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
ground plane
antenna device
parasitic element
feeding point
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Pending
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JP2004221332A
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Japanese (ja)
Inventor
直志 ▲高▼木
Naoshi Takagi
Akihiko Iguchi
明彦 井口
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial 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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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • 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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations 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

本発明は、主として複数のアンテナを要する通信機器に用いられるアンテナ装置に関するものである。   The present invention relates to an antenna device mainly used for communication equipment that requires a plurality of antennas.

近年、携帯電話に代表されるように各種通信機器においては、ＧＳＭやＤＣＳやＵＭＴＳといった異なる通信システムを単一の機器において利用するサービスが提供されている。   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.

そして、このような通信機器においては、それぞれの通信システムに対応したアンテナが必要となり、これに伴いそれぞれのアンテナ間のアイソレーション特性を確保することが重要となっている。   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.

従来、このようなアンテナ間のアイソレーション特性を確保するために、アンテナ間にそれぞれのアイソレーション特性を確保する切換スイッチ回路やフィルタ回路などの付加回路が設けられていた。   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.

なお、この出願の発明に関する先行技術文献情報としては、例えば、特許文献１が知られている。
特開２００３−１２４７３０号公報 As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP 2003-124730 A

しかしながら、このような通信機器、特に小型軽量化が命題となっている移動体通信端末等においては、アンテナ間のアイソレーション特性を確保するために設けられる付加回路は小型軽量化に対して不利な要素となっていた。   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.

そこで、本発明はこのような課題を解消し、通信機器におけるアンテナ間のアイソレーション特性を維持しつつ通信機器の小型軽量化が可能となるアンテナ装置を提供するものである。   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.

この目的を達成するために本発明は、特に、それぞれのアンテナを構成するアンテナ素子が給電点を介して接続される地板に対して両端が接続された無給電素子をさらに配置した構成としたのである。   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.

この構成とすれば、アンテナ素子間のアイソレーション特性を劣化させる地板を通じて流れる電流が無給電素子に流れ込み、その共振現象により他方のアンテナ素子に励振される電流が低減される。このため、付加回路を設けなくともアンテナ間のアイソレーション特性が確保されるので、通信機器におけるアンテナ間のアイソレーション特性を維持しつつ通信機器の小型軽量化が可能とできるのである。   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.

以下、本発明の一実施形態について図を用いて説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図１は通信機器の一例である携帯電話を想定し、この携帯電話に設けられたアンテナ装置を模式的に示したものであり、携帯電話内に設けられた地板１に対して２本のアンテナ素子２，３が給電点４，５を介して接続した従来のアンテナ装置構造に加え、さらに両端が地板１に接続された無給電素子６を設けた構成となっている。   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.

そして、地板１に両端が接続された無給電素子６を設けることにより、各アンテナを構成するアンテナ素子２，３の間のアイソレーション特性が確保できるのである。   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.

すなわち、単一の地板１に対して２つのアンテナ素子２，３を接続した場合、一方のアンテナ素子２が動作するとき、アンテナ素子２により励振された電流が矢印７で示されるように地板１の端縁領域に沿って他方のアンテナ素子３に流れ込み、この電流により他方のアンテナ素子３が励振することで、アンテナ素子２，３の間のアイソレーション特性が劣化するものである。   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.

そこで、地板１に無給電素子６を配置することで、矢印８で示されるように無給電素子６と地板１とでループ経路が形成され、このループ経路に先に述べた電流が流れ込むようになり、この電流によりループ経路で共振現象が生じ、この共振現象に伴いアンテナ素子３に励振される電流が低減されアンテナ素子２，３の間のアイソレーション特性を向上できるので、従来このアイソレーション特性を確保するために設けられていた切換スイッチ回路やフィルタ回路などの複雑な付加回路を設ける必要が無くなり、通信機器の小型軽量化が可能となるのである。   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.

また、無給電素子６はアンテナ素子２，３の間におけるアイソレーション特性の向上を目的として設定されるものであることから、それぞれのアンテナ素子２，３における周波数特性を考慮しその無給電素子６により形成されるループ経路の電気長を設定することが望ましく、それぞれのアンテナ素子２，３の基本周波数や高調波成分を考慮し適宜その周波数を決定し、ループ経路の電気長を特にその周波数における一波長に設定すれば効率よくアイソレーション特性を改善できるのである。   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.

また、地板１に対する無給電素子６の接続位置については、基本的にアンテナ素子２，３の間に流れる電流を引き込める位置であれば良く、この一実施形態においては無給電素子６の両端をアンテナ素子２，３の間における地板１の端縁部分に配置した構成を挙げて説明したが、図２に示されるようにアンテナ素子２，３の接続点の近傍領域であれば電流分布が高いのでアンテナ素子２，３の外側に配置しても同様の効果が得られ、また、図３に示されるように一方の接続点を図２の実施形態と同様にアンテナ素子２，３の外側に配置し他方の接続点をアンテナ素子２，３の間に配置した場合でも同様の効果が得られるものである。   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.

ただし、無給電素子６を図１に示されるようにアンテナ素子２，３の間に配置するとともに、部分的に無給電素子６をそれぞれのアンテナ素子２，３と並設するように配置することにより、無給電素子６がアンテナ素子２，３の反射器として機能するため、さらにアンテナ素子２，３の間のアイソレーション特性を向上させることができるのである。   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.

なお、上述した実施形態においては、携帯電話を想定したアンテナ装置を例に挙げて説明したが、本発明はこの実施形態に限定されるものではなく、複数のアンテナを必要とする各種通信機器に用いられるアンテナ装置として効果を奏するものである。   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.

本発明にかかるアンテナ装置は、複数のアンテナ間のアイソレーション特性を向上させることができ、このアンテナ装置を用いた通信機器の小型軽量化ができるという効果を有し、特に携帯電話などのような小型軽量化が望まれる移動体通信機器用途において有用である。   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.

本発明の一実施形態におけるアンテナ装置の模式図The schematic diagram of the antenna apparatus in one Embodiment of this invention 他の実施形態におけるアンテナ装置の模式図Schematic diagram of an antenna device according to another embodiment さらに他の実施形態におけるアンテナ装置の模式図Schematic diagram of an antenna device in still another embodiment

符号の説明Explanation of symbols

１ 地板
２，３ アンテナ素子
４，５ 給電点
６ 無給電素子 1 Ground plate 2, 3 Antenna element 4, 5 Feed point 6 Parasitic element

Claims (4)

地板と、この地板に一端が第１の給電点を介して接続された第１のアンテナ素子と、前記地板に一端が第２の給電点を介して接続された第２のアンテナ素子とを備え、前記地板に両端が接続された無給電素子を配置したことを特徴とするアンテナ装置。 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. 無給電素子の端部を、地板における第１の給電点の接続点と前記地板における第２の給電点の接続点との間に位置する領域、もしくは前記地板における第１の給電点の接続点或いは前記地板における第２の給電点の接続点の近傍領域に接続したことを特徴とする請求項１に記載のアンテナ装置。 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. 無給電素子の端部を、地板における第１の給電点の接続点と前記地板における第２の給電点の接続点との間に位置する領域に配置するとともに、前記無給電素子を部分的に前記第１、第２のアンテナ素子と並設させたことを特徴とする請求項２に記載のアンテナ装置。 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. 無給電素子とこの無給電素子の両端部間に位置する地板領域で形成されるループ経路の電気長を所定の周波数における略一波長となるように設定したことを特徴とする請求項１に記載のアンテナ装置。 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)

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US8988292B2 (en) 2011-03-30 2015-03-24 Kabushiki Kaisha Toshiba Antenna device and electronic device including antenna device
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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
US8922448B2 (en) 2012-09-26 2014-12-30 Mediatek Singapore Pte. Ltd. Communication device and antennas with high isolation characteristics
JPWO2015182677A1 (en) * 2014-05-30 2017-04-20 旭硝子株式会社 Multi-antenna and radio apparatus including the same
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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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