EP1188200B1 - Antenne unipolaire plate - Google Patents

Antenne unipolaire plate Download PDF

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Publication number
EP1188200B1
EP1188200B1 EP00938358A EP00938358A EP1188200B1 EP 1188200 B1 EP1188200 B1 EP 1188200B1 EP 00938358 A EP00938358 A EP 00938358A EP 00938358 A EP00938358 A EP 00938358A EP 1188200 B1 EP1188200 B1 EP 1188200B1
Authority
EP
European Patent Office
Prior art keywords
radiating plate
antenna
inductors
casing
wireless communications
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.)
Expired - Lifetime
Application number
EP00938358A
Other languages
German (de)
English (en)
Other versions
EP1188200A1 (fr
Inventor
Nader Fayyaz
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.)
University of Waterloo
Original Assignee
University of Waterloo
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 University of Waterloo filed Critical University of Waterloo
Publication of EP1188200A1 publication Critical patent/EP1188200A1/fr
Application granted granted Critical
Publication of EP1188200B1 publication Critical patent/EP1188200B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • 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
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/38—Vertical arrangement of element with counterpoise
    • 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
    • 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
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/36—Vertical arrangement of element with top loading

Definitions

  • the present invention relates to a flat-plate antennae.
  • the present invention relates to a flat-plate monopole antennae suitable for use with mobile wireless communications devices.
  • the conventional cellular monopole antennae comprises a tubular antennae element grounded to the casing of the cellular telephone, and a metal rod disposed within the grounded tubular antennae element.
  • the monopole antennae must generally be considerably longer than the length of the casing of the cellular telephone. Since a long monopole antennae would inhibit the portability of the cellular telephone, the monopole antennae is typically fabricated as a series of telescoping monopole antennae sections which allow the monopole antennae to be retracted into the telephone casing when the cellular telephone is not in use. However, the monopole antennae must still be extended to obtain the required gain and bandwidth characteristics for cellular communication. Accordingly, attempts have been made to reduce the size of the monopole antennae without compromising antennae gain and bandwidth.
  • Yokoyama US 4,791,423 teaches a microstrip antennae suitable for use with a mobile telephone.
  • the microstrip antennae comprises a first grounding rectangular conductive sheet, a radiating rectangular conductive sheet parallel to the grounding conductive sheet, a feed pin disposed within the substrate between the first grounding conductive sheet and the radiating conductive sheet, and second and third grounding conductive sheets disposed at opposite ends of the first grounding conductive sheet and being perpendicular to the first grounding conductive sheet and the radiating conductive sheet sleeve so as to improve the beam tilt characteristics of the antennae.
  • the second grounding conductive sheet functions as a connecting conductive sheet connecting the first grounding conductive sheet to the radiating conductive sheet.
  • the patch antenna includes a planar passive element disposed above and in close proximity to the radiating conductive sheet for facilitating impedance matching of the antenna.
  • Nakase (US 5,061,939) teaches a flat-plate antenna suitable for use with a mobile telephone.
  • the flat-plate antenna comprises a rectangular conductive ground plate, a radiating oval-shaped conductive top plate parallel to the ground plate, a plurality of elongated connecting members disposed between the ground plate and the top plate for electrically connecting the top plate to the ground plate, and a stripline resonator disposed between the ground plate and the top plate.
  • the stripline resonator includes a feeder line, and a capacitor electrode centrally disposed below the top plate for adjusting the resonant frequency of the antenna.
  • Yokoyama (US 5,148,181) teaches a mobile radio communications device having an antenna for preventing the antenna gain from being reduced by the user's head and/or hands during operation of the communications device.
  • the antenna is mounted on the upper surface of the casing of the communications device, and comprises a rectangular first conductive plate, a rectangular second conductive plate disposed below and extending parallel to the first conductive plate, and a rectangular third conductive plate extending perpendicularly from the first and second conductive plates.
  • the first conductive plate is spaced a distance from the upper surface of the casing of the communications device.
  • the antenna also includes a short circuit plate extending perpendicularly from the first conductive plate and is connected to the upper surface of the casing in proximity othe location of the earpiece and the mouthpiece.
  • Boubouleix (US 4,491,843) teaches a dipole antenna comprising a parallelopiped-shaped metal box, an amplifier disposed within the metal box, a metal plate disposed in proximity to the top end surface of the metal box, and an inductor extending through the upper end surface.
  • the inductor is connected at one end to the metal plate and at the opposite end to the amplifier.
  • a monopole antenna comprising a parallelepiped-shaped metal box, a metal plate and a coaxial feed probe.
  • the metal box has an upper planar grounding surface, and the metal plate is disposed in proximity to the grounding surface.
  • the coaxial feed probe extends through the grounding surface of the metal box.
  • the centre conductor of the probe is connected at one end to the centre of the metal plate.
  • the outer conductor of the probe is connected at one end to the metal plate, and at the opposite end to the grounding surface.
  • Yokoyama, Nakase, Boubouliex and Delariad provide an antenna which is significantly smaller than the conventional telescoping monopole antenna.
  • the bandwidth, resonant frequency and input impedance characteristics of the antenna are dictated by fixed parameters such as the dimensions of the conductive plates, and the distance between the conductive plates.
  • close attention must be paid to manufacturing tolerances to attain the proper operating characteristics for the antenna. Therefore, there remains a need for a monopole antenna which is significantly smaller than the conventional monopole telescoping antennae, and whose operating characteristics are not compromised by variations from manufacturing tolerances.
  • a wireless communications device and monopole antenna which address deficiencies of the prior art monopole antennae.
  • the monopole antenna includes a conductive ground plane, a conductive radiating plate, an antennae interface terminal, and a resonant network for defining operating characteristics of the antennae.
  • the conductive radiating plate is spaced apart from the ground plane and, together with the ground plane, defines a cavity therebetween.
  • the antennae interface terminal is in communication with the cavity and is electrically isolated from the ground plane and the radiating plate.
  • the resonant network includes an inductive element electrically coupled between the interface terminal and the radiating plate.
  • the wireless communications device includes a conductive casing for receiving wireless communications hardware therein; a conductive radiating plate spaced apart from the casing and, together with the ground plane, defining an antenna; and a resonant network for defining operating characteristics of the antennae.
  • the conductive casing includes an antenna communication port for interfacing with the communications hardware.
  • the resonant network includes an inductive element electrically coupled between the communication port and the radiating plate.
  • the inductive element is disposed within the cavity and comprises a first air-core coiled wire inductor electrically coupled between the radiating plate and the interface terminal, and a second air-core coiled wire inductor electrically coupled between the interface terminal and the ground plane.
  • Each inductor has a number of wire turns, and the resonant network provides the antenna with a resonant frequency determined in accordance with the number of wire turns.
  • a wireless communications device denoted generally as 100, comprising a conductive casing 102, a conductive radiating plate 104 spaced apart from the casing 102, and a cavity 106 defined between the casing 102 and the radiating plate 104.
  • the casing 102 has a generally rectangular parallelopiped shape, configured for receiving wireless communications circuitry therein, and includes a pair of opposite faces 108a, 108b, a pair of opposite sides 110a, 110b, and a pair of opposite ends 112a, 112b.
  • the casing 102 is shaped as a wireless telephone handset, and the wireless communications circuitry housed within the casing 102 operates as a wireless telephone.
  • the casing 102 may adopt other shapes and the wireless communications circuitry may function other than as a wireless telephone, as the application demands.
  • the casing 102 includes an antenna communication port 114, and an antenna interface terminal 116 extending through the communication port 114.
  • the interface terminal 116 extends into the cavity 106, and is electrically isolated from the casing 102 and the radiating plate 104.
  • the interface terminal 116 interfaces with the communications hardware disposed within the casing 102, and allows the communications hardware to transmit and receive data as electromagnetic waves.
  • the radiating plate 104 cooperates with the casing 102 to define a monopole antenna, with the casing 102 acting as the conductive ground plane for the antenna.
  • the radiating plate 104 comprises a rectangular planar conductive plate fabricated from copper or aluminum.
  • the radiating plate 104 may adopt any other shape suitable for proper antenna operation. For instance, in one variation, shown in Fig. 3, the radiating plate is fabricated with an arcuate shape. Further, the radiation plate 104 may have the same or different dimensions as the casing 102.
  • the radiating plate 104 is oriented substantially parallel to the casing ends 112 and at right angles to the casing faces 108.
  • the radiating plate 104 may also be disposed at other angles relative to the casing faces 108 so as to alter the antenna pattern of the monopole antenna.
  • a wireless communications device 100' in which the end 112a' and the radiating plate 104 are inclined relative to the casing faces 108.
  • the radiating plate 104 may be inclined slightly with respect to the casing end 112a.
  • the wireless communication device 100 also includes a resonant network 118 which, in conjunction with the dimensions of the radiating plate 104 and the cavity 106, defines the operating characteristics of the monopole antennae.
  • the resonant network 118 is disposed within the cavity 106, and includes an inductive antenna element electrically coupled to the interface terminal 116, the radiating plate 104 and the casing 102.
  • the resonant network 118 is not limited to including only a single inductive antenna element.
  • the resonant network 118 in order to increase the bandwidth of the antenna, includes a plurality of distinct inductive antenna elements, each being electrically connected to the interface terminal 116 and respective locations on the radiating plate 104 and the casing 102.
  • the inductive antenna element comprises a first inductor 120 electrically connected between the radiating plate 104 and the interface terminal 116, and a second inductor 122 electrically connected between the interface terminal 116 and the casing 102.
  • the first inductor 120 and the second inductor 122 are coupled together on a common core.
  • the resonant network 118 also includes a capacitive antenna element which is defined by the dimensions of the casing 102, the radiating plate 104 and the cavity 106.
  • the inductive antenna element is disposed in parallel with the capacitive antenna element, with the capacitive antenna element and the inductive antenna element together establishing a parallel resonant circuit.
  • the resonant frequency of the monopole antenna is determined in accordance with the capacitance of the capacitive antenna element and the inductance of the inductive antenna element.
  • the cavity 106 comprises an air cavity
  • the inductors 120, 122 comprise air-cored coiled wire inductors, each having a respective number of wire turns so that the resonant frequency of the monopole antenna is defined by the number of wire turns of each inductor 120, 122.
  • the cavity 106 may include a dielectric or a support structure which supports the radiating plate 104.
  • the wire used in the wire inductors 120, 122 comprises flexible wire so as to allow the distance between the radiating plate 104 and the end 112a (and therefore the capacitance of the capacitive antenna element) to be adjusted. In this manner, the resonant frequency of the monopole antenna can be adjusted to account for variations in manufacturing tolerances.
  • the input impedance of the monopole antenna is dictated by the number of wire turns (and hence the inductances) of the wire inductors 120, 122.
  • the capacitance of the capacitive antenna element is dictated by the size and shape of the radiation plate 104 and the casing 102. Accordingly, the present invention offers the significant advantage of allowing the input impedance of the monopole antennae to be matched to that of the wireless communications circuitry by adjusting the number of wire turns, while also allowing the resonant frequency and bandwidth of the antenna to be adjusted as desired by altering the dimensions of the radiation plate 104 and/or the casing 102. In each case, however, preferably the length and width of the radiation plate 104 and the end 112a remains less than 10% of the operating wavelength of the antenna at the resonant frequency.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Waveguide Aerials (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Claims (15)

  1. Antenne unipolaire plate comprenant :
    un plan de sol conducteur (112) ;
    une plaque rayonnante conductrice (104), distante du plan de sol (112) et délimitant avec le plan de sol et entre eux une cavité (106);
    un terminal d'interface (116) d'antenne en communication avec la cavité (106) et électriquement isolé du plan de sol et de la plaque rayonnante ; et
    un réseau de résonance (118) pour définir les caractéristiques de fonctionnement de l'antenne,
    caractérisée en ce que le réseau de résonance comprend un premier élément d'induction (120) électriquement couplé entre la plaque rayonnante et le terminal d'interface, et un second élément d'induction (122) électriquement couplé entre le terminal d'interface et le plan de sol.
  2. Antenne unipolaire selon la revendication 1, dans laquelle la plaque rayonnante et la cavité définissent un élément capacitif, et dans laquelle les éléments d'induction sont disposés en parallèle avec l'élément capacitif.
  3. Antenne unipolaire selon la revendication 1 ou 2, dans laquelle les éléments d'induction sont disposés à l'intérieur de la cavité.
  4. Antenne unipolaire selon l'une quelconque des revendications 1 à 3, dans laquelle au moins un des éléments d'induction comprend un élément d'induction à noyau d'air.
  5. Antenne unipolaire selon la revendication 1, dans laquelle les éléments d'induction comportent des bobines d'induction hélicoïdales, chacune desdites bobines d'induction hélicoïdales comprenant un certain nombre de spires, et dans laquelle le réseau de résonance établit l'antenne à une fréquence de résonance déterminée par le nombre de spires des bobines d'induction hélicoïdales.
  6. Antenne unipolaire selon l'une quelconque des revendications 1 à 5, dans laquelle le réseau de résonance comporte une pluralité d'éléments d'induction distincts qui sont chacun couplés électriquement au terminal d'interface en une position respective sur la plaque rayonnante.
  7. Antenne unipolaire selon l'une quelconque des revendications 1 à 6, dans laquelle la plaque rayonnante comporte une plaque rayonnante incurvée.
  8. Dispositif de communication sans fil (100) comprenant :
    un boítier conducteur (102) prévu pour recevoir à l'intérieur le matériel de communication sans fil, le boítier conducteur comprenant un port de communication par antenne (114) pour l'interface avec le matériel de communication ;
    une plaque rayonnante conductrice (104), distante du boítier et définissant une antenne avec le boítier ;
    un réseau de résonance pour définir les caractéristiques de fonctionnement de l'antenne, le réseau de résonance comprenant un premier élément d'induction (120) électriquement couplé entre la plaque rayonnante et le port de communication, et un second élément d'induction (122) électriquement couplé entre le port de communication et le boítier.
  9. Dispositif de communication sans fil selon la revendication 8, dans lequel le boítier, la plaque rayonnante et la cavité délimitent un élément capacitif, et dans lequel les éléments d'induction sont disposés en parallèle avec l'élément capacitif.
  10. Dispositif de communication sans fil selon l'une quelconque des revendications 8 à 9, dans lequel les éléments d'induction et le boítier délimitent entre eux une cavité, et dans lequel les éléments d'induction sont disposés à l'intérieur de la cavité.
  11. Dispositif de communication sans fil selon l'une quelconque des revendications 8 à 10, dans lequel au moins un des éléments d'induction comprend un élément d'induction à noyau d'air.
  12. Dispositif de communication sans fil selon la revendication 8, dans lequel les éléments d'induction comportent des bobines d'induction hélicoïdales, chacune desdites bobines d'induction hélicoïdales comprenant un certain nombre de spires, et dans lequel le réseau de résonance établit l'antenne à une fréquence de résonance déterminée par le nombre de spires des bobines d'induction hélicoïdales.
  13. Dispositif de communication sans fil selon l'une quelconque des revendications 7 à 12, dans lequel le réseau de résonance comporte une pluralité d'éléments d'induction distincts couplés chacun électriquement au port de communication et en une position respective sur la plaque rayonnante.
  14. Dispositif de communication sans fil selon l'une quelconque des revendications 7 à 13, dans lequel le boítier présente au moins une face, et dans lequel la plaque rayonnante est inclinée par rapport à cette au moins une face.
  15. Dispositif de communication sans fil selon l'une quelconque des revendications 7 à 14, dans lequel la plaque rayonnante comporte une plaque rayonnante incurvée.
EP00938358A 1999-06-02 2000-06-02 Antenne unipolaire plate Expired - Lifetime EP1188200B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US13751099P 1999-06-02 1999-06-02
US137510P 1999-06-02
PCT/CA2000/000635 WO2000076023A1 (fr) 1999-06-02 2000-06-02 Antenne unipolaire plate

Publications (2)

Publication Number Publication Date
EP1188200A1 EP1188200A1 (fr) 2002-03-20
EP1188200B1 true EP1188200B1 (fr) 2003-03-05

Family

ID=22477753

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00938358A Expired - Lifetime EP1188200B1 (fr) 1999-06-02 2000-06-02 Antenne unipolaire plate

Country Status (8)

Country Link
EP (1) EP1188200B1 (fr)
JP (1) JP2003501926A (fr)
KR (1) KR20020015694A (fr)
AT (1) ATE233959T1 (fr)
AU (1) AU5377300A (fr)
CA (1) CA2373768A1 (fr)
DE (1) DE60001571T2 (fr)
WO (1) WO2000076023A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1310014B1 (fr) * 2000-08-08 2007-05-30 Koninklijke Philips Electronics N.V. Terminal sans fil
GB0112265D0 (en) 2001-05-19 2001-07-11 Koninkl Philips Electronics Nv Antenna arrangement
KR100449428B1 (ko) * 2001-12-26 2004-09-18 한국전자통신연구원 타원 실린더형 복사체를 가지는 모노폴 안테나
DE10303456A1 (de) * 2003-01-29 2004-08-19 Fujitsu Siemens Computers Gmbh Elektrisches Gerät
KR100810291B1 (ko) 2003-09-08 2008-03-06 삼성전자주식회사 전자기적 결합 급전 소형 광대역 모노폴 안테나
KR100744810B1 (ko) * 2005-07-23 2007-08-01 엘지전자 주식회사 패치형 초광대역 안테나
CN102119467A (zh) 2008-08-04 2011-07-06 弗拉克托斯股份有限公司 无天线无线装置
WO2010015364A2 (fr) 2008-08-04 2010-02-11 Fractus, S.A. Dispositif sans fil sans antenne capable de fonctionner dans de multiples régions de fréquence
WO2011095330A1 (fr) 2010-02-02 2011-08-11 Fractus, S.A. Dispositif sans fil et sans antenne comprenant un ou plusieurs corps
CN103155276B (zh) 2010-08-03 2015-11-25 弗拉克托斯天线股份有限公司 能够进行多带mimo操作的无线装置
RU2486644C1 (ru) * 2012-02-03 2013-06-27 Открытое акционерное общество "Научно-исследовательский институт космического приборостроения" (ОАО "НИИ КП") Самолетная антенна
JP7224716B2 (ja) 2017-03-29 2023-02-20 株式会社ヨコオ アンテナ装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2498819B1 (fr) * 1981-01-23 1985-05-31 Thomson Csf Antenne de petite dimension

Also Published As

Publication number Publication date
CA2373768A1 (fr) 2000-12-14
WO2000076023A1 (fr) 2000-12-14
KR20020015694A (ko) 2002-02-28
EP1188200A1 (fr) 2002-03-20
JP2003501926A (ja) 2003-01-14
DE60001571T2 (de) 2003-09-25
DE60001571D1 (de) 2003-04-10
ATE233959T1 (de) 2003-03-15
AU5377300A (en) 2000-12-28

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