EP2107639A1 - Antennenvorrichtung mit Empfangsdiversität und tragbare Funkkommunikationsvorrichtung damit - Google Patents

Antennenvorrichtung mit Empfangsdiversität und tragbare Funkkommunikationsvorrichtung damit Download PDF

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Publication number
EP2107639A1
EP2107639A1 EP08445015A EP08445015A EP2107639A1 EP 2107639 A1 EP2107639 A1 EP 2107639A1 EP 08445015 A EP08445015 A EP 08445015A EP 08445015 A EP08445015 A EP 08445015A EP 2107639 A1 EP2107639 A1 EP 2107639A1
Authority
EP
European Patent Office
Prior art keywords
antenna device
radiating element
frequency band
diversity
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.)
Withdrawn
Application number
EP08445015A
Other languages
English (en)
French (fr)
Inventor
Andrei Kaikkonen
Christian Braun
Peter Lindberg
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.)
Laird Technologies AB
Original Assignee
Laird Technologies AB
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 Laird Technologies AB filed Critical Laird Technologies AB
Priority to EP08445015A priority Critical patent/EP2107639A1/de
Priority to EP08156910A priority patent/EP2107636A1/de
Priority to PCT/SE2009/050324 priority patent/WO2009123550A1/en
Publication of EP2107639A1 publication Critical patent/EP2107639A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system

Definitions

  • the present invention relates generally to antennas, and particularly to an antenna device for a portable radio communication device, having receiver diversity.
  • An object of the present invention is thus to provide an antenna device for a portable radio communication device which size can be reduced without reduced performance.
  • an antenna device for a portable radio communication device, comprising a main radiating element and a diversity radiating element, wherein the main radiating element is tuned to a transmitting frequency band of the antenna device and is tuned to part of a receiving frequency band of the antenna device corresponding to the transmitting frequency band, and the diversity radiating element is tuned to part of the receiving frequency band, the size of the antenna device can be reduced without reduced performance.
  • the total antenna size is smaller, or could alternatively be made more efficient, than an original antenna.
  • the part of a receiving frequency band of the main radiating element is preferably closer to the transmitting frequency band compared to the part of the receiving frequency band of the diversity radiating element, whereby performance can be improved. Further, even when the part of a receiving frequency band of the main radiating element and the part of the receiving frequency band of the diversity radiating element are distinct apart and they together constitute not fully the receiving frequency band of the antenna device the size of the antenna device can be reduced compared to an original antenna.
  • the matching specification in band can be typically -6 dB, both for the Tx band and for the Rx band.
  • a matching of -6 dB means that about 1.2 dB power is lost due to mismatch losses.
  • the matching requirement for the Rx band can be significantly relaxed.
  • the preferred one to be used in an antenna device according to the present invention is Maximum Ratio Combining (MRC), where each antenna branch is scaled with an amplitude and phase in order to maximize the resulting Signal-to-noise ratio (SNR).
  • SNR Signal-to-noise ratio
  • MRC Maximum Ratio Combining
  • the resulting SNR is the sum of the incoming SNR:s.
  • the difference in performance is defined by the mismatch loss as described above.
  • antennas receiving fully correlated signals e.g. in an anechoic chamber which is useful for type approval testing in the lab.
  • the preferred way to utilize antenna diversity is to design the antennas to receive uncorrelated signals in a multi-path environment. In this case, the diversity gain would be even larger than described above.
  • the size of the antenna device can be further reduced without reduced performance, which matching preferably is arranged to be adaptively performed.
  • An antenna device for a portable radio communication device such as mobile phones, PDA, portable computers and similar devices, comprises a main radiating element 1 and a diversity radiating element 2.
  • the main radiating element 1 is arranged to be tuned 8 to the transmitting frequency band TX of an operating band of the antenna device, such as GSM900, and to partly match the corresponding receiving frequency band RX of the operating band of the antenna device.
  • the diversity radiating element 2 is arranged to be tuned 9 to partly match the corresponding receiving frequency band RX.
  • the main radiating element 1 would receive strongest signals in the lower part of the receiving frequency band RX of the antenna device and the diversity radiating element 2 would receive strongest signals in the upper part of the receiving frequency band TX of the antenna device.
  • the part 8 of the receiving frequency band RX covered by the main radiating element 1 and the part 9 of the receiving frequency band RX covered by the diversity radiating element 2 are preferably distinct apart, i.e. utilizing a relaxed S 11 requirement to reduce the size of the antenna device.
  • the total coverage of the receiving frequency band RX from the main radiating element 1 and the diversity radiating element 2 is thus not fulfilled, which however is compensated by the receiver diversity.
  • Signals transmitted from the antenna device go through the main radiating element 1 via a transmitter circuit 4 and a duplexer 3.
  • Signals received at the antenna device go through the main radiating element 1, the duplexer 3, and a receiver circuit 5 and is combined in a diversity combiner 7 with signals that go through the diversity radiating element 2 and its separate receiver circuit 6.
  • the diversity radiating element 2 is preferably positioned relatively near the main radiating element 1 in the portable radio communication device, such as at the same half of the portable radio communication device instead of opposing parts thereof.
  • This positioning gets the following advantages. By being positioned closer to RF circuits, that are typically placed in one shielded area of the portable radio communication device, there is no need for long RF transmission lines on the printed circuit board of the portable radio communication device. Also, metal covers can be used at all places where there is no antenna, and with both main antenna and diversity antenna in a tight area a larger portion of the portable radio communication device can be provided with a metal cover.
  • the main radiating element 1 is an active antenna element with adaptive matching 10, which adaptively tunes 11 the center 13 of the matching into the TX channel currently used, but which matching still partly covers the RX band.
  • Adaptive matching system for antennas uses a narrowband antenna element that is tuned to the specific channel used at the moment.
  • the tuning is optimized to the Tx channel, since it is straightforward to measure the matching for the Tx channel (reflected power meter). With only one antenna, it will be challenging to get the Rx performance in place. With a diversity receiving antenna the tuning of the Tx channel is more easy achieved by taking no or only little regard to the Rx channel for the main antenna, since this can be handled by the diversity receiving antenna.
  • the same principle with part of the receiving frequency band covered by a narrow band radiating element separate from the main radiating element covering part of the receiving frequency band and the transmitting band can be applied to multiple operating bands.
  • the main radiating element would thus be tuned to TX for e.g. GSM900 and GSM1800 and partly tuned to RX for GSM900 and GSM1800, whereas the diversity radiating element would be partly tuned to RX for GSM900 and GS1800.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP08445015A 2008-03-31 2008-03-31 Antennenvorrichtung mit Empfangsdiversität und tragbare Funkkommunikationsvorrichtung damit Withdrawn EP2107639A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP08445015A EP2107639A1 (de) 2008-03-31 2008-03-31 Antennenvorrichtung mit Empfangsdiversität und tragbare Funkkommunikationsvorrichtung damit
EP08156910A EP2107636A1 (de) 2008-03-31 2008-05-26 Antennenanordnung mit Empfangsdiversität und tragbare Vorrichtung damit
PCT/SE2009/050324 WO2009123550A1 (en) 2008-03-31 2009-03-27 An antenna device having receiver diversity and a portable radio communication device comprising such an antenna device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08445015A EP2107639A1 (de) 2008-03-31 2008-03-31 Antennenvorrichtung mit Empfangsdiversität und tragbare Funkkommunikationsvorrichtung damit

Publications (1)

Publication Number Publication Date
EP2107639A1 true EP2107639A1 (de) 2009-10-07

Family

ID=39511101

Family Applications (2)

Application Number Title Priority Date Filing Date
EP08445015A Withdrawn EP2107639A1 (de) 2008-03-31 2008-03-31 Antennenvorrichtung mit Empfangsdiversität und tragbare Funkkommunikationsvorrichtung damit
EP08156910A Withdrawn EP2107636A1 (de) 2008-03-31 2008-05-26 Antennenanordnung mit Empfangsdiversität und tragbare Vorrichtung damit

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP08156910A Withdrawn EP2107636A1 (de) 2008-03-31 2008-05-26 Antennenanordnung mit Empfangsdiversität und tragbare Vorrichtung damit

Country Status (2)

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EP (2) EP2107639A1 (de)
WO (1) WO2009123550A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017182069A1 (en) * 2016-04-20 2017-10-26 Huawei Technologies Co., Ltd. Antenna arrangement and method for antenna arrangement
CN107835045B (zh) * 2017-11-16 2021-05-28 青岛海信移动通信技术股份有限公司 一种移动终端的对讲信号处理方法、电路及移动终端
CN111953389B (zh) * 2020-08-06 2023-10-03 惠州Tcl移动通信有限公司 天线调谐方法、装置、存储介质及电子终端

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0332139A2 (de) * 1988-03-10 1989-09-13 Kabushiki Kaisha Toyota Chuo Kenkyusho Breitbandige Antenne für bewegliche Funkverbindungen
US20030058174A1 (en) * 2001-09-25 2003-03-27 Samsung Electro-Mechanics Co., Ltd. Dual feeding chip antenna with diversity function
EP1475858A1 (de) * 2002-02-15 2004-11-10 Matsushita Electric Industrial Co., Ltd. Antenneneinheit und tragbares funksystem mit antenneneinheit
US7298339B1 (en) * 2006-06-27 2007-11-20 Nokia Corporation Multiband multimode compact antenna system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE516842C2 (sv) * 2000-07-10 2002-03-12 Allgon Ab Antennanordning för en bärbar radiokommunikationsanordning
WO2004077610A1 (en) * 2003-02-28 2004-09-10 Research In Motion Limited Multiple-element antenna with wide-band antenna element
JP2006325133A (ja) * 2005-05-20 2006-11-30 Matsushita Electric Ind Co Ltd 放送用受信機付き携帯電話
JP4257349B2 (ja) * 2005-09-08 2009-04-22 株式会社カシオ日立モバイルコミュニケーションズ アンテナ装置及び無線通信端末
EP1770874A1 (de) * 2005-09-28 2007-04-04 Nortel Networks Limited Antennensystem für eine Funkstation, und Funkstation mit einem solchen Antennensystem
FI118837B (fi) * 2006-05-26 2008-03-31 Pulse Finland Oy Kaksoisantenni
US7885619B2 (en) * 2007-06-12 2011-02-08 Telefonaktiebolaget Lm Ericsson (Publ) Diversity transmission using a single power amplifier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0332139A2 (de) * 1988-03-10 1989-09-13 Kabushiki Kaisha Toyota Chuo Kenkyusho Breitbandige Antenne für bewegliche Funkverbindungen
US20030058174A1 (en) * 2001-09-25 2003-03-27 Samsung Electro-Mechanics Co., Ltd. Dual feeding chip antenna with diversity function
EP1475858A1 (de) * 2002-02-15 2004-11-10 Matsushita Electric Industrial Co., Ltd. Antenneneinheit und tragbares funksystem mit antenneneinheit
US7298339B1 (en) * 2006-06-27 2007-11-20 Nokia Corporation Multiband multimode compact antenna system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JAKES, W. C.: "Microwave Mobile Communications", AT&T IMP CORP, 1974

Also Published As

Publication number Publication date
WO2009123550A1 (en) 2009-10-08
EP2107636A1 (de) 2009-10-07

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