 1 pF at the measurement point 2. In FIG. 20, the
standing wave ratio of the internal antenna was measured with the L/C element
having the inductance (L) of 22nH at the measurement point 1 and the
capacitance (C) of 1 pF at the measurement point 2.
As shown in FIGS. 18 to 20, the plurality of L/C elements are attached
and their inductance and capacitance are varied, thereby easily adjusting the
resonant frequency and not only easily adjusting the bandwidth at each
resonant frequency, but also adjusting the number of the resonant frequency at
a predetermined bandwidth.
Industrial Applicability As described above, the internal antenna for the handset and the
design method thereof according to the present invention facilitate the matching
of the resonant frequency, thereby not only facilitating the design and the
manufacture of the internal antenna having the desired frequency characteristic,
but also stably maintaining the performance of the internal antenna while
enhancing productivity.
RO/KR 31.03.2005
While the present invention has been described and illustrated herein
with reference to the preferred embodiments thereof, it will be apparent to those
skilled in the art that various modifications and variations can be made therein
without departing from the spirit and scope of the invention. Thus, it is
intended that the present invention covers the modifications and variations of
this invention that come within the scope of the appended claims and their
equivalents.
Claims
1. An internal antenna for a handset, wherein at least one inductive (L) and/or capacitive (C) element (L/C element) is attached to a slot line of the antenna to match a resonant frequency of the
5 antenna.
2. The antenna according to claim 1 , wherein the attached L/C element is moved along the slot line to match the resonant frequency.
0 3. The antenna according to claim 1 or 2, wherein the L/C element having a predetermined inductance/capacitance is attached and detached to match the resonant frequency.
4. A method of designing an internal antenna for a handset, 5 wherein at least one inductive (L) and/or capacitive (C) element (L/C element) is attached to a slot line of the antenna to match a resonant frequency of the antenna.
5. The method according to claim 4, wherein the attached L/C element is
o moved along the slot line to match the resonant frequency.
6. The method according to claim 4 or 5, wherein the L/C element having 430 RO/KR 31.03.2005
a predetermined inductance/capacitance is attached and detached to match the
resonant frequency.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20040010972 | 2004-02-19 | ||
| KR1020050013204A KR100672206B1 (en) | 2004-02-19 | 2005-02-17 | Internal antenna for handset and design method thereof |
| PCT/KR2005/000430 WO2005081360A1 (en) | 2004-02-19 | 2005-02-18 | Internal antenna for handset and design method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1716621A1 true EP1716621A1 (en) | 2006-11-02 |
| EP1716621A4 EP1716621A4 (en) | 2007-03-28 |
Family
ID=34889492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05726766A Ceased EP1716621A4 (en) | 2004-02-19 | 2005-02-18 | Internal antenna for handset and design method thereof |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1716621A4 (en) |
| JP (1) | JP2007523558A (en) |
| WO (1) | WO2005081360A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101243583A (en) * | 2005-08-24 | 2008-08-13 | 皇家飞利浦电子股份有限公司 | Device comprising an antenna for exchanging radio frequency signals |
| US7242355B2 (en) * | 2005-11-23 | 2007-07-10 | Sony Ericsson Mobile Communications Ab | Frequency band switching of an antenna arrangement |
| WO2007091208A1 (en) * | 2006-02-06 | 2007-08-16 | Koninklijke Philips Electronics N.V. | Multi-band slot antenna |
| WO2007138960A1 (en) | 2006-05-25 | 2007-12-06 | Panasonic Corporation | Variable slot antenna and method for driving same |
| CN101401262B (en) | 2006-05-25 | 2012-10-10 | 松下电器产业株式会社 | Variable slot antenna and method for driving same |
| CN101308950A (en) * | 2007-05-18 | 2008-11-19 | 英资莱尔德无线通信技术（北京）有限公司 | Antenna device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3210766A (en) * | 1962-02-15 | 1965-10-05 | Ralph O Parker | Slot type antenna with tuning circuit |
| US4367475A (en) * | 1979-10-30 | 1983-01-04 | Ball Corporation | Linearly polarized r.f. radiating slot |
| US5589840A (en) * | 1991-11-05 | 1996-12-31 | Seiko Epson Corporation | Wrist-type wireless instrument and antenna apparatus |
| US6188369B1 (en) * | 1997-05-30 | 2001-02-13 | Hitachi, Ltd. | Tunable slot antenna with capacitively coupled slot island conductor for precise impedance adjustment |
| EP1367673A1 (en) * | 2002-05-31 | 2003-12-03 | Thomson Licensing S.A. | Improvement to planar antennas of the slot type |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR930703716A (en) * | 1991-11-05 | 1993-11-30 | 스스무 아이자와 | Antenna device for radio |
| JP2003078345A (en) * | 2001-09-03 | 2003-03-14 | Sansei Denki Kk | Slot type bow tie antenna device and configuring method therefor |
| JP2003188637A (en) * | 2001-12-20 | 2003-07-04 | Hitachi Cable Ltd | Plane multiplex antenna and portable terminal |
| WO2003058758A1 (en) * | 2001-12-27 | 2003-07-17 | Hrl Laboratories, Llc | RF MEMs-TUNED SLOT ANTENNA AND A METHOD OF MAKING SAME |
| US20050174294A1 (en) * | 2002-05-31 | 2005-08-11 | The Regents Of The University Of Michigan | Switchable slot antenna |
-
2005
- 2005-02-18 EP EP05726766A patent/EP1716621A4/en not_active Ceased
- 2005-02-18 WO PCT/KR2005/000430 patent/WO2005081360A1/en active Application Filing
- 2005-02-18 JP JP2006554024A patent/JP2007523558A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3210766A (en) * | 1962-02-15 | 1965-10-05 | Ralph O Parker | Slot type antenna with tuning circuit |
| US4367475A (en) * | 1979-10-30 | 1983-01-04 | Ball Corporation | Linearly polarized r.f. radiating slot |
| US5589840A (en) * | 1991-11-05 | 1996-12-31 | Seiko Epson Corporation | Wrist-type wireless instrument and antenna apparatus |
| US6188369B1 (en) * | 1997-05-30 | 2001-02-13 | Hitachi, Ltd. | Tunable slot antenna with capacitively coupled slot island conductor for precise impedance adjustment |
| EP1367673A1 (en) * | 2002-05-31 | 2003-12-03 | Thomson Licensing S.A. | Improvement to planar antennas of the slot type |
Non-Patent Citations (2)
| Title |
|---|
| HONG CHENG-SHONG: "Small annular slot antenna with capacitor loading" ELECTRONICS LETTERS, IEE STEVENAGE, GB, vol. 36, no. 2, 20 January 2000 (2000-01-20), pages 110-111, XP006014711 ISSN: 0013-5194 * |
| See also references of WO2005081360A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007523558A (en) | 2007-08-16 |
| EP1716621A4 (en) | 2007-03-28 |
| WO2005081360A1 (en) | 2005-09-01 |
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