EP0546803A1 - Diversity-Antenne - Google Patents

Diversity-Antenne Download PDF

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Publication number
EP0546803A1
EP0546803A1 EP92311184A EP92311184A EP0546803A1 EP 0546803 A1 EP0546803 A1 EP 0546803A1 EP 92311184 A EP92311184 A EP 92311184A EP 92311184 A EP92311184 A EP 92311184A EP 0546803 A1 EP0546803 A1 EP 0546803A1
Authority
EP
European Patent Office
Prior art keywords
diversity antenna
antenna
locations
feed
switch
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Withdrawn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
EP92311184A
Other languages
English (en)
French (fr)
Inventor
Graham Edgar Beesley
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.)
Lucent Technologies Wireless Ltd
Original Assignee
AT&T Wireless Communications Products Ltd
Shaye Communications 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 AT&T Wireless Communications Products Ltd, Shaye Communications Ltd filed Critical AT&T Wireless Communications Products Ltd
Publication of EP0546803A1 publication Critical patent/EP0546803A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H01Q3/247—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching by switching different parts of a primary active element

Definitions

  • This invention relates to a diversity antenna, particularly for use in situations where space saving is paramount, for example in portable apparatus.
  • Diversity reception is the name given to reception by two or more spaced antennae in order to overcome propagation variations due to effects such as multipath reception and/or ionospheric variations and the like.
  • some form of switching arrangement is employed to rapidly switch between the antennae so that the resultant signal at the receiver is due to the time multiplexed signals from each of the antennae in turn.
  • the individual antenna are suitably positioned and spaced with respect to the incoming signal, the use of diversity can largely compensate for much signal path fading.
  • the diversity technique cannot usually be used because the size of the antenna system as a whole is clearly much larger than with a conventional single antenna.
  • a diversity effect is achieved with a single antenna element by driving the antenna element at two spaced locations such that the current peaks resulting therefrom are spaced apart.
  • the antenna acts, in effect, as two antennae spaced apart by the distance between the current peaks.
  • the antenna element is fed at either end alternately, diversity switching means being used to drive one end or the other. This switching can either be by way of continuous rapid switching, in the manner described above, or the switching may be carried out on an intelligent basis - i.e. only when needed due to signal conditions.
  • the antenna can be used for reception or transmission.
  • the antenna element comprises a quarter wave strip 1 positioned above a ground plane 2 and fed from respective switches S1 and S2 at either end.
  • the switches S1 and S2 are each connected to a changeover switch S3, and all three switches are ganged together for simultaneous operation.
  • Reference 3 is a signal source or receiver input circuitry, according to the application. Means (not shown) are provided for driving switches S1, S2 and S3 to switch from one position to the other to provide diversity switching at the two ends of the antenna element.
  • the antenna acts as a diversity antenna comprising, in effect, two antennae spaced apart by almost a quarter wavelength.
  • the two effective antennae thus formed cannot be used simultaneously but are configured instead, by a switching arrangement such as that illustrated, to operate alternately
  • Figure 2 shows the basic copper pattern of quarter wave strip 1 and ground plane 2 mounted on a dielectric substrate in the form of a printed circuit board 4.
  • the strip 1 and the ground plane 2 are on opposite sides of the board and are thus isolated from one another: the strip 1 is on the facing side of the board, and the ground plane 2 on the reverse side of the board.
  • the strip 1 acts as a quarter wavelength monopole.
  • the strip 1 is fed from either end by an identical arrangement of quarter wave transmission lines 5,6 from a common RF feed point 7.
  • An RF feed 8 is connected via an incoming line 9 to the feed point 7 via a coupling capacitor 10.
  • the transmission lines 5,6 take the form of copper foil strips printed or otherwise applied to the facing surface of the printed circuit board 4.
  • Switching of the feed from the left hand to the right hand of the strip 1 and vice versa is effected by a pair of PIN diodes 11,12.
  • Each PIN diode is connected from the junction of a respective pair of transmission lines 5,6 to a common connection point 13.
  • the connection point 13 is connected through the board 4 to the ground plane 2.
  • the diodes 11,12 are connected so that when one is forward biased, the other is reverse biased.
  • the bias supply for the diodes is taken from a DC control input 14, via a resistor 15 and a further quarter wave transmission line 16, to the common feed point 7, and thence via the left and right-hand lines 6 to the diodes.
  • An RF bypass capacitor 24 is connected from the junction between resistor 15 and line 16 to ground via a connection point 17 which is connected through the board 4 to the ground plane 2.
  • Figures 4 and 5 show the RF current distribution during right-hand and left-hand feed respectively.
  • Reference 18 represents the ground plane image current; reference 19 represents the current distribution in the monopole 1.
  • Current minima are represented by reference 20, current maxima by reference 21.
  • the current distribution determines the radiation field of the monopole 1.
  • the current maxima are mainly vertical so the generated radiation field is similar to that of a vertical half wave dipole centred at the active current maxima.
  • the left and right-hand current maxima are separated by almost a quarter wavelength and thus provide spatial diversity equivalent to moving a vertical half-wave dipole by the distance between the maxima
  • the dc voltage applied to terminal 14 may either be arranged to alternate cyclically above and below ground, thus resulting in cyclic feeding of the monopole 1 from one end then the other, or may be arranged to remain at one polarity, resulting in continuous feeding from one end only, until signal conditions deteriorate to an extent which renders a changeover necessary.
  • signal conditions can be monitored from within the remaining circuitry (not shown) to which the antenna is connected, and a control signal generated to change the polarity of the DC bias voltage applied to terminal 14 when necessary.
  • the DC feed quarter wavelength line 16 always presents an open circuit to RF, due to the action of the capacitor 24.
  • the RF input 8 is blocked to the DC applied at input 14 by the capacitor 10. It will be understood that signals applied to the input 8 (RF) and input 14 (DC) are with respect to the ground plane 2.
  • the above-described antenna achieves diversity with just a single antenna element, thus saving space in portable equipment.
  • the invention is considered to be particularly useful in time-division multiplex (TDM) communications systems in general; however, the particular application envisaged is as the antenna for the transceiver within a handset forming part of a cordless CT2 telephone apparatus.
EP92311184A 1991-12-11 1992-12-08 Diversity-Antenne Withdrawn EP0546803A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9126240 1991-12-11
GB919126240A GB9126240D0 (en) 1991-12-11 1991-12-11 Diversity antenna

Publications (1)

Publication Number Publication Date
EP0546803A1 true EP0546803A1 (de) 1993-06-16

Family

ID=10706024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92311184A Withdrawn EP0546803A1 (de) 1991-12-11 1992-12-08 Diversity-Antenne

Country Status (6)

Country Link
EP (1) EP0546803A1 (de)
JP (1) JPH05308216A (de)
CN (1) CN1077314A (de)
AU (1) AU3007692A (de)
CA (1) CA2085096A1 (de)
GB (2) GB9126240D0 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001031733A1 (en) 1999-10-29 2001-05-03 Allgon Ab Antenna device and method for transmitting and receiving radio waves
WO2002035644A1 (de) * 2000-10-26 2002-05-02 Siemens Aktiengesellschaft Antenneneinrichtung
US6392610B1 (en) 1999-10-29 2002-05-21 Allgon Ab Antenna device for transmitting and/or receiving RF waves
US6771223B1 (en) 2000-10-31 2004-08-03 Mitsubishi Denki Kabushiki Kaisha Antenna device and portable machine
US6917790B1 (en) 1999-10-29 2005-07-12 Amc Centurion Ab Antenna device and method for transmitting and receiving radio waves
US6954180B1 (en) 1999-10-29 2005-10-11 Amc Centurion Ab Antenna device for transmitting and/or receiving radio frequency waves and method related thereto
US9172138B2 (en) 2012-08-27 2015-10-27 Huawei Device Co., Ltd. Dual-feedpoint antenna system and method for feedpoint switchover of dual-feedpoint antenna system

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19603514C2 (de) * 1996-02-01 2002-08-01 Harman Becker Automotive Sys Mobiles Funkempfangssystem mit Antennendiversity
JP4642588B2 (ja) * 2005-08-05 2011-03-02 パナソニック株式会社 携帯無線装置
JP2009005142A (ja) * 2007-06-22 2009-01-08 Nec Saitama Ltd アンテナ装置及びこれを用いた携帯端末
CN104868250B (zh) * 2014-02-20 2019-03-29 联想(北京)有限公司 一种控制方法、设备及电子设备
CN110011030A (zh) * 2019-04-11 2019-07-12 惠州Tcl移动通信有限公司 天线装置及电子设备
CN110034379B (zh) * 2019-04-19 2020-12-01 Oppo广东移动通信有限公司 天线组件及电子设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818480A (en) * 1971-07-12 1974-06-18 Magnavox Co Method and apparatus for controlling the directivity pattern of an antenna
GB2088139A (en) * 1980-11-25 1982-06-03 Rca Corp Antenna arrangement for a television receiver
GB2114374A (en) * 1982-01-30 1983-08-17 Plessey Co Plc Improvements in or relating to aerials
GB2132417A (en) * 1982-12-14 1984-07-04 Taiyo Musen Co Ltd Antenna device for direction finder

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4811022A (en) * 1986-10-31 1989-03-07 Cafarelli Nicholas J Scanning antenna having phase center diversity

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818480A (en) * 1971-07-12 1974-06-18 Magnavox Co Method and apparatus for controlling the directivity pattern of an antenna
GB2088139A (en) * 1980-11-25 1982-06-03 Rca Corp Antenna arrangement for a television receiver
GB2114374A (en) * 1982-01-30 1983-08-17 Plessey Co Plc Improvements in or relating to aerials
GB2132417A (en) * 1982-12-14 1984-07-04 Taiyo Musen Co Ltd Antenna device for direction finder

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001031733A1 (en) 1999-10-29 2001-05-03 Allgon Ab Antenna device and method for transmitting and receiving radio waves
US6392610B1 (en) 1999-10-29 2002-05-21 Allgon Ab Antenna device for transmitting and/or receiving RF waves
EP1243051A1 (de) * 1999-10-29 2002-09-25 Allgon Mobile Communications AB Antennenanordnung und verfahren zum senden und empfangen von funkwellen
US6917790B1 (en) 1999-10-29 2005-07-12 Amc Centurion Ab Antenna device and method for transmitting and receiving radio waves
US6954180B1 (en) 1999-10-29 2005-10-11 Amc Centurion Ab Antenna device for transmitting and/or receiving radio frequency waves and method related thereto
US6980782B1 (en) 1999-10-29 2005-12-27 Amc Centurion Ab Antenna device and method for transmitting and receiving radio waves
WO2002035644A1 (de) * 2000-10-26 2002-05-02 Siemens Aktiengesellschaft Antenneneinrichtung
US6771223B1 (en) 2000-10-31 2004-08-03 Mitsubishi Denki Kabushiki Kaisha Antenna device and portable machine
US9172138B2 (en) 2012-08-27 2015-10-27 Huawei Device Co., Ltd. Dual-feedpoint antenna system and method for feedpoint switchover of dual-feedpoint antenna system

Also Published As

Publication number Publication date
CN1077314A (zh) 1993-10-13
GB9126240D0 (en) 1992-02-12
JPH05308216A (ja) 1993-11-19
GB9225608D0 (en) 1993-01-27
GB2262414A (en) 1993-06-16
AU3007692A (en) 1993-06-17
CA2085096A1 (en) 1993-06-12

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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