EP1579529A4 - Antennes a encombrement reduit et performance amelioree - Google Patents

Antennes a encombrement reduit et performance amelioree

Info

Publication number
EP1579529A4
EP1579529A4 EP03808509A EP03808509A EP1579529A4 EP 1579529 A4 EP1579529 A4 EP 1579529A4 EP 03808509 A EP03808509 A EP 03808509A EP 03808509 A EP03808509 A EP 03808509A EP 1579529 A4 EP1579529 A4 EP 1579529A4
Authority
EP
European Patent Office
Prior art keywords
antenna
conductor
antenna element
elongated conductor
substrate
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Withdrawn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
EP03808509A
Other languages
German (de)
English (en)
Other versions
EP1579529A2 (fr
Inventor
Vaneet Pathak
Gregory Poilasne
Laurent Desclos
Sebastian Rowson
Jeff Shamblin
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.)
Ethertronics Inc
Original Assignee
Ethertronics Inc
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
Priority claimed from US10/322,196 external-priority patent/US7084813B2/en
Priority claimed from US10/375,423 external-priority patent/US8059047B2/en
Priority claimed from US10/643,102 external-priority patent/US7616164B2/en
Application filed by Ethertronics Inc filed Critical Ethertronics Inc
Publication of EP1579529A2 publication Critical patent/EP1579529A2/fr
Publication of EP1579529A4 publication Critical patent/EP1579529A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • 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
    • 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
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent 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
    • H01Q19/10—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 using reflecting surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • 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
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • 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
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • H01Q9/265—Open ring dipoles; Circular dipoles
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present invention relates generally to the field of wireless communications, and particularly to the size reduction and performance improvement of capacitively loaded magnetic dipole antennas.
  • the radiated electromagnetic wave from an antenna is characterized by the complex vector E x H in which E is the electric field and H is the magnetic field.
  • Polarization describes the orientation of the radiated wave's electric field. For maximum performance, polarization must be matched to the orientation of the radiated field to receive the maximum field intensity of the electromagnetic wave. If it is not oriented properly, a portion of the signal is lost, known as polarization loss.
  • CLMD CLMD antenna having antenna elements having improved grounding characteristics to improve isolation.
  • Other embodiments provide a reduction in the footprint of the antenna elements while maintaining the perfonnance characteristics by providing a greater surface area on either a top, middle or bottom portion of a CLMD antenna.
  • Further embodiments provide antenna element arrangements with improved radiation efficiency by providing metallic reflectors on the sides of antenna elements.
  • the isolation characteristics of antenna elements are improved through the use of coplanar wave guides.
  • the bandwidth may be improved through the use of stubs resonators.
  • the bandwidth of the antenna elements is improved without reducing isolation or shielding by providing a variable gap between two portions of the antenna elements.
  • the first and second portion may be coupled to the FR4 substrate, wherein the FR4 substrate is defined by a periphery, wherein within the periphery the FR4 substrate defines a void, and wherein the capacitive area generally spans the void.
  • the system may comprise a wireless communications device.
  • the method may further include the step of: providing a high dissipation factor substrate, wherein the high dissipation factor substrate is defined by a periphery, wherein within the periphery the high dissipation factor substrate defines a void, and wherein the capacitive area generally spans the void.
  • Figure 7C illustrates a side-view of another embodiment of an antenna element in accordance with the present invention.
  • Figure 7F illustrates a side-view of various embodiments of the bottom portion of the antenna element illustrated in Figure 3E;
  • Figure 9E illustrates a top-view of another embodiment of an antenna element arrangement in accordance with the present invention.
  • Figures 10B and 6C illustrate cross-sectional views taken along VLB- VLB of the antenna element illustrated in Figure 10 A;
  • Figure 10D illustrates a side-view of an embodiment of an antenna element in accordance with the present invention
  • Figure 12B illustrates a side-view of another embodiment of an antenna element in accordance with the present invention.
  • Figure 13 A illustrates a side-view of an embodiment of an antenna element arrangement in accordance with the present invention
  • Figure 15 A illustrates a top view of an embodiment of an antenna element arrangement in accordance with the present invention
  • Figure 15B illustrates a top view of another embodiment of an antenna element arrangement in accordance with the present invention
  • Figure 17 illustrates a top view of still another embodiment of an antenna element arrangement in accordance with the present invention.
  • Figure 25 illusfrates a multimode antenna in accordance with another embodiment of the present invention.
  • Figures 33 A-B illustrate an antenna in accordance with an embodiment of the present invention with conductors formed on the edge as well as the face of a subsfrate.
  • K m od a i is defined by the mode volume Vi and the corresponding mode bandwidth:
  • Figure 7B illustrates a variety of ridged patterns which may be applied to the bottom portion 64 of the antenna element 58 illustrated in Figure 7 A. As illustrated in Figure 7B, the size and shape of the ridges may be varied to achieve desired performance characteristics of the antenna element.
  • Figure 7C illusfrates another embodiment of an CLMD antenna element with improved performance without increasing or modifying the footprint.
  • the antenna element 66 illusfrated in Figure 7C includes a top portion 68 and a middle portion 70 similar to those described above.
  • the antenna element 66 includes a bottom portion 72 having block ridges formed thereon. As illustrated in Figure 7D, the block ridges may be formed of a variety of shapes and sizes to provide the desired performance characteristics for the antenna element 66.
  • FIG. 9D illustrates an RF schematic of the embodiment illusfrated in Figure 9C.
  • FIGS 12A-12D illusfrate further embodiments of antenna elements in accordance with the present invention.
  • the illustrated embodiments provide antenna elements with reduced sizes (or footprints) without a decrease in performance.
  • Figure 13B illustrates an antenna element 220 with a top portion 222, a middle portion 224 and a bottom portion 226.
  • the antenna element 220 is positioned atop a ground plane 228 and is grounded through a ground pad 230.
  • the bottom portion 226 of the antenna element 220 is contoured to accommodate a shield 232 between the ground plane 228 and a portion of the bottom portion 226.
  • the bottom portion 226 is provided with a raised central region, allowing the shield 232 to be positioned between the central region of the bottom portion 226 and the ground plane 228.
  • Figure 13D illustrates an antenna element 250 with a top portion 252, a middle portion 254 and a bottom portion 256.
  • the antenna element 250 is positioned atop a ground plane 258 and is grounded through an extended ground pad 260.
  • the bottom portion 256 of the antenna element 250 is entirely raised above the ground plane 258.
  • a shield 262 is positioned between the bottom portion 256 and the ground plane 258 to provide improved shielding of the antenna element 250.
  • the shield 248 extends beyond one side of the bottom portion 240 to provide improved isolation of the antenna element 250.
  • FIG 17 illustrates another embodiment of an antenna element arrangement in accordance with the present invention.
  • a CLMD antenna element 326 is positioned in a coplanar manner with a ground plane 328 to provide a low profile.
  • the antenna element 326 includes a top portion 330, a middle portion 332 and a bottom portion 334.
  • a component 336 is positioned in the region between the middle portion 332 and the bottom portion 334.
  • the component may be any component such as electrical components including passive and active components such as capacitors, resistors and chipsets.
  • the component may be positioned between the top plate 330 and the middle plate 332.
  • more than one component may be positioned within the antenna element. In this manner, the footprint of the antenna element may be used to accommodate the components, thereby conserving valuable space in small devices.
  • portions 501, 502, 503, 511, 512 may be disposed relative to each other and/or grounding plane 506 in other geometrical relationships and with other geometries.
  • first portion 501 may be coupled to third portion 503, and third portion 503 may be coupled to second portion 502 by respective coupling portions 511 and 512 such that one or more of the portions are disposed relative to each other in non-parallel, non-orthogonal, and/or non-coplanar relationships.
  • portions 501, 502, 503, 511, and 512 may comprise conductors.
  • the conductors may be shaped to comprise one or more geometry, for example, cylindrical, planar, etc., or other geometries known to those skilled in the art.
  • the conductors may be flexible, rigid, or a combination thereof.
  • the first portion 501 is coupled to the third portion 503 by a first coupling portion 511
  • the third portion 503 is coupled to a second portion 502 by a second coupling portion 512
  • antenna 598 comprises a feed line 508 coupled to the third portion 503 where input or output signals are provided.
  • third portion 503 may be disposed in a plane that his generally coplanar with, or above, a grounding plane 506. Ln one embodiment, third portion 503 may be electrically isolated from the grounding plane 506 other than where third portion 503 is coupled to grounding plane 506 at grounding point 507. It is identified that third portion 503 may include one or more portion that comprises or is coupled to comprise other geometries, for example, a linear geometry, a curved geometry, a combination thereof, etc.
  • the capacitance of antenna 597 maybe increased over that of the capacitance of antenna 599.
  • an antenna 597 that has an equivalent capacitance may be provided to comprise a smaller form-factor/profile.
  • Figure 24 illustrates a dual-mode antenna based on the same principles as the antenna shown in Figure 23.
  • a second antenna element is placed inside the first antenna element described above. This allows tuning one to a certain frequency fi and the other one to another frequency f 2 .
  • the two antennas have a common ground, but different capacitive and inductive elements.
  • Figure 25 illustrates a multimode antenna with shared inductances ⁇ ⁇ and L 2 . and discrete capacitances Ci, C 2j and C 3 .
  • the antenna comprises several antenna elements.
  • the E-plane of a linearly polarized antenna contains the electric field vector of the antenna and the direction of maximum radiation.
  • the E-plane is orthogonal to the H-plane, i.e. the plane containing the magnetic field.
  • the H-plane contains the magnetic field vector and the direction of maximum radiation.
  • Each of elongated conductors 716 and 718 are electrically connected to the planar conductor 714 by respective connecting conductors 720 and 722.
  • Antenna 710 comprises elongated conductors 716 and 718 that are in the same or substantially the same plane as the planar conductor 714.
  • the gap between the elongated conductor 716 and the elongated conductor 718 is the region of capacitance.
  • the gap between the elongated conductor 716 and the planar conductor 714 is the region of inductance.
  • the space between the first elongated conductor 716 and the second elongated conductor 718 is much less than the space between the first elongated conductor 716 and the planar conductor 714.
  • the antenna structures in accordance with the principles of the present invention may be made by any means known in the art such as the use of traditional circuit printing.
  • Figure 45 illusfrates an alternative method for fabricating an antenna in accordance with the present invention. Rather than etching the antenna pattern on a printed circuit board, here the antenna is etched on a metallic film that is then molded in plastic. The resulting structure may be attached in various ways to a circuit board or to a device enclosure.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

L'invention concerne des modes de réalisation d'éléments d'antenne et d'ensembles d'éléments d'antenne qui offrent un profil généralement bas, une meilleure isolation et une plus grande bande passante. Certains éléments d'antenne selon l'invention offrent une réduction au niveau de leur empreinte tout en conservant les caractéristiques de performance en fournissant une plus grande surface sur une partie supérieure, intermédiaire ou inférieure d'une antenne CLMD. Divers modes résonnants d'une structure d'antenne multirésonante partagent au moins des parties du volume de cette structure. D'autres ensembles d'éléments d'antenne selon l'invention offrent une meilleure efficacité de rayonnement en fournissant des réflecteurs métalliques sur les côtés des éléments d'antenne. Les caractéristiques d'isolation de certains éléments d'antenne selon l'invention sont améliorées grâce à l'utilisation de guides d'ondes coplanaires. On peut améliorer la bande passante en utilisant des résonateurs à tronçons. On peut améliorer la bande passante des éléments d'antenne sans réduire l'isolation ou le blindage en prévoyant un intervalle variable entre deux parties des éléments d'antenne.
EP03808509A 2002-12-17 2003-12-17 Antennes a encombrement reduit et performance amelioree Withdrawn EP1579529A4 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US10/322,196 US7084813B2 (en) 2002-12-17 2002-12-17 Antennas with reduced space and improved performance
US322196 2002-12-17
US375423 2003-02-27
US10/375,423 US8059047B2 (en) 2003-02-27 2003-02-27 Capacitively loaded dipole antenna optimized for size
US10/643,102 US7616164B2 (en) 2003-02-27 2003-08-18 Optimized capacitive dipole antenna
US643102 2003-08-18
PCT/US2003/040663 WO2004057698A2 (fr) 2002-12-17 2003-12-17 Antennes a encombrement reduit et performance amelioree

Publications (2)

Publication Number Publication Date
EP1579529A2 EP1579529A2 (fr) 2005-09-28
EP1579529A4 true EP1579529A4 (fr) 2007-09-19

Family

ID=32685974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03808509A Withdrawn EP1579529A4 (fr) 2002-12-17 2003-12-17 Antennes a encombrement reduit et performance amelioree

Country Status (3)

Country Link
EP (1) EP1579529A4 (fr)
AU (1) AU2003303179A1 (fr)
WO (1) WO2004057698A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101911388B (zh) * 2008-01-08 2014-04-09 Ace技术株式会社 多频段内置天线
KR100981883B1 (ko) * 2008-04-30 2010-09-14 주식회사 에이스테크놀로지 지연파 구조를 이용한 광대역 내장형 안테나
GB2500136B (en) * 2010-10-15 2015-02-18 Microsoft Corp Parasitic folded loop antenna

Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4218682A (en) * 1979-06-22 1980-08-19 Nasa Multiple band circularly polarized microstrip antenna
US4389651A (en) * 1981-05-04 1983-06-21 Tomasky Philip P Triangular antenna
US4940992A (en) * 1988-04-11 1990-07-10 Nguyen Tuan K Balanced low profile hybrid antenna
WO1995024746A1 (fr) * 1994-03-08 1995-09-14 Cetelco Cellular Telephone Company A/S Appareil emetteur et/ou recepteur portatif
JPH07303005A (ja) * 1994-03-10 1995-11-14 Nippondenso Co Ltd 車両用アンテナ装置
US5781158A (en) * 1995-04-25 1998-07-14 Young Hoek Ko Electric/magnetic microstrip antenna
EP0884796A2 (fr) * 1997-06-11 1998-12-16 Matsushita Electric Industrial Co., Ltd. Antenne comprenant de portions courbés ou incurvés
EP0938158A2 (fr) * 1998-02-20 1999-08-25 Nokia Mobile Phones Ltd. Antenne
WO1999043043A1 (fr) * 1998-02-19 1999-08-26 Ericsson, Inc. Antenne plan a deux bandes a reception simultanee possedant un element rayonnant passif
US5966097A (en) * 1996-06-03 1999-10-12 Mitsubishi Denki Kabushiki Kaisha Antenna apparatus
JP2000068736A (ja) * 1998-08-21 2000-03-03 Toshiba Corp 多周波アンテナ
US6037905A (en) * 1998-08-06 2000-03-14 The United States Of America As Represented By The Secretary Of The Army Azimuth steerable antenna
EP1024552A2 (fr) * 1999-01-26 2000-08-02 Siemens Aktiengesellschaft Antenne pour terminaux de radiocommunication sans fil
EP1067627A1 (fr) * 1999-07-09 2001-01-10 Robert Bosch Gmbh Appareil de radiocommunication à deux bandes
EP1079463A2 (fr) * 1999-08-24 2001-02-28 Rangestar International Corporation Antenne dipôle asymétrique
WO2002035810A1 (fr) * 2000-10-25 2002-05-02 Siemens Aktiengesellschaft Terminal de communication
US20020089453A1 (en) * 2001-01-10 2002-07-11 Wen-Jen Tseng Multi-frequency band antenna
US6424539B1 (en) * 2001-07-20 2002-07-23 Hon Hai Precision Ind. Co., Ltd. Low profile GBIC guide rail assembly
US6456243B1 (en) * 2001-06-26 2002-09-24 Ethertronics, Inc. Multi frequency magnetic dipole antenna structures and methods of reusing the volume of an antenna
WO2002078123A1 (fr) * 2001-03-23 2002-10-03 Telefonaktiebolaget L M Ericsson (Publ) Systeme multi-bande, multi-antenne integre

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE794982A (fr) * 1972-02-08 1973-05-29 Atomic Energy Commission Antenne d'emission de type shunt alimentee par une extremite
EP0584882A1 (fr) * 1992-08-28 1994-03-02 Philips Electronics Uk Limited Antenne-cadre

Patent Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4218682A (en) * 1979-06-22 1980-08-19 Nasa Multiple band circularly polarized microstrip antenna
US4389651A (en) * 1981-05-04 1983-06-21 Tomasky Philip P Triangular antenna
US4940992A (en) * 1988-04-11 1990-07-10 Nguyen Tuan K Balanced low profile hybrid antenna
WO1995024746A1 (fr) * 1994-03-08 1995-09-14 Cetelco Cellular Telephone Company A/S Appareil emetteur et/ou recepteur portatif
JPH07303005A (ja) * 1994-03-10 1995-11-14 Nippondenso Co Ltd 車両用アンテナ装置
US5781158A (en) * 1995-04-25 1998-07-14 Young Hoek Ko Electric/magnetic microstrip antenna
US5966097A (en) * 1996-06-03 1999-10-12 Mitsubishi Denki Kabushiki Kaisha Antenna apparatus
EP0884796A2 (fr) * 1997-06-11 1998-12-16 Matsushita Electric Industrial Co., Ltd. Antenne comprenant de portions courbés ou incurvés
WO1999043043A1 (fr) * 1998-02-19 1999-08-26 Ericsson, Inc. Antenne plan a deux bandes a reception simultanee possedant un element rayonnant passif
EP0938158A2 (fr) * 1998-02-20 1999-08-25 Nokia Mobile Phones Ltd. Antenne
US6037905A (en) * 1998-08-06 2000-03-14 The United States Of America As Represented By The Secretary Of The Army Azimuth steerable antenna
JP2000068736A (ja) * 1998-08-21 2000-03-03 Toshiba Corp 多周波アンテナ
EP1024552A2 (fr) * 1999-01-26 2000-08-02 Siemens Aktiengesellschaft Antenne pour terminaux de radiocommunication sans fil
EP1067627A1 (fr) * 1999-07-09 2001-01-10 Robert Bosch Gmbh Appareil de radiocommunication à deux bandes
EP1079463A2 (fr) * 1999-08-24 2001-02-28 Rangestar International Corporation Antenne dipôle asymétrique
WO2002035810A1 (fr) * 2000-10-25 2002-05-02 Siemens Aktiengesellschaft Terminal de communication
US20020089453A1 (en) * 2001-01-10 2002-07-11 Wen-Jen Tseng Multi-frequency band antenna
WO2002078123A1 (fr) * 2001-03-23 2002-10-03 Telefonaktiebolaget L M Ericsson (Publ) Systeme multi-bande, multi-antenne integre
US6456243B1 (en) * 2001-06-26 2002-09-24 Ethertronics, Inc. Multi frequency magnetic dipole antenna structures and methods of reusing the volume of an antenna
US6424539B1 (en) * 2001-07-20 2002-07-23 Hon Hai Precision Ind. Co., Ltd. Low profile GBIC guide rail assembly

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
FU J S ET AL: "COMPOUND DIPOLE WITH H-PLANE PARASITIC POSTS FOR PHASED ARRAY WIDE-ANGLE WIDE-BAND SCANNING", RECORD OF THE 1999 IEEE RADAR CONFERENCE. WALTHAM, MA, APRIL 20 - 22, 1999, IEEE RADAR CONFERENCE, NEW YORK, NY : IEEE, US, 20 April 1999 (1999-04-20), pages 22 - 26, XP000895715, ISBN: 0-7803-4978-4 *
See also references of WO2004057698A2 *

Also Published As

Publication number Publication date
AU2003303179A1 (en) 2004-07-14
WO2004057698A9 (fr) 2004-08-12
AU2003303179A8 (en) 2004-07-14
WO2004057698A3 (fr) 2006-06-29
WO2004057698A2 (fr) 2004-07-08
EP1579529A2 (fr) 2005-09-28

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