EP1624523A1 - Antenna device - Google Patents
Antenna device Download PDFInfo
- Publication number
- EP1624523A1 EP1624523A1 EP05012882A EP05012882A EP1624523A1 EP 1624523 A1 EP1624523 A1 EP 1624523A1 EP 05012882 A EP05012882 A EP 05012882A EP 05012882 A EP05012882 A EP 05012882A EP 1624523 A1 EP1624523 A1 EP 1624523A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit board
- printed circuit
- conductive shield
- antenna device
- connection portion
- 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.)
- Granted
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Classifications
-
- 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
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/526—Electromagnetic shields
Definitions
- the invention relates in general to an antenna device and in particular to an antenna device with improved reception.
- Embedded antennas such as chip antennas and planar antennas, are widely applied to wireless communication devices.
- One conventional chip antenna is a ceramic chip antenna produced by LTCC (Low Temperature Co-fired Ceramic) technology.
- Conventional planar antennas such as microstrip antennas, printed antennas and Planar Inverted F Antennas (PIFAs), are generally applied in GSM 'DCS' 'UMTS' WLAN and bluetooth wireless equipment such as mobile phones and wireless LAN adapters.
- LTCC Low Temperature Co-fired Ceramic
- a conventional wireless communication device 10 with PIFA such as a wireless LAN adapter, primarily comprises a plastic housing C and a printed circuit board 20 disposed therein.
- the housing C encloses the printed circuit board 20 with PIFA structure formed thereon for transmitting and receiving radio signals.
- the printed circuit board 20 features a conventional PIFA structure, comprising a substrate 200, a feed line 201, a short line 202, a longitudinal wire 203 and a ground G.
- the longitudinal wire 203 has an open end 2030 and a closed end 2031 connecting the short line 202.
- the short line 202 connects the closed end 2031 with the ground G, and the feed line 201 is extended from the middle part of the longitudinal wire 203 to an external circuit (not shown).
- the feed line 201 and the ground G are insulated, and the distance from the open end 2030 to the closed end 2031 is substantially equal to 1/4 of a radio signal wavelength.
- the PIFA structure including the feed line 201, short line 202, longitudinal wire 203 and ground G is formed on the substrate 200 surface, however, it is suitable for horizontally polarized radio waves but not preferable for receiving vertically polarized radio signals.
- inventions of the invention provide an antenna device.
- the antenna device comprises a printed circuit board, a conductive shield, a first connection portion and a second connection portion.
- the printed circuit board comprises a feed point and a ground plane insulated from the feed point.
- the conductive shield surrounds the printed circuit board.
- the first connection portion is substantially perpendicular to the printed circuit board, electrically connecting the feed point and the conductive shield.
- the second connection portion is substantially perpendicular to the printed circuit board, electrically connecting the ground plane and the conductive shield.
- the antenna device is applied to a wireless communication device, such as a mobile phone or a wireless LAN adapter, and primarily comprises a printed circuit board P, a metallic conductive shield C, a first connection portion A1 and a second connection portion A2.
- the printed circuit board P comprises signal processing circuits and radio communication circuits.
- the rectangular metallic conductive shield C is hollow and extends along a central axis X thereof, consisting of four conductive plates C1, C2, C3 and C4 surrounding the printed circuit board P.
- the hollow conductive shield C defines a rectangular opening C0 with the central axis X passing therethrough, and the printed circuit board P is disposed in the conductive shield C and parallel to the central axis X.
- the printed circuit board P of the antenna device is electrically connected with the conductive shield C by the longitudinal first and second connection portions A1 and A2, forming a 3-D antenna structure.
- the longitudinal first and second connection portions A1 and A2 are disposed perpendicular to the printed circuit board P and the conductive plate C1.
- the first connection portion A1 electrically connects a feed point F of the printed circuit board P
- the second connection portion A2 electrically connects a ground plane G of the printed circuit board P, wherein the feed point F and the ground plane G are insulated.
- the first and second connection portions A1 and A2 are extended upward from the printed circuit board P to the conductive shield C forming a 3-D antenna structure, capable of receiving vertically polarized signal thereby providing omnidirectional communication.
- the length of the conductive shield C along X axis can be appropriately determined for receiving radio signals of specific frequency.
- the reception efficiency for vertically polarized radio signals is thereby improved.
- embodiments of the invention provide an antenna device facilitating the reception efficiency with respect to vertically polarized radio signals.
- Embodiments of the invention are suitable for application in wireless communication devices, such as mobile phones and wireless LAN adapters.
- the metallic conductive shield C not only has a specific metal texture, but also provides better structural strength than the conventional plastic housing.
Abstract
Description
- The invention relates in general to an antenna device and in particular to an antenna device with improved reception.
- Embedded antennas, such as chip antennas and planar antennas, are widely applied to wireless communication devices. One conventional chip antenna is a ceramic chip antenna produced by LTCC (Low Temperature Co-fired Ceramic) technology. Conventional planar antennas such as microstrip antennas, printed antennas and Planar Inverted F Antennas (PIFAs), are generally applied in GSM 'DCS' 'UMTS' WLAN and bluetooth wireless equipment such as mobile phones and wireless LAN adapters.
- Referring to Figs. 1a and 1b, a conventional
wireless communication device 10 with PIFA, such as a wireless LAN adapter, primarily comprises a plastic housing C and a printedcircuit board 20 disposed therein. The housing C encloses the printedcircuit board 20 with PIFA structure formed thereon for transmitting and receiving radio signals. As shown in Fig. 1b, the printedcircuit board 20 features a conventional PIFA structure, comprising asubstrate 200, afeed line 201, ashort line 202, alongitudinal wire 203 and a ground G. Thelongitudinal wire 203 has anopen end 2030 and a closedend 2031 connecting theshort line 202. In Fig. 1b, theshort line 202 connects the closedend 2031 with the ground G, and thefeed line 201 is extended from the middle part of thelongitudinal wire 203 to an external circuit (not shown). Particularly, thefeed line 201 and the ground G are insulated, and the distance from theopen end 2030 to the closedend 2031 is substantially equal to 1/4 of a radio signal wavelength. As the PIFA structure including thefeed line 201,short line 202,longitudinal wire 203 and ground G is formed on thesubstrate 200 surface, however, it is suitable for horizontally polarized radio waves but not preferable for receiving vertically polarized radio signals. - Accordingly, embodiments of the invention provide an antenna device. The antenna device comprises a printed circuit board, a conductive shield, a first connection portion and a second connection portion. The printed circuit board comprises a feed point and a ground plane insulated from the feed point. The conductive shield surrounds the printed circuit board. The first connection portion is substantially perpendicular to the printed circuit board, electrically connecting the feed point and the conductive shield. The second connection portion is substantially perpendicular to the printed circuit board, electrically connecting the ground plane and the conductive shield.
- The invention will become more fully understood from the following detailed description and the accompanying drawings, given by way of illustration only and thus not intended to be limit the disclosure.
- FIG. 1a is a perspective diagram of a conventional wireless communication device provided with a PIFA therein;
- FIG. 1b is a perspective diagram of a PIFA structure formed on the printed circuit board according to Fig. 1a.
- FIG. 2a is a perspective diagram of the antenna device of an embodiment of the invention; and
- FIG. 2b is a side view of the antenna device in direction X1 according to Fig. 2a.
- Referring to Figs. 2a and 2b, the antenna device is applied to a wireless communication device, such as a mobile phone or a wireless LAN adapter, and primarily comprises a printed circuit board P, a metallic conductive shield C, a first connection portion A1 and a second connection portion A2. The printed circuit board P comprises signal processing circuits and radio communication circuits. As shown in Fig. 2a, the rectangular metallic conductive shield C is hollow and extends along a central axis X thereof, consisting of four conductive plates C1, C2, C3 and C4 surrounding the printed circuit board P. The hollow conductive shield C defines a rectangular opening C0 with the central axis X passing therethrough, and the printed circuit board P is disposed in the conductive shield C and parallel to the central axis X.
- Specifically, the printed circuit board P of the antenna device is electrically connected with the conductive shield C by the longitudinal first and second connection portions A1 and A2, forming a 3-D antenna structure. As shown in Figs. 2a and 2b, the longitudinal first and second connection portions A1 and A2 are disposed perpendicular to the printed circuit board P and the conductive plate C1. Particularly, the first connection portion A1 electrically connects a feed point F of the printed circuit board P, and the second connection portion A2 electrically connects a ground plane G of the printed circuit board P, wherein the feed point F and the ground plane G are insulated.
- Referring to Fig. 2b, the first and second connection portions A1 and A2 are extended upward from the printed circuit board P to the conductive shield C forming a 3-D antenna structure, capable of receiving vertically polarized signal thereby providing omnidirectional communication. The length of the conductive shield C along X axis can be appropriately determined for receiving radio signals of specific frequency. Moreover, as the first and second connection portions A1 and A2 are erected perpendicular to the printed circuit board P, the reception efficiency for vertically polarized radio signals is thereby improved.
- In summary, embodiments of the invention provide an antenna device facilitating the reception efficiency with respect to vertically polarized radio signals. Embodiments of the invention are suitable for application in wireless communication devices, such as mobile phones and wireless LAN adapters. The metallic conductive shield C not only has a specific metal texture, but also provides better structural strength than the conventional plastic housing.
- While the invention has been described by way of example and in terms of preferred embodiments, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation to encompass all such modifications and similar arrangements.
Claims (7)
- An antenna device, comprising:a printed circuit board, comprising a feed point and a ground plane insulated from the feed point;a conductive shield surrounding the printed circuit board;a first connection portion substantially perpendicular to the printed circuit board, electrically connecting the feed point and the conductive shield; anda second connection portion substantially perpendicular to the printed circuit board, electrically connecting the ground plane and the conductive shield.
- The antenna device as claimed in claim 1, wherein the conductive shield is extended along a central axis thereof, comprising an opening with the central axis passing therethrough.
- The antenna device as claimed in claim 2, wherein the printed circuit board is parallel to the central axis.
- The antenna device as claimed in claim 2, wherein the first and second connection portions are perpendicular to the conductive shield.
- The antenna device as claimed in claim 1, wherein the conductive shield is wire.
- The antenna device as claimed in claim 1, wherein the opening is rectangular.
- A wireless communication device, comprising:a printed circuit board, comprising a feed point and a ground plane insulated from the feed point;a conductive shield surrounding the printed circuit board;a first connection portion substantially perpendicular to the printed circuit board, electrically connecting the feed point and the conductive shield; anda second connection portion substantially perpendicular to the printed circuit board, electrically connecting the ground plane and the conductive shield.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200410563686 | 2004-08-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1624523A1 true EP1624523A1 (en) | 2006-02-08 |
EP1624523B1 EP1624523B1 (en) | 2008-03-26 |
Family
ID=34937469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20050012882 Active EP1624523B1 (en) | 2004-08-03 | 2005-06-15 | Antenna device |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1624523B1 (en) |
DE (1) | DE602005005576T2 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4975711A (en) * | 1988-08-31 | 1990-12-04 | Samsung Electronic Co., Ltd. | Slot antenna device for portable radiophone |
JPH06260949A (en) * | 1993-03-03 | 1994-09-16 | Seiko Instr Inc | Radio equipment |
US6392603B1 (en) * | 1999-10-29 | 2002-05-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Module antenna device |
US20040082309A1 (en) * | 2002-10-29 | 2004-04-29 | Smith Freddie W. | Printer |
EP1445825A2 (en) * | 2003-02-07 | 2004-08-11 | Sony Ericsson Mobile Communications Japan, Inc. | A portable wireless apparatus |
-
2005
- 2005-06-15 DE DE200560005576 patent/DE602005005576T2/en active Active
- 2005-06-15 EP EP20050012882 patent/EP1624523B1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4975711A (en) * | 1988-08-31 | 1990-12-04 | Samsung Electronic Co., Ltd. | Slot antenna device for portable radiophone |
JPH06260949A (en) * | 1993-03-03 | 1994-09-16 | Seiko Instr Inc | Radio equipment |
US6392603B1 (en) * | 1999-10-29 | 2002-05-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Module antenna device |
US20040082309A1 (en) * | 2002-10-29 | 2004-04-29 | Smith Freddie W. | Printer |
EP1445825A2 (en) * | 2003-02-07 | 2004-08-11 | Sony Ericsson Mobile Communications Japan, Inc. | A portable wireless apparatus |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 018, no. 661 (E - 1644) 14 December 1994 (1994-12-14) * |
Also Published As
Publication number | Publication date |
---|---|
EP1624523B1 (en) | 2008-03-26 |
DE602005005576D1 (en) | 2008-05-08 |
DE602005005576T2 (en) | 2009-05-07 |
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