EP0056923B1 - Antenne de petite dimension - Google Patents

Antenne de petite dimension Download PDF

Info

Publication number
EP0056923B1
EP0056923B1 EP81402082A EP81402082A EP0056923B1 EP 0056923 B1 EP0056923 B1 EP 0056923B1 EP 81402082 A EP81402082 A EP 81402082A EP 81402082 A EP81402082 A EP 81402082A EP 0056923 B1 EP0056923 B1 EP 0056923B1
Authority
EP
European Patent Office
Prior art keywords
metal
receiver
metal plate
box
antenna
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
Application number
EP81402082A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0056923A3 (en
EP0056923A2 (fr
Inventor
Albert Boubouleix
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0056923A2 publication Critical patent/EP0056923A2/fr
Publication of EP0056923A3 publication Critical patent/EP0056923A3/fr
Application granted granted Critical
Publication of EP0056923B1 publication Critical patent/EP0056923B1/fr
Expired legal-status Critical Current

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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
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/273—Adaptation for carrying or wearing by persons or animals
    • 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
    • H01Q9/40—Element having extended radiating surface

Definitions

  • the present invention relates to an antenna, and more particularly a small antenna intended to equip a portable receiver.
  • small antenna is understood to mean an antenna whose dimension is much less than the wavelength of the waves received.
  • the antenna is traditionally made up of two metal plates, forming an electrical dipole, between which the receiver is interposed, an adaptation circuit generally constituted by an inductor, being provided between the receiver and each of the metal plates constituting the dipole.
  • the poles of the dipole forming the antenna consist of two housings separated by an insulator, the coupling of the dipole to the circuits of the radio station being carried out using a transformer.
  • the device described however has the drawbacks of remaining bulky and of requiring a conductive screen to protect the radio receiver against the effects varying the capacitance produced by mobile objects near the receiver.
  • the present invention aims to overcome the aforementioned drawbacks.
  • the subject of the invention is a small antenna forming an electrical dipole and intended to equip a portable radio receiver, characterized in that the first pole of the electrical dipole is constituted by a metal box in which are housed the the set of components of the radio receiver and which forms a zero electric field reference potential plane for the receiver, the second pole of the electric dipole is formed by a metal plate connected to the components of the radio receiver, the metal plate being fixed spaced apart and facing a face of the metal box so that the space between the metal plate and the facing face of the metal box has a value much less than the reception wavelength of the radio receiver, the dipole formed by the metal box and the metal plate being such that the plane of the reference potential of the first pole is located at half the distance separating the face of the box directly in look of the metal plate from that of the case opposite it.
  • An inductor 4 intended to ensure the adaptation of the antenna of the receiver, is provided with a first terminal connected to the plate 1 and a second terminal connected to a first input of an amplifier (not shown in the figure 1) located inside the metal housing and forming part of the input stage of the receiver, a second input of this amplifier being connected to the housing.
  • the antenna thus constituted behaves like an electric dipole comprising, as shown in FIG. 2, a first metal plate constituted by plate 1 and a second metal plate constituted by a virtual metal plate 5 located at mid -height (2) of the housing 2.
  • FIG. 3 representing the equipotential lines obtained around the antenna according to the invention when the latter is placed in a uniform electric field, in a rheographic tank.
  • aa ' shows that the electric field which bypasses the housing from below is not used.
  • the electric field is zero towards the middle of the box (points 0 and 0 ').
  • the tangential component of the electric field is zero at the limit of the box.
  • the structure of this antenna has several advantages over the structure of the antenna traditionally used.
  • a first advantage is that the size is reduced. More precisely, the height of the antenna and housing assembly is reduced by a height equal to L.
  • a second advantage is that we save inductances. In fact, before, the signals supplied by the two metal plates were in phase opposition. It was therefore necessary to provide a mid-point transformer consisting of a first winding provided with a first terminal connected to the first plate, a second terminal connected to the second plate, and a second winding provided with a first terminal connected to the input of an amplifier forming part of the input stage of the receiver and of a second terminal set to a reference potential, the midpoint of the first winding being also set to this reference potential.
  • the second antenna plate according to the invention consists of the receiver housing. It therefore suffices to connect the first terminal of the amplifier to the plate 1 via the inductor 4, and a second terminal of the amplifier to the housing 2 which by definition constitutes a reference potential.
  • a third advantage is that the metallization of the receiver housing provides impermeability to stray electric fields. The electronic circuits constituting the receiver are thus protected from direct coupling with the external environment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
EP81402082A 1981-01-23 1981-12-28 Antenne de petite dimension Expired EP0056923B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8101291A FR2498819B1 (fr) 1981-01-23 1981-01-23 Antenne de petite dimension
FR8101291 1981-01-23

Publications (3)

Publication Number Publication Date
EP0056923A2 EP0056923A2 (fr) 1982-08-04
EP0056923A3 EP0056923A3 (en) 1982-08-11
EP0056923B1 true EP0056923B1 (fr) 1986-10-08

Family

ID=9254457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81402082A Expired EP0056923B1 (fr) 1981-01-23 1981-12-28 Antenne de petite dimension

Country Status (5)

Country Link
US (1) US4491843A (da)
EP (1) EP0056923B1 (da)
DE (1) DE3175454D1 (da)
DK (1) DK21382A (da)
FR (1) FR2498819B1 (da)

Families Citing this family (36)

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DE3214449A1 (de) * 1982-04-20 1983-10-27 Standard Elektrik Lorenz Ag, 7000 Stuttgart Miniaturisierter funkempfaenger
DE3302876A1 (de) * 1983-01-28 1984-08-02 Robert Bosch Gmbh, 7000 Stuttgart Dipolantenne fuer tragbare funkgeraete
US6822553B1 (en) 1985-10-16 2004-11-23 Ge Interlogix, Inc. Secure entry system with radio reprogramming
US5475375A (en) * 1985-10-16 1995-12-12 Supra Products, Inc. Electronic access control systems
US6072402A (en) * 1992-01-09 2000-06-06 Slc Technologies, Inc. Secure entry system with radio communications
US4740794A (en) * 1986-01-03 1988-04-26 Motorola, Inc. Connectorless antenna coupler
US4831661A (en) * 1986-10-09 1989-05-16 Toko Kabushiki Kaisha RF tuning circuit
US4790030A (en) * 1986-11-25 1988-12-06 Rca Licensing Corporation Tuner with insertable antenna coupler
US4876552A (en) * 1988-04-27 1989-10-24 Motorola, Inc. Internally mounted broadband antenna
FI81927C (fi) * 1988-10-26 1990-12-10 Nokia Mobira Oy Antenn foer radiotelefon.
GB2237449B (en) * 1989-09-30 1994-03-30 Hi Trak Systems Ltd Transmitter and antenna
DE4113277C2 (de) * 1991-04-19 1996-08-08 Hagenuk Telecom Gmbh Antenne für ein mobiles Telefon
JP3251680B2 (ja) * 1991-12-26 2002-01-28 株式会社東芝 携帯無線機
BR9207033A (pt) * 1992-01-09 1995-12-05 Supra Prod Inc Sistema de entrada de segurança com radiocomunicação
TW320813B (da) * 1996-04-05 1997-11-21 Omron Tateisi Electronics Co
JP3838815B2 (ja) * 1999-05-10 2006-10-25 日本電気株式会社 携帯電話機
AU5377300A (en) * 1999-06-02 2000-12-28 University Of Waterloo Flat-plate monopole antennae
US6281851B1 (en) 2000-01-21 2001-08-28 Motorola, Inc. Antenna assembly and communication device utilizing such antenna assembly
US6266019B1 (en) * 2000-07-21 2001-07-24 Ericsson Inc. System for increasing antenna efficiency
GB0019335D0 (en) * 2000-08-08 2000-09-27 Koninkl Philips Electronics Nv Wireless terminal
CN100481611C (zh) * 2000-08-08 2009-04-22 Nxp股份有限公司 无线终端
SE522492C2 (sv) 2000-10-27 2004-02-10 Ericsson Telefon Ab L M Antennanordning för en mobilterminal
US6660948B2 (en) 2001-02-28 2003-12-09 Vip Investments Ltd. Switch matrix
EP1251584B1 (en) * 2001-04-19 2003-11-26 TELEFONAKTIEBOLAGET L M ERICSSON (publ) End-fed Antenna for a mobile terminal
US6950070B2 (en) * 2001-04-19 2005-09-27 Telefonaktiebolaget Lm Ericsson Arrangement for a mobile terminal
GB0112265D0 (en) * 2001-05-19 2001-07-11 Koninkl Philips Electronics Nv Antenna arrangement
US7394451B1 (en) 2003-09-03 2008-07-01 Vantage Controls, Inc. Backlit display with motion sensor
US7307542B1 (en) 2003-09-03 2007-12-11 Vantage Controls, Inc. System and method for commissioning addressable lighting systems
US7755506B1 (en) 2003-09-03 2010-07-13 Legrand Home Systems, Inc. Automation and theater control system
US7778262B2 (en) * 2005-09-07 2010-08-17 Vantage Controls, Inc. Radio frequency multiple protocol bridge
US8237615B2 (en) 2008-08-04 2012-08-07 Fractus, S.A. Antennaless wireless device capable of operation in multiple frequency regions
WO2010015365A2 (en) 2008-08-04 2010-02-11 Fractus, S.A. Antennaless wireless device
WO2011095330A1 (en) 2010-02-02 2011-08-11 Fractus, S.A. Antennaless wireless device comprising one or more bodies
WO2012017013A1 (en) 2010-08-03 2012-02-09 Fractus, S.A. Wireless device capable of multiband mimo operation
US9653806B2 (en) 2011-07-18 2017-05-16 Sony Corporation Multi-band wireless terminals with metal backplates and coupling feed elements, and related multi-band antenna systems
JP7224716B2 (ja) * 2017-03-29 2023-02-20 株式会社ヨコオ アンテナ装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2828413A (en) * 1956-06-21 1958-03-25 Bell Telephone Labor Inc Self-contained antenna-radio system in which a split conductive container forms a dipole antenna
FR1175744A (fr) * 1956-06-21 1959-04-01 Western Electric Co Appareil de radio à antenne incorporée
US3573628A (en) * 1968-07-15 1971-04-06 Motorola Inc Antenna for miniature radio receiver including portions of receiver housing and chassis
US3545002A (en) * 1969-02-04 1970-12-01 Sperry Rand Corp Wideband wave trapping antenna having a time limited impulse response
US3587107A (en) * 1969-06-11 1971-06-22 Sperry Rand Corp Time limited impulse response antenna
US3736591A (en) * 1970-10-30 1973-05-29 Motorola Inc Receiving antenna for miniature radio receiver
US3852760A (en) * 1973-08-07 1974-12-03 Us Army Electrically small dipolar antenna utilizing tuned lc members
DE2408578C2 (de) * 1974-02-22 1985-06-27 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Antenne mit quadratischer ebener Leiterfläche und paralleler leitender Grundfläche
US3980952A (en) * 1975-04-07 1976-09-14 Motorola, Inc. Dipole antenna system having conductive containers as radiators and a tubular matching coil
JPS583405B2 (ja) * 1976-09-24 1983-01-21 日本電気株式会社 小型無線機用アンテナ
US4171423A (en) * 1977-09-29 1979-10-16 Union Carbide Corporation Derivatives of ester diol alkoxylates and compositions thereof

Also Published As

Publication number Publication date
DK21382A (da) 1982-07-24
FR2498819A1 (fr) 1982-07-30
EP0056923A3 (en) 1982-08-11
US4491843A (en) 1985-01-01
DE3175454D1 (en) 1986-11-13
EP0056923A2 (fr) 1982-08-04
FR2498819B1 (fr) 1985-05-31

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