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EP1339132A1 - Patchantenne - Google Patents

Patchantenne Download PDF

Info

Publication number
EP1339132A1
EP1339132A1 EP03250910A EP03250910A EP1339132A1 EP 1339132 A1 EP1339132 A1 EP 1339132A1 EP 03250910 A EP03250910 A EP 03250910A EP 03250910 A EP03250910 A EP 03250910A EP 1339132 A1 EP1339132 A1 EP 1339132A1
Authority
EP
European Patent Office
Prior art keywords
ground conductor
patch
patch antenna
dielectric substrate
patch electrode
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.)
Withdrawn
Application number
EP03250910A
Other languages
English (en)
French (fr)
Inventor
Yuanzhu c/o Alps Electric Co. Ltd. Dou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Publication of EP1339132A1 publication Critical patent/EP1339132A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
    • 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

  • the present invention relates to a patch antenna that is suitable for use, for example, in a wireless LAN (local area network).
  • a wireless LAN local area network
  • linear antennas such as dipole antennas and monopole antennas are usually used. These antennas are non-directive, i.e., radiate radio waves with the same intensity in all directions, in a plane that is perpendicular to an antenna conductor, allowing reception of radio waves in an operating frequency range transmitted from any direction 360 degrees around the antennas.
  • a patch antenna 1 shown in Fig. 5 is used as an antenna to be mounted or pre-installed on an electronic apparatus, such as a personal computer, circularly polarized waves as well as linearly polarized waves can be readily used as operating radio waves, allowing significant improvement in versatility.
  • a patch electrode 3 is provided on one surface of a dielectric substrate 2
  • a ground conductor 4 is provided on the other surface of the dielectric substrate 2
  • a high-frequency signal is fed to the patch electrode 3 via a feed pin 5.
  • the patch antenna 1 constructed as described above, transmission and reception of linearly polarized waves are allowed if the patch electrode 3, serving as a radiating element, is circular or square in shape, while transmission and reception of circularly polarized waves are allowed if degeneracy-breaking elements such as cutouts or protrusions are provided on the patch electrode 3.
  • the directivity of the patch antenna 1 described above is such that a substantially spherical main radiation pattern (main lobe) is formed in front of the patch electrode 3 (a space opposite to the dielectric substrate 2), as indicated by a double-dotted chain line in Fig. 5, allowing transmission and reception only in front of the patch antenna 3.
  • the conventional patch antenna 1 is not suitable as an antenna that can be used even under an environment where the location of a target for transmission or reception cannot be specified.
  • the present invention has been made in view of the situation of the conventional art described above, and an object thereof is to provide a patch antenna in which directivity is weakened so that a radiation pattern extending in multiple directions around is formed.
  • the present invention provides a patch antenna including a dielectric substrate; a patch electrode for receiving a feed of a high-frequency signal, provided on one surface of the dielectric substrate; and a ground conductor provided on the other surface of the dielectric substrate; wherein the ground conductor has a planar shape that substantially coincides with the patch electrode facing the ground conductor via the dielectric substrate.
  • the arrangement may be such that one of the patch electrode and the ground conductor radiates forward a right-hand circularly polarized (RHCP) wave and the other radiates forward a left-hand circularly polarized (LHCP) wave.
  • RHCP right-hand circularly polarized
  • LHCP left-hand circularly polarized
  • Fig. 1 is a front view of a patch antenna according to a first embodiment of the present invention
  • Fig. 2 is a sectional view of the patch antenna.
  • a patch antenna 11 shown in Figs. 1 and 2 includes a dielectric substrate 12; a patch electrode 13 having a square shape in a plan view, provided on one surface of the dielectric substrate 12; and a ground conductor 14 having the same shape as that of the patch electrode 13, provided on the other surface of the dielectric substrate 12.
  • the patch electrode 13 receives a feed of a high-frequency signal via a feed pin 15. Since the patch electrode 13, which functions as a radiating element, has a square shape, the patch antenna 11 allows transmission and reception of linearly polarized waves.
  • the ground conductor 14 has a square shape of the same size as the patch electrode 13, and the planar shapes of the ground conductor 14 and the patch electrode 13 overlap with each other when viewed along a thickness direction of the dielectric substrate 12.
  • the patch antenna 11 has a radiation pattern shaped like a peanut hull when viewed from a side, as indicated by a double-dotted chain line in Fig. 2.
  • the ground conductor 14 has a planar shape substantially coinciding with that of the patch electrode 13 facing the ground conductor 14 via the dielectric substrate 12.
  • directivity for radiating radio waves intensely in a particular direction is weakened, allowing transmission and reception of linearly polarized waves both in front and at the back of the patch electrode 13. Accordingly, even under an environment where the location of a target for transmission or reception cannot be specified, for example, in a wireless LAN, use of the patch antenna 11 allows favorable transmission and reception in unspecified directions and readily allows improvement in gain.
  • the patch electrode 13 and the ground conductor 14 may be circular in planar shape.
  • Fig. 3 is a front view of a patch antenna according to a second embodiment of the present invention
  • Fig. 4 is a rear view of the patch antenna.
  • a patch antenna 21 shown in Figs. 3 and 4 is used for transmission and reception of circularly polarized waves.
  • a patch electrode 23 on a dielectric substrate 22 has cutouts 23a and 23b, which serve as degeneracy-breaking elements, and the patch electrode 23 receives a feed of a high-frequency signal via a feed pin 25.
  • a ground conductor 24 similarly to the first embodiment described earlier, has a planar shape substantially coinciding with that of the patch electrode 23 facing the ground conductor 24 via the dielectric substrate 22, so that the ground conductor 24 has cutouts 24a and 24b.
  • the patch antenna 21 constructed as described above has a radiation pattern shaped like a peanut hull, allowing transmission and reception of circularly polarized waves both in front and at the back of the patch electrode 23. Furthermore, the patch electrode 23 is shaped so as to radiate forward a right-hand circularly polarized wave, as shown in Fig. 3, while the ground conductor 24 is shaped so as to radiate forward a left-hand circularly polarized wave, as shown in Fig. 4.
  • an operating radio wave is a right-hand circularly polarized wave or a left-hand circularly polarized wave, the radio wave whose direction of rotation of electric filed is reversed by reflection at a room wall or the like is efficiently transmitted or received. Accordingly, use of the patch antenna 21 allows favorable transmission and reception in unspecified directions and readily allows improvement in gain under an environment where the location of a target for transmission or reception of a circularly polarized radio wave cannot be specified.
  • the degeneracy-breaking elements of the patch electrode 23 and the ground conductor 24 may be protrusions instead of cutouts, and may be formed at positions selected as desired. Furthermore, although the degeneracy-breaking elements are implemented by square-shaped conductors in this embodiment, the degeneracy-breaking elements may be implemented by circular-shaped or elliptical-shaped conductors.

Landscapes

  • Waveguide Aerials (AREA)
  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP03250910A 2002-02-15 2003-02-14 Patchantenne Withdrawn EP1339132A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002038867A JP2003243926A (ja) 2002-02-15 2002-02-15 パッチアンテナ
JP2002038867 2002-02-15

Publications (1)

Publication Number Publication Date
EP1339132A1 true EP1339132A1 (de) 2003-08-27

Family

ID=27655119

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03250910A Withdrawn EP1339132A1 (de) 2002-02-15 2003-02-14 Patchantenne

Country Status (2)

Country Link
EP (1) EP1339132A1 (de)
JP (1) JP2003243926A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1622221A1 (de) * 2004-02-11 2006-02-01 Sony Deutschland GmbH Zirkular polarisierte Gruppenantenne
SG133500A1 (en) * 2005-12-08 2007-07-30 Alps Electric Co Ltd Patch antenna
US7416135B2 (en) 2004-12-16 2008-08-26 Denso Corporation IC tag and IC tag attachment structure
EP2207238A1 (de) * 2009-01-08 2010-07-14 Oticon A/S Miniaturpatchantenne
JP5170109B2 (ja) * 2008-01-07 2013-03-27 富士通株式会社 電子装置、アンテナおよび物品

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5041838A (en) * 1990-03-06 1991-08-20 Liimatainen William J Cellular telephone antenna
EP0688040A2 (de) * 1994-06-13 1995-12-20 Nippon Telegraph And Telephone Corporation Gedruckte Antenne mit zwei Strahlrichtungen
US5552790A (en) * 1992-01-23 1996-09-03 Saab-Scania Combitech Aktiebolag Device for wireless transfer of information
EP0924795A1 (de) * 1997-12-19 1999-06-23 Murata Manufacturing Co., Ltd. Oberflächenmontierte Antenne und Kommunikationsgerät damit
US5955995A (en) * 1997-01-21 1999-09-21 Texas Instruments Israel Ltd. Radio frequency antenna and method of manufacture thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5041838A (en) * 1990-03-06 1991-08-20 Liimatainen William J Cellular telephone antenna
US5552790A (en) * 1992-01-23 1996-09-03 Saab-Scania Combitech Aktiebolag Device for wireless transfer of information
EP0688040A2 (de) * 1994-06-13 1995-12-20 Nippon Telegraph And Telephone Corporation Gedruckte Antenne mit zwei Strahlrichtungen
US5955995A (en) * 1997-01-21 1999-09-21 Texas Instruments Israel Ltd. Radio frequency antenna and method of manufacture thereof
EP0924795A1 (de) * 1997-12-19 1999-06-23 Murata Manufacturing Co., Ltd. Oberflächenmontierte Antenne und Kommunikationsgerät damit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1622221A1 (de) * 2004-02-11 2006-02-01 Sony Deutschland GmbH Zirkular polarisierte Gruppenantenne
US7416135B2 (en) 2004-12-16 2008-08-26 Denso Corporation IC tag and IC tag attachment structure
SG133500A1 (en) * 2005-12-08 2007-07-30 Alps Electric Co Ltd Patch antenna
JP5170109B2 (ja) * 2008-01-07 2013-03-27 富士通株式会社 電子装置、アンテナおよび物品
EP2207238A1 (de) * 2009-01-08 2010-07-14 Oticon A/S Miniaturpatchantenne
US8125391B2 (en) 2009-01-08 2012-02-28 Oticon A/S Miniature patch antenna

Also Published As

Publication number Publication date
JP2003243926A (ja) 2003-08-29

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