JP2006042111A - Antenna device - Google Patents

Antenna device Download PDF

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Publication number
JP2006042111A
JP2006042111A JP2004221332A JP2004221332A JP2006042111A JP 2006042111 A JP2006042111 A JP 2006042111A JP 2004221332 A JP2004221332 A JP 2004221332A JP 2004221332 A JP2004221332 A JP 2004221332A JP 2006042111 A JP2006042111 A JP 2006042111A
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JP
Japan
Prior art keywords
antenna
parasitic
ground plane
communication
antennas
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.)
Pending
Application number
JP2004221332A
Other languages
Japanese (ja)
Inventor
直志 ▲高▼木
Akihiko Iguchi
Naoshi Takagi
明彦 井口
Original Assignee
Matsushita Electric Ind Co Ltd
松下電器産業株式会社
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 Matsushita Electric Ind Co Ltd, 松下電器産業株式会社 filed Critical Matsushita Electric Ind Co Ltd
Priority to JP2004221332A priority Critical patent/JP2006042111A/en
Publication of JP2006042111A publication Critical patent/JP2006042111A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/52Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242Supports; 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
    • H01Q1/243Supports; 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
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00Antenna arrays or systems
    • H01Q21/28Combinations of substantially independent non-interacting antenna units or systems

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna device capable of miniaturizing and lightening a communication apparatus while maintaining isolation characteristics among antennas in the communication apparatus regarding the antenna device used for the communication apparatus mainly requiring a plurality of the antennas. <P>SOLUTION: A parasitic element 6 in which both ends are connected to a grounding plate 1 is further arranged to the grounding plate 1, to which antenna elements 2 and 3 constituting each antenna are connected particularly through feeding points 4 and 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an antenna device mainly used for communication equipment that requires a plurality of antennas.

  2. Description of the Related Art In recent years, various communication devices such as mobile phones have provided services that use different communication systems such as GSM, DCS, and UMTS in a single device.

  And in such a communication apparatus, the antenna corresponding to each communication system is needed, and it is important to ensure the isolation characteristic between each antenna in connection with this.

  Conventionally, in order to ensure such isolation characteristics between the antennas, additional circuits such as a changeover switch circuit and a filter circuit that ensure the isolation characteristics between the antennas have been provided.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP 2003-124730 A

  However, in such a communication device, particularly a mobile communication terminal in which miniaturization and weight reduction is a proposition, an additional circuit provided to ensure isolation characteristics between antennas is disadvantageous for miniaturization and lightening. It was an element.

  Therefore, the present invention provides an antenna device that can solve such problems and can reduce the size and weight of the communication device while maintaining the isolation characteristics between the antennas in the communication device.

  In order to achieve this object, the present invention particularly has a configuration in which a parasitic element having both ends connected to a ground plate to which each antenna element is connected via a feeding point is further arranged. is there.

  With this configuration, the current flowing through the ground plane that degrades the isolation characteristics between the antenna elements flows into the parasitic element, and the current excited by the other antenna element is reduced by the resonance phenomenon. For this reason, since the isolation characteristic between antennas is ensured without providing an additional circuit, the communication apparatus can be reduced in size and weight while maintaining the isolation characteristic between antennas in the communication apparatus.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 supposes a mobile phone which is an example of communication equipment, and schematically shows an antenna device provided in the mobile phone. Two antennas are provided for a ground plane 1 provided in the mobile phone. In addition to the conventional antenna device structure in which the elements 2 and 3 are connected via feed points 4 and 5, a parasitic element 6 having both ends connected to the ground plane 1 is provided.

  Then, by providing the parasitic element 6 having both ends connected to the ground plane 1, the isolation characteristics between the antenna elements 2 and 3 constituting each antenna can be ensured.

  That is, when two antenna elements 2 and 3 are connected to a single ground plane 1, when one antenna element 2 operates, the current excited by the antenna element 2 is indicated by an arrow 7 as indicated by an arrow 7. This flows into the other antenna element 3 along the edge region, and the other antenna element 3 is excited by this current, so that the isolation characteristics between the antenna elements 2 and 3 are deteriorated.

  Therefore, by arranging the parasitic element 6 on the ground plane 1, a loop path is formed by the parasitic element 6 and the ground plane 1 as indicated by an arrow 8 so that the current described above flows into this loop path. This current causes a resonance phenomenon in the loop path, and the current excited in the antenna element 3 is reduced along with this resonance phenomenon, so that the isolation characteristic between the antenna elements 2 and 3 can be improved. Therefore, it is not necessary to provide a complicated additional circuit such as a changeover switch circuit or a filter circuit that has been provided for securing the communication device, and the communication device can be reduced in size and weight.

  Since the parasitic element 6 is set for the purpose of improving the isolation characteristics between the antenna elements 2 and 3, the parasitic element 6 is considered in consideration of the frequency characteristics of the antenna elements 2 and 3. It is desirable to set the electrical length of the loop path formed by the above, determine the frequency appropriately in consideration of the fundamental frequency and harmonic components of the respective antenna elements 2 and 3, and the electrical length of the loop path particularly at that frequency If it is set to one wavelength, the isolation characteristics can be improved efficiently.

  Further, the connection position of the parasitic element 6 with respect to the ground plane 1 may be basically a position where current flowing between the antenna elements 2 and 3 can be drawn. In this embodiment, both ends of the parasitic element 6 are connected to each other. The configuration arranged at the edge portion of the ground plane 1 between the antenna elements 2 and 3 has been described, but the current distribution is high in the vicinity of the connection point of the antenna elements 2 and 3 as shown in FIG. Therefore, even if it is arranged outside the antenna elements 2 and 3, the same effect can be obtained, and as shown in FIG. 3, one connection point is located outside the antenna elements 2 and 3 as in the embodiment of FIG. Even when the other connection point is arranged between the antenna elements 2 and 3, the same effect can be obtained.

  However, the parasitic element 6 is arranged between the antenna elements 2 and 3 as shown in FIG. 1 and the parasitic element 6 is partially arranged in parallel with the antenna elements 2 and 3. Thus, since the parasitic element 6 functions as a reflector for the antenna elements 2 and 3, the isolation characteristics between the antenna elements 2 and 3 can be further improved.

  In the above-described embodiment, the antenna device assuming a mobile phone has been described as an example. However, the present invention is not limited to this embodiment, and may be applied to various communication devices that require a plurality of antennas. This is effective as an antenna device to be used.

  The antenna device according to the present invention can improve the isolation characteristics between a plurality of antennas, and has an effect that a communication device using the antenna device can be reduced in size and weight. This is useful in mobile communication equipment applications where a reduction in size and weight is desired.

The schematic diagram of the antenna apparatus in one Embodiment of this invention Schematic diagram of an antenna device according to another embodiment Schematic diagram of an antenna device in still another embodiment

Explanation of symbols

1 Ground plate 2, 3 Antenna element 4, 5 Feed point 6 Parasitic element

Claims (4)

  1. A ground plate; a first antenna element having one end connected to the ground plate via a first feeding point; and a second antenna element having one end connected to the ground plate via a second feeding point. An antenna device comprising a parasitic element having both ends connected to the ground plane.
  2. The region where the end of the parasitic element is located between the connection point of the first feeding point on the ground plane and the connection point of the second feeding point on the ground plane, or the connection point of the first feeding point on the ground plane Alternatively, the antenna device according to claim 1, wherein the antenna device is connected to a region near a connection point of a second feeding point on the ground plane.
  3. An end of the parasitic element is disposed in a region located between a connection point of the first feeding point on the ground plane and a connection point of the second feeding point on the ground plane, and the parasitic element is partially The antenna device according to claim 2, wherein the antenna device is juxtaposed with the first and second antenna elements.
  4. 2. The electrical length of a loop path formed by a parasitic element and a ground plane region located between both ends of the parasitic element is set to be approximately one wavelength at a predetermined frequency. Antenna device.
JP2004221332A 2004-07-29 2004-07-29 Antenna device Pending JP2006042111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004221332A JP2006042111A (en) 2004-07-29 2004-07-29 Antenna device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004221332A JP2006042111A (en) 2004-07-29 2004-07-29 Antenna device

Publications (1)

Publication Number Publication Date
JP2006042111A true JP2006042111A (en) 2006-02-09

Family

ID=35906591

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004221332A Pending JP2006042111A (en) 2004-07-29 2004-07-29 Antenna device

Country Status (1)

Country Link
JP (1) JP2006042111A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008017047A (en) * 2006-07-04 2008-01-24 Ntt Docomo Inc Multi-antenna with parasitic element
JP2008199588A (en) * 2007-01-19 2008-08-28 Matsushita Electric Ind Co Ltd Array antenna apparatus and wireless communications apparatus
WO2008120757A1 (en) * 2007-03-29 2008-10-09 Kyocera Corporation Portable wireless device
JP2009033548A (en) * 2007-07-27 2009-02-12 Toshiba Corp Antenna device and radio equipment
JP2011109547A (en) * 2009-11-20 2011-06-02 Funai Electric Co Ltd Multi-antenna apparatus, and portable equipment
JP2011124834A (en) * 2009-12-11 2011-06-23 Fujitsu Ltd Antenna apparatus and wireless terminal apparatus
WO2011102143A1 (en) * 2010-02-19 2011-08-25 パナソニック株式会社 Antenna device and portable wireless terminal equipped with same
JP2012231452A (en) * 2011-04-22 2012-11-22 Sony Mobile Communications Inc Antenna apparatus
JP2013051644A (en) * 2011-08-31 2013-03-14 Toshiba Corp Antenna device and electronic apparatus comprising the same
JP2013090208A (en) * 2011-10-19 2013-05-13 Toshiba Corp Antenna device and electronic apparatus including the same
JP2013165409A (en) * 2012-02-11 2013-08-22 Lenovo Singapore Pte Ltd Antenna system of radio terminal device
DE102013100731A1 (en) * 2012-09-26 2014-04-17 Mediatek Singapore Pte. Ltd. Communication device and antennas with high isolation properties
US8941548B2 (en) 2011-08-30 2015-01-27 Kabushiki Kaisha Toshiba Antenna device and electronic apparatus including antenna device
US8988292B2 (en) 2011-03-30 2015-03-24 Kabushiki Kaisha Toshiba Antenna device and electronic device including antenna device
EP3001505A1 (en) * 2014-09-26 2016-03-30 ACER Incorporated Antenna system
JPWO2015182677A1 (en) * 2014-05-30 2017-04-20 旭硝子株式会社 Multi-antenna and radio apparatus including the same
WO2017069181A1 (en) * 2015-10-22 2017-04-27 株式会社村田製作所 Antenna device
EP2466684B1 (en) * 2010-12-14 2019-06-19 Centre National de la Recherche Scientifique (CNRS) Diversity antenna system

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4667310B2 (en) * 2006-07-04 2011-04-13 株式会社エヌ・ティ・ティ・ドコモ Multi-antenna with parasitic elements
JP2008017047A (en) * 2006-07-04 2008-01-24 Ntt Docomo Inc Multi-antenna with parasitic element
JP2008199588A (en) * 2007-01-19 2008-08-28 Matsushita Electric Ind Co Ltd Array antenna apparatus and wireless communications apparatus
JP4571988B2 (en) * 2007-01-19 2010-10-27 パナソニック株式会社 Array antenna device and wireless communication device
JP4837776B2 (en) * 2007-03-29 2011-12-14 京セラ株式会社 Portable radio
US8611958B2 (en) 2007-03-29 2013-12-17 Kyocera Corporation Portable wireless device
WO2008120757A1 (en) * 2007-03-29 2008-10-09 Kyocera Corporation Portable wireless device
JP2009033548A (en) * 2007-07-27 2009-02-12 Toshiba Corp Antenna device and radio equipment
US7636065B2 (en) 2007-07-27 2009-12-22 Kabushiki Kaisha Toshiba Antenna apparatus and wireless device
JP2011109547A (en) * 2009-11-20 2011-06-02 Funai Electric Co Ltd Multi-antenna apparatus, and portable equipment
JP2011124834A (en) * 2009-12-11 2011-06-23 Fujitsu Ltd Antenna apparatus and wireless terminal apparatus
US9124007B2 (en) 2009-12-11 2015-09-01 Fujitsu Limited Antenna apparatus and radio terminal apparatus
WO2011102143A1 (en) * 2010-02-19 2011-08-25 パナソニック株式会社 Antenna device and portable wireless terminal equipped with same
EP2466684B1 (en) * 2010-12-14 2019-06-19 Centre National de la Recherche Scientifique (CNRS) Diversity antenna system
US8988292B2 (en) 2011-03-30 2015-03-24 Kabushiki Kaisha Toshiba Antenna device and electronic device including antenna device
US8947318B2 (en) 2011-04-22 2015-02-03 Sony Mobile Communications Inc. Antenna apparatus
JP2012231452A (en) * 2011-04-22 2012-11-22 Sony Mobile Communications Inc Antenna apparatus
EP2515379A3 (en) * 2011-04-22 2014-07-30 Sony Mobile Communications Japan, Inc. Antenna apparatus
US8941548B2 (en) 2011-08-30 2015-01-27 Kabushiki Kaisha Toshiba Antenna device and electronic apparatus including antenna device
JP2013051644A (en) * 2011-08-31 2013-03-14 Toshiba Corp Antenna device and electronic apparatus comprising the same
US8836588B2 (en) 2011-08-31 2014-09-16 Kabushiki Kaisha Toshiba Antenna device and electronic apparatus including antenna device
JP2013090208A (en) * 2011-10-19 2013-05-13 Toshiba Corp Antenna device and electronic apparatus including the same
JP2013165409A (en) * 2012-02-11 2013-08-22 Lenovo Singapore Pte Ltd Antenna system of radio terminal device
US9196948B2 (en) 2012-02-11 2015-11-24 Lenovo (Singapore) Pte Ltd Antenna system for wireless terminal devices
US8922448B2 (en) 2012-09-26 2014-12-30 Mediatek Singapore Pte. Ltd. Communication device and antennas with high isolation characteristics
DE102013100731A1 (en) * 2012-09-26 2014-04-17 Mediatek Singapore Pte. Ltd. Communication device and antennas with high isolation properties
DE102013100731B4 (en) 2012-09-26 2018-10-11 Mediatek Singapore Pte. Ltd. Communication device and antennas with high isolation properties
JPWO2015182677A1 (en) * 2014-05-30 2017-04-20 旭硝子株式会社 Multi-antenna and radio apparatus including the same
EP3001505A1 (en) * 2014-09-26 2016-03-30 ACER Incorporated Antenna system
WO2017069181A1 (en) * 2015-10-22 2017-04-27 株式会社村田製作所 Antenna device
JPWO2017069181A1 (en) * 2015-10-22 2018-06-28 株式会社村田製作所 Antenna device
US10418701B2 (en) 2015-10-22 2019-09-17 Murata Manufacturing Co., Ltd. Antenna device

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