JP2007288561A - Antenna for portable radio - Google Patents

Antenna for portable radio Download PDF

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Publication number
JP2007288561A
JP2007288561A JP2006114190A JP2006114190A JP2007288561A JP 2007288561 A JP2007288561 A JP 2007288561A JP 2006114190 A JP2006114190 A JP 2006114190A JP 2006114190 A JP2006114190 A JP 2006114190A JP 2007288561 A JP2007288561 A JP 2007288561A
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Japan
Prior art keywords
antenna
antenna element
wireless device
portable wireless
housing
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JP2006114190A
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Japanese (ja)
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Kenichi Sato
健一 佐藤
Yukinari Takahashi
志勢 高橋
Kota Aoki
恒太 青木
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to JP2006114190A priority Critical patent/JP2007288561A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To make an antenna into wideband, to raise antenna gain and to avoid increase in size and costs of a device. <P>SOLUTION: A parasitic element 216 integrated with a conductive heat dissipating sheet is arranged at a position separated from and opposite to the width direction of a third power supply part 214, grounded to GND of a lower case bottom board 204a, wider bandwidth is attained and the antenna gain is raised by coupling between a third antenna element 215 and the parasitic element at an open end. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、開閉自在な機構を有する折畳み式携帯無線機用アンテナの広帯域化、アンテナ利得の向上を実現するためのアンテナ構造に関する。 The present invention relates to an antenna structure for realizing a wide band antenna and an improved antenna gain for a folding portable radio having an openable and closable mechanism.

従来、この種のアンテナとしては、例えば、特許文献１に記載されているようなものがあった。図６は前記特許文献１に記載された従来のアンテナ構成を示している。図６において、端末筐体１０１の内部の回路基板１０２上に、回路基板１０２上の信号線と電気的に接続された第１の内部アンテナ１０３を実装するとともに、端末筐体１０１面上に第２の内部アンテナ１０４を配置する。このような構成により、第２のアンテナ１０４が、第１の内部アンテナ１０３と空間的に結合するので、実装体積を増加させることなく、内部アンテナの高利得化、広帯域化を図ることができる。
特開２００１−８５９２０号公報（第１項、第１図） Conventionally, this type of antenna has been described in, for example, Patent Document 1. FIG. 6 shows a conventional antenna configuration described in Patent Document 1. In FIG. 6, the first internal antenna 103 electrically connected to the signal line on the circuit board 102 is mounted on the circuit board 102 inside the terminal housing 101, and the first internal antenna 103 is mounted on the surface of the terminal housing 101. Two internal antennas 104 are arranged. With such a configuration, since the second antenna 104 is spatially coupled to the first internal antenna 103, the internal antenna can be increased in gain and bandwidth without increasing the mounting volume.
Japanese Patent Laid-Open No. 2001-85920 (first term, FIG. 1)

しかしながら、前記従来のアンテナ構成では、アンテナ面積及び体積が必要であり、折畳み式携帯無線機の小型、薄型化を図る上では、大きな課題であった。
本発明は、上記課題を解決するために、第３給電部の幅方向において離間して対向する位置に、無給電素子をGNDに接地し、第３アンテナと前記無給電素子の開放端で結合させることにより、小型・薄型で、かつ、高性能な折畳み式携帯無線機を提供することができる。 However, the conventional antenna configuration requires an antenna area and a volume, which is a major problem in reducing the size and thickness of a folding portable radio.
In order to solve the above problems, the present invention grounds a parasitic element to GND at a position facing and spaced apart in the width direction of the third feeding part, and couples the third antenna to the open end of the parasitic element. By doing so, it is possible to provide a foldable portable wireless device that is small, thin, and has high performance.

前記従来の課題を解決するため、本発明のアンテナ構成では、第３給電部の幅方向において離間して対向する位置に、導電性の放熱シートと一体化させた無給電素子をGNDに接地し、第３アンテナと前記無給電素子の開放端で結合させることにより、アンテナの広帯域が図れ、かつ、金属板上でのアンテナ利得が向上する。   In order to solve the above-described conventional problems, in the antenna configuration of the present invention, a parasitic element integrated with a conductive heat radiation sheet is grounded to GND at a position facing and spaced apart in the width direction of the third feeding portion. By combining the third antenna and the parasitic element at the open end, a wide band of the antenna can be achieved and the antenna gain on the metal plate can be improved.

以上のように、本発明のアンテナ構成によれば、下筐体の下部に配置されたアンテナの広帯域化が図れ、かつ、下筐体の下部および上部に配置されたアンテナの待受け時の性能（特に、金属板上でのアンテナ利得）の向上が図れる。更に、本アンテナは省スペースで具現化できるとともに、他部品と共用するため、折畳み式携帯無線機を小型、かつ、薄型化することができるとともに、コストダウンも図れる。   As described above, according to the antenna configuration of the present invention, it is possible to broaden the bandwidth of the antenna disposed in the lower portion of the lower housing, and to perform the standby performance of the antennas disposed in the lower and upper portions of the lower housing ( In particular, the antenna gain on the metal plate can be improved. Furthermore, the antenna can be realized in a space-saving manner, and can be shared with other components, so that the folding portable wireless device can be reduced in size and thickness, and the cost can be reduced.

以下に、本発明の実施の形態について、図面を参照しながら説明する。
（実施の形態１）
図１は、本発明の実施の形態１におけるアンテナ構成の原理的な斜視図であり、図２は、本発明の実施の形態１における折畳み式携帯無線機及びアンテナ構成の斜視図である。また、図３（a）は、本発明の実施の形態１における放熱シートの正面図であり、図３（b）は、下ユニットの構成を示した斜視図である。図４は、本発明の実施の形態１における無線回路のブロック図であり、図５（a）は、本発明の実施の形態１における自由空間でのVSWR特性、図５(b)は、本発明の実施の形態１における金属板上でのVSWR特性である。 Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment 1)
FIG. 1 is a perspective view of the principle of an antenna configuration according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view of a foldable portable radio device and antenna configuration according to Embodiment 1 of the present invention. Moreover, Fig.3 (a) is a front view of the thermal radiation sheet | seat in Embodiment 1 of this invention, FIG.3 (b) is the perspective view which showed the structure of the lower unit. FIG. 4 is a block diagram of the radio circuit according to the first embodiment of the present invention. FIG. 5A is a VSWR characteristic in free space according to the first embodiment of the present invention, and FIG. It is a VSWR characteristic on the metal plate in Embodiment 1 of invention.

図１において、上筐体地板２０３aと下筐体地板２０４aとを備え、上筐体地板２０３aと下筐体地板２０４aは、第２給電部２１３からヒンジ部品２０５aに給電され、折畳み式携帯無線機が開いた状態では、ダイポールアンテナとして動作し、折畳み式携帯無線機が閉じた状態では、ヒンジ部品２０５aがモノポールアンテナとして動作する。また、第１アンテナ素子２１２と第１給電部２１１及び、第３アンテナ素子２１５と第３給電部２１４とを備え、折畳み式携帯無線機の状態及び、受信電界レベルを検出することにより、各状態及び受信電界レベルで最適なアンテナが選択される。また、前記第３アンテナ素子２１５の広帯域化及び、利得向上のため無給電素子２１６を備えている。無給電素子２１６は、第３給電部２１４の幅方向において離間して対向する位置に、導電性の放熱シート２２０aと一体化された無給電素子２２１aを配置し、下筐体地板２０４aのGNDに接地され、第３アンテナ素子２１５と無給電素子２２１aとの開放端での結合により、広帯域化が図れ、かつ、アンテナ利得が向上する。   In FIG. 1, an upper housing ground plate 203a and a lower housing ground plate 204a are provided. The upper housing ground plate 203a and the lower housing ground plate 204a are fed with power to the hinge component 205a from the second power feeding unit 213, and are foldable portable wireless devices. When is opened, it operates as a dipole antenna, and when the folding portable radio is closed, the hinge part 205a operates as a monopole antenna. Each state includes a first antenna element 212, a first feeding unit 211, a third antenna element 215, and a third feeding unit 214, and detects the state of the folding portable wireless device and the received electric field level. And the optimum antenna is selected at the received electric field level. Further, a parasitic element 216 is provided for widening the third antenna element 215 and improving the gain. The parasitic element 216 is arranged with a parasitic element 221a integrated with the conductive heat radiation sheet 220a at a position facing and spaced apart in the width direction of the third feeding portion 214, and is connected to the GND of the lower casing ground plane 204a. By connecting the third antenna element 215 and the parasitic element 221a at the open end, the bandwidth can be increased, and the antenna gain can be improved.

図２において、上筐体２０３はサブLCD２０１及びカメラ２０２を備え、下筐体２０４は第１アンテナ素子２１２及び第３アンテナ素子２１５を備えている。また、ヒンジ２０５を介して、上筐体と下筐体がダイポールアンテナとして動作する。   In FIG. 2, the upper casing 203 includes a sub LCD 201 and a camera 202, and the lower casing 204 includes a first antenna element 212 and a third antenna element 215. Further, the upper casing and the lower casing operate as a dipole antenna via the hinge 205.

図３（a）は、本発明の実施の形態１における放熱シートの正面図であり、放熱シート（導体）２２０aと無給電素子（導体）２２１aに、電気的に分割されている。   FIG. 3A is a front view of the heat radiating sheet according to Embodiment 1 of the present invention, which is electrically divided into a heat radiating sheet (conductor) 220a and a parasitic element (conductor) 221a.

図３（b）は、下ユニットの構成を示した斜視図である。下筐体２２３にキーシート２２２、放熱シート２２０及び無給電素子２２１の順でケーシングされ、無給電素子２２１は下筐体地板２０４aのGND接点２３０に接触する。これにより、第３アンテナ２１５の広帯域化が図れ、かつ、第１アンテナ及び第３アンテナの金属板上でのアンテナ利得が改善される。   FIG. 3B is a perspective view showing the configuration of the lower unit. The lower casing 223 is casing the key sheet 222, the heat dissipation sheet 220, and the parasitic element 221 in this order, and the parasitic element 221 contacts the GND contact 230 of the lower casing base plate 204a. Thereby, the broadband of the third antenna 215 can be achieved, and the antenna gain on the metal plate of the first antenna and the third antenna is improved.

図４は、本実施の形態１を実現するための無線部のブロック図である。本発明と関連しない機能ブロックについてはその説明を省略する。状態検出部１２は折畳み式携帯無線機の開き状態あるいは閉じ状態の動作状態を検出し、アンテナ切替えスイッチ１３を切替える。また、受信信号レベル検出回路２０ではそれぞれの受信電界レベルを検出し、アンテナ切換え制御部２１はアンテナ切替えスイッチ１３に対して受信電界レベルの高いアンテナを選択するよう制御する。したがって、折畳み式携帯無線機の開き状態では、第１のアンテナ１１および第３のアンテナ素子２１５が動作状態となるよう切替え、折畳み式携帯無線機の閉じ状態では、第１のアンテナ１１および第２のアンテナ素子２１２が動作状態となるよう切替え、受信信号レベル検出回路２０にてそれぞれ受信電界レベルの高いアンテナを選択し、２１のアンテナ切替え制御部でどちらか一方のアンテナを選択する。この構成により、折畳み式携帯無線機の使用形態によらず安定した通信品質を確保し、高性能なアンテナシステムを提供することができる。
（実施の形態２）
図５（a）は、本発明の実施の形態２における自由空間でのVSWR特性である。波線は、無給電素子が無い場合の第３アンテナのVSWR特性であり、実線は、本発明の実施の形態２における無給電素子を追加した場合のVSWR特性である。実線で示す通り、無給電素子の効果により、共振周波数f3が発生する。この共振周波数f3により、アンテナが広帯域となる。 FIG. 4 is a block diagram of a radio unit for realizing the first embodiment. Description of functional blocks not related to the present invention is omitted. The state detection unit 12 detects the operating state of the folding portable wireless device in an open state or a closed state, and switches the antenna changeover switch 13. The reception signal level detection circuit 20 detects each reception electric field level, and the antenna switching control unit 21 controls the antenna switching switch 13 to select an antenna having a high reception electric field level. Accordingly, the first antenna 11 and the third antenna element 215 are switched to the operating state when the folding portable wireless device is opened, and the first antenna 11 and the second antenna 11 are switched when the folding portable wireless device is closed. The antenna element 212 is switched to the operating state, the reception signal level detection circuit 20 selects an antenna having a high reception electric field level, and the antenna switching control unit 21 selects one of the antennas. With this configuration, it is possible to ensure stable communication quality regardless of the usage mode of the folding portable wireless device and to provide a high-performance antenna system.
(Embodiment 2)
FIG. 5A shows VSWR characteristics in free space according to Embodiment 2 of the present invention. The wavy line is the VSWR characteristic of the third antenna when there is no parasitic element, and the solid line is the VSWR characteristic when the parasitic element in the second embodiment of the present invention is added. As indicated by the solid line, the resonance frequency f3 is generated by the effect of the parasitic element. The antenna has a wide band due to the resonance frequency f3.

図５（b）は、本発明の実施の形態２における金属板上でのVSWR特性である。折畳み式携帯無線機を金属板上に乗せた場合、共振周波数f1は劣化するが、無給電素子の効果により、共振周波数f4が発生する。この共振周波数f4により、折畳み式携帯無線機を金属板上に乗せた場合においても、従来の折畳み式携帯無線機に比べて利得向上が図れる。   FIG. 5B shows the VSWR characteristics on the metal plate in the second embodiment of the present invention. When the folding portable wireless device is placed on the metal plate, the resonance frequency f1 is deteriorated, but the resonance frequency f4 is generated due to the effect of the parasitic element. With this resonance frequency f4, even when the folding portable wireless device is placed on a metal plate, the gain can be improved as compared with the conventional folding portable wireless device.

第１アンテナ素子２１２および第３アンテナ素子２１５は、ヒンジ部品２０５aの近傍および下筐体２０４の下部に内蔵される。第１アンテナ素子２１２および第３アンテナ素子２１５は、リアクタンス素子２４０aおよび２４０bを介在させことにより、第１の共振周波数f1と第２の共振周波数f2、および第３の共振周波数f3を有した多周波アンテナを実現している。多周波アンテナとして、本発明人によって開示された特開２００４−１３４９７５号公報に記載の多周波アンテナを用い、内蔵型のモノポールアンテナを実現している。   The first antenna element 212 and the third antenna element 215 are built in the vicinity of the hinge part 205a and in the lower part of the lower housing 204. The first antenna element 212 and the third antenna element 215 have a multi-frequency having a first resonance frequency f1, a second resonance frequency f2, and a third resonance frequency f3 by interposing reactance elements 240a and 240b. An antenna is realized. As the multi-frequency antenna, a built-in monopole antenna is realized by using the multi-frequency antenna described in Japanese Patent Application Laid-Open No. 2004-134975 disclosed by the present inventors.

ここで、f1は830MHzから960MHzである。f2からf3は、1710MHzから2484MHzである。これら、f1、f2、f3の帯域で共振周波数を有するようにしたので、欧州や日本におけるGSM、DCS、PCS、W−CDMAに好適となっている。また、Bluetoothおよび無線LANなどの近距離無線通信の帯域もカバーしている。   Here, f1 is 830 MHz to 960 MHz. f2 to f3 are 1710 MHz to 2484 MHz. Since these resonance frequencies are in the f1, f2, and f3 bands, they are suitable for GSM, DCS, PCS, and W-CDMA in Europe and Japan. It also covers short-range wireless communication bands such as Bluetooth and wireless LAN.

図６は、従来の発明の斜視図であり、端末筐体１０１の内部に、回路基板１０２とともに、第１の内部アンテナ１０４と第２の内部アンテナ１０５が内蔵されている   FIG. 6 is a perspective view of a conventional invention, in which a first internal antenna 104 and a second internal antenna 105 are built in a terminal casing 101 together with a circuit board 102.

本発明にかかる折畳み式携帯無線機は、無給電素子を配置することにより、アンテナを広帯域化することができ、かつ、アンテナ利得の向上を図ることができると共に、装置の大型化、コストアップが回避されるという効果を有し、携帯電話機、ＰＤＡ、モバイル型のＰＣなど、開閉可能な小型電子機器に適用するのに好適である。   The foldable portable radio device according to the present invention can increase the antenna gain by arranging the parasitic element, and can improve the antenna gain, and increase the size and cost of the device. It has the effect of being avoided, and is suitable for application to small electronic devices that can be opened and closed, such as cellular phones, PDAs, and mobile PCs.

本発明の実施の形態１におけるアンテナ構成の原理的な斜視図The perspective view of the principle of the antenna configuration in Embodiment 1 of the present invention 本発明の実施の形態１における折畳み式携帯無線機及びアンテナ構成の斜視図1 is a perspective view of a folding portable wireless device and an antenna configuration according to Embodiment 1 of the present invention. (a) 本発明の実施の形態１における放熱シートの正面図(b) 本発明の実施の形態１における下ユニット構成の斜視図(a) Front view of heat dissipation sheet in embodiment 1 of the present invention (b) Perspective view of lower unit configuration in embodiment 1 of the present invention 本発明の実施の形態１における無線回路部のブロック図The block diagram of the radio | wireless circuit part in Embodiment 1 of this invention (a) 本発明の実施の形態２における自由空間でのVSWR特性図(b) 本発明の実施の形態２における金属板上でのVSWR特性図(a) VSWR characteristic diagram in free space in Embodiment 2 of the present invention (b) VSWR characteristic diagram on metal plate in Embodiment 2 of the present invention 従来の発明の斜視図Perspective view of conventional invention

符号の説明Explanation of symbols

１１ 第３アンテナ素子
１２ 状態検出部
１３ アンテナ切り替えスイッチ
１４ アイソレータ
１５ パワーアンプ
１６ 送信BPF
１７ 受信LNA
１８ 受信BPF
１９ 無線部送受信IC
２０ 受信信号レベル検出回路
２１ アンテナ切替え制御部
１０１ 端末筐体
１０２ 回路基板
１０３ 第１の内部アンテナ
１０４ 第２の内部アンテナ
１０５ 外部アンテナ
２０１ サブLCD
２０２ カメラ
２０３ 上筐体
２０３a 上筐体地板
２０４ 下筐体
２０４a 下筐体地板
２０５ ヒンジ
２０５a ヒンジ部品
２０６ 上下フレキ
２１１ 第１給電部
２１２ 第１アンテナ素子
２１３ 第２給電部
２１４ 第３給電部
２１５ 第３アンテナ素子
２２０ 放熱シート
２２０a 導体（放熱シート）
２２１ 無給電素子
２２１a 導体（無給電素子）
２２２ キーシート
２２３ 下筐体
２３０ 無給電素子のGND接点
２４０a リアクタンス素子
２４０b リアクタンス素子 11 Third antenna element 12 State detector 13 Antenna changeover switch 14 Isolator 15 Power amplifier 16 Transmission BPF
17 Receive LNA
18 Received BPF
19 Radio transceiver IC
20 reception signal level detection circuit 21 antenna switching control unit 101 terminal housing 102 circuit board 103 first internal antenna 104 second internal antenna 105 external antenna 201 sub LCD
202 Camera 203 Upper housing 203a Upper housing ground plate 204 Lower housing 204a Lower housing ground plate 205 Hinge 205a Hinge component 206 Vertical flex 211 First feed unit 212 First antenna element 213 Second feed unit 214 Third feed unit 215 First 3 antenna elements 220 heat dissipation sheet 220a conductor (heat dissipation sheet)
221 Parasitic element 221a Conductor (parasitic element)
222 Key sheet 223 Lower housing 230 GND contact of parasitic element 240a Reactance element 240b Reactance element

Claims (3)

第１の筐体と第２の筐体とをヒンジ部で連結して、開閉自在な機構を有する折畳み式の携帯無線機であって、前記第２の筺体下部に設けられた第３のアンテナ素子と、前記第３給電部の幅方向において離間して対向する位置に、導電性の放熱シートと一体化された無給電素子をGNDに接地し、前記第３のアンテナ素子と前記無給電素子の開放端での結合により、広帯域化を図ることを特徴とする折畳み式携帯無線機。 A foldable portable wireless device having a mechanism that is openable and closable by connecting a first housing and a second housing by a hinge portion, and a third antenna provided at a lower portion of the second housing A parasitic element integrated with a conductive heat-dissipating sheet is grounded to GND at a position facing the element and spaced apart in the width direction of the third feeding part, and the third antenna element and the parasitic element A foldable portable wireless device characterized in that a wide band is achieved by coupling at the open end of the. 前記第２の筺体に設けられた導体素子と、前記導体素子と電気的に接続した第２給電部を有し、前記第１の筐体と前記第２の筐体が開かれた状態のときに、前記導体素子と共にダイポールアンテナを構成する、前記第１の筺体に設けられた板状導体からなる第１アンテナ素子と、前記第１アンテナ素子と電気的に接続した第１給電部を有し、前記第１アンテナ素子及び前記第３アンテナ素子は、リアクタンス素子を装荷したモノポールアンテナで構成され、前記第１、第２、第３のアンテナ素子は、それぞれが多共振のアンテナであることを特徴とする折畳み式携帯無線機。 When the first casing and the second casing are in an open state, having a conductor element provided in the second casing and a second feeding portion electrically connected to the conductor element And a first antenna element comprising a plate-like conductor provided on the first housing, which constitutes a dipole antenna together with the conductor element, and a first feeding portion electrically connected to the first antenna element. The first antenna element and the third antenna element are monopole antennas loaded with reactance elements, and each of the first, second, and third antenna elements is a multi-resonant antenna. A foldable portable radio. 請求項１記載の折畳み式携帯無線機において、前記第１アンテナ素子又は前記第２アンテナ素子、および前記第３アンテナ素子のいずれかを選択するスイッチ手段を備え、前記第１アンテナ素子又は前記第３アンテナ素子が選択された場合は、前記第３給電部の幅方向において離間して対向する位置に配置した前記無給電素子の効果により、前記第１アンテナ又は前記第３アンテナの金属板上での利得を向上させることを特徴とする折畳み式携帯無線機。 2. The foldable portable wireless device according to claim 1, further comprising switch means for selecting any one of the first antenna element, the second antenna element, and the third antenna element, and the first antenna element or the third antenna element. When an antenna element is selected, due to the effect of the parasitic element disposed at a position facing and spaced apart in the width direction of the third feeding part, the first antenna or the third antenna on the metal plate A foldable portable wireless device characterized by improving gain.
JP2006114190A 2006-04-18 2006-04-18 Antenna for portable radio Pending JP2007288561A (en)

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