JP2000124728A - Multi-frequency shared antenna device - Google Patents
Multi-frequency shared antenna deviceInfo
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- JP2000124728A JP2000124728A JP10294983A JP29498398A JP2000124728A JP 2000124728 A JP2000124728 A JP 2000124728A JP 10294983 A JP10294983 A JP 10294983A JP 29498398 A JP29498398 A JP 29498398A JP 2000124728 A JP2000124728 A JP 2000124728A
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- Prior art keywords
- circuit
- circuit board
- antenna device
- radiation plate
- impedance
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、携帯電話等の小
形無線端末に用いるのに適した多周波共用アンテナ装置
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-frequency antenna device suitable for use in small wireless terminals such as mobile phones.
【０００２】[0002]
【従来の技術】従来の多周波共用アンテナ装置の形状と
して、例えば、特開平６−２２４６１８号に掲載された
ものがあり、図８はその概略構成図である。１６は板状
導体、１７は容量、１８は給電点、１９はスイッチ、２
０は仮想地板、２１は励振源である。本アンテナ装置は
仮想地板２０の上方に設置された板状導体１６を、励振
源２１と給電点１８で接続し、仮想地板２０との間にス
イッチ１９と結合した容量１７を複数異なる点で接続す
る構造をなす。複数のスイッチ１９のＯＮ，ＯＦＦの組
み合わせにより、等価的に給電点１８からみた電気長を
変化させ、アンテナ装置のインピーダンスを変化させる
ことが可能である。2. Description of the Related Art As a shape of a conventional multi-frequency antenna device, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 6-224618, and FIG. 8 is a schematic configuration diagram thereof. 16 is a plate-like conductor, 17 is a capacitance, 18 is a feeding point, 19 is a switch,
0 is a virtual ground plane, and 21 is an excitation source. In this antenna device, a plate-shaped conductor 16 installed above a virtual ground plane 20 is connected to an excitation source 21 at a feeding point 18, and a capacitance 17 coupled to a switch 19 is connected between the virtual ground plane 20 and a plurality of different points. Make the structure to be. By the combination of ON and OFF of the plurality of switches 19, it is possible to equivalently change the electrical length viewed from the feeding point 18 and change the impedance of the antenna device.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記し
たような従来の多周波共用アンテナ装置では変化させる
インピーダンスの数だけスイッチ１９、及び容量１７が
必要であり、かつ板状導体１６とスイッチ１９を給電点
１８以外の点で接続する必要があり、工作上の煩雑さが
増大するという問題が生じる。However, in the conventional multi-frequency antenna device as described above, the switches 19 and the capacitors 17 are required by the number of impedances to be changed, and the plate-like conductor 16 and the switch 19 are fed. The connection must be made at a point other than the point 18, which causes a problem that the complexity of the work increases.
【０００４】本発明は上記従来例の欠点を除去するため
になされたもので、構造が単純で製造が容易な多周波共
用アンテナ装置を提供することを目的とする。さらに、
多周波共用アンテナ装置の高効率化を目的とする。さら
に、また、多周波共用アンテナ装置の低姿勢化並びに小
形化を目的とする。SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art, and has as its object to provide a multi-frequency antenna device which has a simple structure and is easy to manufacture. further,
An object is to increase the efficiency of a multi-frequency antenna device. Still another object of the present invention is to reduce the height and size of the multi-frequency antenna device.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、請求項１に係わる多周波共用アンテナ装置は、回路
基板と、前記回路基板上に設置されたＲＦ回路と、前記
回路基板上の接続点で接続され、前記ＲＦ回路を介して
給電される波長に比べて小さい放射板と、前記回路基板
上に設置され、前記接続点と前記ＲＦ回路を接続する線
路に挿入接続されるバイアス電圧により容量の変化する
可変コンデンサを含む整合回路と、前記バイアス電圧を
印加するバイアス回路とを備え、前記放射板のインピー
ダンスと前記ＲＦ回路のインピーダンスとを整合させる
周波数を前記バイアス電圧により設定することを特徴と
するものである。According to a first aspect of the present invention, there is provided a multi-frequency antenna device comprising: a circuit board; an RF circuit installed on the circuit board; A radiation plate that is connected at a connection point and that is smaller than the wavelength fed through the RF circuit, and a bias voltage that is installed on the circuit board and that is inserted and connected to a line that connects the connection point and the RF circuit A matching circuit including a variable capacitor having a variable capacitance, and a bias circuit for applying the bias voltage, wherein a frequency for matching the impedance of the radiation plate and the impedance of the RF circuit is set by the bias voltage. It is a feature.
【０００６】また、請求項２に係わる多周波共用アンテ
ナ装置は、回路基板と、前記回路基板上に設置されたＲ
Ｆ回路と、前記回路基板上の接続点で接続され、前記Ｒ
Ｆ回路を介して給電される波長に比べて小さい放射板
と、前記接続点と前記ＲＦ回路を接続する線路に直列に
挿入接続され、バイアス電圧により容量の変化する可変
コンデンサ、前記可変コンデンサと前記ＲＦ回路の間の
前記線路と前記回路基板の地導体との間に接続され、所
定の周波数に対して設定された誘導素子または容量素子
から成る整合回路と、前記バイアス電圧を印加するバイ
アス回路とを備え、前記放射板のインピーダンスと前記
ＲＦ回路のインピーダンスとを整合させる周波数を前記
バイアス電圧により設定することを特徴とするものであ
る。A multi-frequency antenna device according to a second aspect of the present invention includes a circuit board and an R board mounted on the circuit board.
F circuit and a connection point on the circuit board,
A radiation plate that is smaller than the wavelength fed through the F-circuit, a variable capacitor that is inserted and connected in series to the connection point and a line that connects the RF circuit, and that varies in capacitance according to a bias voltage; A matching circuit that is connected between the line between the RF circuit and the ground conductor of the circuit board and includes an inductive element or a capacitive element set for a predetermined frequency, and a bias circuit that applies the bias voltage; And a frequency for matching the impedance of the radiation plate and the impedance of the RF circuit is set by the bias voltage.
【０００７】また、請求項３に係わる多周波共用アンテ
ナ装置は、請求項１又は請求項２記載の多周波共用アン
テナ装置において、上記整合回路の可変コンデンサと並
列に、誘導素子とＤＣカット用容量素子とが直列接続さ
れた回路を接続したことを特徴とするものである。The multi-frequency antenna device according to the third aspect of the present invention is the multi-frequency antenna device according to the first or second aspect, wherein an inductive element and a DC cut capacitor are provided in parallel with the variable capacitor of the matching circuit. The device is characterized in that a circuit in which the elements are connected in series is connected.
【０００８】また、請求項４に係わる多周波共用アンテ
ナ装置は、回路基板と、前記回路基板上に設置されたＲ
Ｆ回路と、前記回路基板上の接続点で接続され、前記Ｒ
Ｆ回路を介して給電される波長に比べて小さい放射板
と、前記回路基板上に設置され、誘導素子または容量素
子あるいは誘導素子および容量素子から形成された複数
の整合用回路、前記接続点と前記ＲＦ回路を接続する線
路に挿入され、前記複数の整合用回路から所定の整合用
回路を選択し、前記接続点と前記ＲＦ回路を接続する線
路に挿入接続させるスイッチから成る整合回路と、前記
スイッチを制御する制御手段とを備え、前記放射板のイ
ンピーダンスと前記ＲＦ回路のインピーダンスとを整合
させる周波数を前記制御手段により設定することを特徴
とするものである。Further, the multi-frequency antenna device according to a fourth aspect of the present invention includes a circuit board, and an R antenna mounted on the circuit board.
F circuit and a connection point on the circuit board,
A radiation plate smaller than the wavelength fed through the F-circuit, a plurality of matching circuits installed on the circuit board and formed from an inductive element or a capacitive element or an inductive element and a capacitive element, the connection point; A matching circuit that is inserted into a line connecting the RF circuit, selects a predetermined matching circuit from the plurality of matching circuits, and includes a switch inserted and connected to the connection point and the line connecting the RF circuit; Control means for controlling a switch, wherein a frequency for matching the impedance of the radiation plate with the impedance of the RF circuit is set by the control means.
【０００９】また、請求項５に係わる多周波共用アンテ
ナ装置は、請求項４記載の多周波共用アンテナ装置にお
いて、上記スイッチを、ＦＥＴ素子やＰｉｎダイオード
を用いて形成した半導体スイッチとしたことを特徴とす
るものである。A multi-frequency antenna device according to a fifth aspect of the present invention is the multi-frequency antenna device according to the fourth aspect, wherein the switch is a semiconductor switch formed using an FET element or a Pin diode. It is assumed that.
【００１０】また、請求項６に係わる多周波共用アンテ
ナ装置は、請求項１〜５のいずれか１項に記載の多周波
共用アンテナ装置において、上記接続点と上記整合回路
の間に、上記放射板の抵抗値を高めるインピーダンス変
成部を設けたことを特徴とするものである。A multi-frequency antenna according to a sixth aspect of the present invention is the multi-frequency antenna according to any one of the first to fifth aspects, wherein the radiation is provided between the connection point and the matching circuit. An impedance transformer for increasing the resistance value of the plate is provided.
【００１１】また、請求項７に係わる多周波共用アンテ
ナ装置は、請求項１〜６のいずれか１項に記載の多周波
共用アンテナ装置において、上記放射板を使用波長で略
１／４波長の電気長を有する方形導体で形成し、上記回
路基板に概略平行に配置し、かつ、前記方形導体の端部
を上記接続点に接続して逆Ｌアンテナとしたことを特徴
とするものである。According to a seventh aspect of the present invention, there is provided a multi-frequency antenna device according to any one of the first to sixth aspects, wherein the radiating plate is substantially の wavelength in use wavelength. It is formed of a rectangular conductor having an electrical length, is arranged substantially parallel to the circuit board, and is connected to an end of the rectangular conductor at the connection point to form an inverted L antenna.
【００１２】また、請求項８に係わる多周波共用アンテ
ナ装置は、請求項７記載の多周波共用アンテナ装置にお
いて、上記放射板を形成する方形導体の電流経路の伸長
に寄与する位置に、電流の流れる経路を迂回させる切り
欠きを設けたことを特徴とするものである。The multi-frequency antenna device according to claim 8 is the multi-frequency antenna device according to claim 7, wherein the current is transmitted to a position contributing to the extension of the current path of the rectangular conductor forming the radiation plate. A notch is provided to bypass a flowing path.
【００１３】[0013]
【発明の実施の形態】実施の形態１．図１は、この発明
の多周波共用アンテナ装置の実施の形態１を示す概略構
成図であり、１は回路基板、２はＲＦ回路、３は使用波
長に比べて小さい放射板、４は可変容量、５はバイアス
回路、６は誘導素子、７及び８は接点である。回路基板
１にはＲＦ回路２が形成され、接点７と接点８が配置さ
れる。そして、放射板３は回路基板１に接点７を介して
接続される。また、図示のように、ＲＦ回路２と接点７
の間には、接点７と接点８の間に直列に可変容量４が接
続され、接点８とＲＦ回路２の間に誘導素子６が並列に
接続される。さらに、可変容量４には可変容量４の端子
間のバイアス電圧を変化させるためのバイアス回路５が
装荷される。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a schematic diagram showing a first embodiment of a multi-frequency antenna device according to the present invention, wherein 1 is a circuit board, 2 is an RF circuit, 3 is a radiation plate smaller than the wavelength used, and 4 is a variable capacitor. 5 is a bias circuit, 6 is an inductive element, and 7 and 8 are contacts. The RF circuit 2 is formed on the circuit board 1, and the contacts 7 and 8 are arranged. The radiation plate 3 is connected to the circuit board 1 via the contact 7. As shown, the RF circuit 2 and the contact 7
The variable capacitor 4 is connected in series between the contact 7 and the contact 8, and the inductive element 6 is connected in parallel between the contact 8 and the RF circuit 2. Further, the variable capacitance 4 is loaded with a bias circuit 5 for changing a bias voltage between terminals of the variable capacitance 4.
【００１４】次に動作原理について説明する。放射板３
として例えば共振特性を利用したアンテナを用いた場
合、そのインピーダンスの周波数特性を説明するための
等価回路は図２のように誘導素子Ｌ、容量素子Ｃ、抵抗
素子Ｒの直列回路で表すことが可能である。誘導素子Ｌ
と容量素子Ｃは放射板３の周囲に蓄積されるリアクティ
ブなエネルギーを表すものであり、抵抗素子Ｒは放射板
３の放射を表すものである。本等価回路のインピーダン
スＺの周波数特性は次式で表される。Next, the operation principle will be described. Radiating plate 3
For example, when an antenna using resonance characteristics is used, an equivalent circuit for explaining the frequency characteristics of the impedance can be represented by a series circuit of an inductive element L, a capacitive element C, and a resistive element R as shown in FIG. It is. Inductive element L
And the capacitive element C represent reactive energy accumulated around the radiation plate 3, and the resistance element R represents radiation from the radiation plate 3. The frequency characteristic of the impedance Z of the present equivalent circuit is expressed by the following equation.
【００１５】Ｚ＝Ｒ＋ｊ（ωＬ−１／ωＣ） ω＝２πｆZ = R + j (ωL−1 / ωC) ω = 2πf
【００１６】ここで、インピーダンスの実部は周波数ｆ
によって不変であり、虚部は周波数によって変化する。
ある周波数ｆ1 に於いて、接点８から放射板３側を見込
むインピーダンスをＺ1 とする。ここで、誘導素子６は
上記周波数ｆ1 に於いてＺ1とＲＦ回路２のインピーダ
ンスを整合させる値に設定されるものとすると、周波数
ｆ1 においてはＲＦ回路２から放射板３までのインピー
ダンス整合が得られる。次に、ｆ1 と異なる周波数ｆ2
に於ける接点８から放射板３側を見込むインピーダンス
をＺ2 とすると、Ｚ1 とＺ2 は虚部のみ異なる。そこ
で、装荷した可変容量４の端子間のバイアス電圧を変化
させ、可変容量４の容量を変化させることでＺ1 とＺ2
の虚部を一致させてＺ2 をＺ1 に等しくし、周波数ｆ2
に於ける接点８から放射板３側を見込むインピーダンス
をＲＦ回路２のインピーダンスに整合させる。なお、こ
こでは、放射板３のインピーダンスの周波数変化に比
べ、誘導素子６のインピーダンスの周波数変化は無視で
きる程度である。このように可変容量４のバイアス電圧
を変化させることで、この実施の形態１の多周波共用ア
ンテナ装置はｆ1 とｆ2 の異なる周波数並びに異なる複
数の周波数において用いることが可能となり、逆に可変
容量４のバイアス電圧により使用周波数が設定されるこ
ととなる。また、以上の説明では誘導素子６を用いる場
合を示したが、これに代えて容量素子を用いても同様に
機能させることができる。Here, the real part of the impedance is the frequency f
And the imaginary part changes with frequency.
At a certain frequency f1, the impedance from the contact 8 to the radiation plate 3 side is Z1. Here, assuming that the inductive element 6 is set to a value that matches Z1 with the impedance of the RF circuit 2 at the frequency f1, impedance matching from the RF circuit 2 to the radiation plate 3 is obtained at the frequency f1. . Next, a frequency f2 different from f1
Assuming that the impedance seen from the contact 8 at the side of the radiation plate 3 is Z2, Z1 and Z2 differ only in the imaginary part. Therefore, by changing the bias voltage between the terminals of the loaded variable capacitor 4 and changing the capacitance of the variable capacitor 4, Z1 and Z2 are changed.
To make Z2 equal to Z1 and the frequency f2
The impedance seen from the contact 8 at the side of the radiation plate 3 is matched with the impedance of the RF circuit 2. Here, the frequency change of the impedance of the inductive element 6 is negligible compared to the frequency change of the impedance of the radiation plate 3. By changing the bias voltage of the variable capacitor 4 in this manner, the multi-frequency antenna device according to the first embodiment can be used at different frequencies f1 and f2 and at a plurality of different frequencies. The use frequency is set by the bias voltage. In the above description, the case where the inductive element 6 is used has been described. However, the same function can be obtained by using a capacitor instead.
【００１７】以上のように、実施の形態１の多周波共用
アンテナ装置は、放射板の周囲に蓄積されるリアクティ
ブなエネルギーの周波数変化を可変容量にて相殺させ、
複数の周波数に於いて放射板のインピーダンスとＲＦ回
路のインピーダンスを整合させることが可能であり、逆
に可変容量のバイアス電圧により使用周波数が設定され
ることとなる。ここで、放射板に付加される可変容量及
びバイアス回路は、回路基板上の接点とＲＦ回路との間
に設置されるため、回路基板のエッチング技術、部品の
実装技術などにより構成可能であり、構造が単純で製造
が容易な多周波共用アンテナ装置を得られる効果があ
る。なお、コストの増大を防ぐことも可能である。As described above, in the multi-frequency antenna device according to the first embodiment, the frequency change of the reactive energy accumulated around the radiation plate is canceled by the variable capacitance.
The impedance of the radiation plate and the impedance of the RF circuit can be matched at a plurality of frequencies, and the operating frequency is set by the bias voltage of the variable capacitor. Here, since the variable capacitance and the bias circuit added to the radiation plate are installed between the contact on the circuit board and the RF circuit, the variable capacitance and the bias circuit can be configured by a circuit board etching technique, a component mounting technique, and the like. There is an effect that a multi-frequency antenna device having a simple structure and easy to manufacture can be obtained. Note that it is also possible to prevent an increase in cost.
【００１８】実施の形態２．図３は、この発明の多周波
共用アンテナ装置の実施の形態２を示す概略構成図であ
り、１は回路基板、２はＲＦ回路、３は使用波長に比べ
て小さい放射板、４は可変容量、５はバイアス回路、６
は誘導素子、７及び８は接点、９は誘導素子、１０は容
量素子である。そして、放射板３は回路基板１に接点７
を介して接続される。また、図示のように、ＲＦ回路２
と接点７の間には、接点７と接点８の間に直列に可変容
量４が接続され、接点８とＲＦ回路２の間に誘導素子６
が並列に接続される。さらに、可変容量４には可変容量
４の端子間のバイアス電圧を変化させるためのバイアス
回路５が装荷される。また、この実施の形態２では、一
端にＤＣ遮断用の容量素子１０が接続された誘導素子９
が可変容量４に並列に接続されている。Embodiment 2 FIG. FIG. 3 is a schematic diagram showing a second embodiment of the multi-frequency antenna device according to the present invention, wherein 1 is a circuit board, 2 is an RF circuit, 3 is a radiation plate smaller than the wavelength used, and 4 is a variable capacitor. 5 is a bias circuit, 6
Is an inductive element, 7 and 8 are contacts, 9 is an inductive element, and 10 is a capacitive element. The radiating plate 3 is connected to the circuit board 1 by a contact 7.
Connected via As shown in the figure, the RF circuit 2
A variable capacitor 4 is connected between the contact 7 and the contact 8 in series between the contact 7 and the contact 8, and an inductive element 6 is connected between the contact 8 and the RF circuit 2.
Are connected in parallel. Further, the variable capacitance 4 is loaded with a bias circuit 5 for changing a bias voltage between terminals of the variable capacitance 4. In the second embodiment, the inductive element 9 having one end connected to the capacitive element 10 for blocking DC power.
Are connected in parallel to the variable capacitor 4.
【００１９】次に動作について説明する。基本的な動作
原理は実施の形態１と同様である。本実施の形態では、
可変容量４に並列に誘導素子９を接続することにより、
可変容量４と誘導素子９の並列共振特性を利用し、可変
容量４のバイアス電圧に対する容量変化を等価的に大き
くしたものである。このため、本実施の形態の多周波共
用アンテナ装置は実施の形態１のものよりも広い周波数
範囲でインピーダンス整合を実現することが可能とな
る。Next, the operation will be described. The basic operation principle is the same as in the first embodiment. In the present embodiment,
By connecting the inductive element 9 to the variable capacitor 4 in parallel,
The change in capacitance of the variable capacitor 4 with respect to the bias voltage is equivalently increased using the parallel resonance characteristics of the variable capacitor 4 and the inductive element 9. For this reason, the multi-frequency antenna device according to the present embodiment can achieve impedance matching over a wider frequency range than that of the first embodiment.
【００２０】実施の形態３．図４は、この発明の多周波
共用アンテナ装置の実施の形態３を示す概略構成図であ
り、１は回路基板、２はＲＦ回路、３は使用波長に比べ
て小さい放射板、４は可変容量、５はバイアス回路、６
は誘導素子、７及び８は接点、１１は誘導素子である。
そして、放射板３は回路基板１に接点７を介して接続さ
れる。また、図示のように、ＲＦ回路２と接点７の間に
は、接点７と接点８の間に直列に可変容量４が接続さ
れ、接点８とＲＦ回路２の間に誘導素子６が並列に接続
される。さらに、可変容量４には可変容量４の端子間の
バイアス電圧を変化させるためのバイアス回路５が装荷
される。また、接点７と可変容量４の間に誘導素子１１
が並列に接続される。Embodiment 3 FIG. 4 is a schematic configuration diagram showing a third embodiment of the multi-frequency antenna device according to the present invention, wherein 1 is a circuit board, 2 is an RF circuit, 3 is a radiation plate smaller than the wavelength used, and 4 is a variable capacitor. 5 is a bias circuit, 6
Is an inductive element, 7 and 8 are contacts, and 11 is an inductive element.
The radiation plate 3 is connected to the circuit board 1 via the contact 7. As shown, a variable capacitor 4 is connected between the RF circuit 2 and the contact 7 in series between the contact 7 and the contact 8, and an inductive element 6 is connected in parallel between the contact 8 and the RF circuit 2. Connected. Further, the variable capacitance 4 is loaded with a bias circuit 5 for changing a bias voltage between terminals of the variable capacitance 4. Further, an inductive element 11 is provided between the contact 7 and the variable capacitor 4.
Are connected in parallel.
【００２１】次に動作について説明する。基本的な動作
原理は実施の形態１と同様である。ここで、使用波長に
比べて小さい放射板３のインピーダンスは、一般的に図
２に示した等価回路に於ける抵抗素子Ｒの抵抗値が小さ
く、可変容量４は放射板３の抵抗値に比べて無視できな
いレベルの抵抗値を有する場合がある。このような場合
には可変容量４による熱損が増大し、アンテナ装置の効
率が低下する。このため、本実施の形態に示した多周波
共用アンテナ装置では、誘導素子１１によるインピーダ
ンス変換により放射板３の抵抗値を高めて上記可変容量
４による熱損失を低減することにより、高効率化を図る
ことができる。なお、この実施の形態３ではインピーダ
ンス変換を誘導素子１１により行なう例を示して説明し
たが、これに限らず、インピーダンス変換機能を有する
インピーダンス変成部を設ければ良い。Next, the operation will be described. The basic operation principle is the same as in the first embodiment. Here, the impedance of the radiation plate 3 smaller than the wavelength used is generally smaller than the resistance value of the resistance element R in the equivalent circuit shown in FIG. May have a resistance value that cannot be ignored. In such a case, heat loss due to the variable capacitor 4 increases, and the efficiency of the antenna device decreases. For this reason, in the multi-frequency antenna device shown in the present embodiment, the efficiency is improved by increasing the resistance value of the radiation plate 3 by impedance conversion by the inductive element 11 and reducing the heat loss by the variable capacitor 4. Can be planned. In the third embodiment, an example in which the impedance conversion is performed by the inductive element 11 has been described. However, the present invention is not limited to this, and an impedance transformer having an impedance conversion function may be provided.
【００２２】実施の形態４．図５は、この発明の多周波
共用アンテナ装置の実施の形態４を示す概略構成図であ
り、１は回路基板、２はＲＦ回路、３は使用波長に比べ
て小さい放射板、７は接点、１１は誘導素子、１２はス
イッチ、１３は誘導素子、容量素子を２つ組み合わせて
さまざまに構成された整合用回路である。そして、放射
板３は回路基板１に接点７を介して接続される。また、
図示のように、回路基板１の接点７とＲＦ回路２との間
には、接点７側に誘導素子１１が並列に接続され、ＲＦ
回路２側にスイッチ１２により選択される整合用回路１
３が直列に挿入接続される。Embodiment 4 FIG. 5 is a schematic configuration diagram showing Embodiment 4 of the multi-frequency antenna device of the present invention, wherein 1 is a circuit board, 2 is an RF circuit, 3 is a radiation plate smaller than the wavelength used, 7 is a contact, Reference numeral 11 denotes an inductive element, 12 denotes a switch, and 13 denotes a matching circuit that is variously configured by combining two inductive elements and capacitive elements. The radiation plate 3 is connected to the circuit board 1 via the contact 7. Also,
As shown in the figure, between the contact 7 of the circuit board 1 and the RF circuit 2, an inductive element 11 is connected in parallel to the contact 7 side,
Matching circuit 1 selected by switch 12 on circuit 2 side
3 are connected in series.
【００２３】次に動作について説明する。本実施の形態
では、誘導素子、容量素子を２つ組み合わせてさまざま
に構成された整合用回路１３の中からスイッチ１２によ
り選択した整合用回路１３を挿入接続させることができ
るように構成しているため、複数の周波数に対して変化
する放射板３のインピーダンスをＲＦ回路２のインピー
ダンスに整合させることが可能であり、アンテナ装置を
複数の周波数において使用することが可能となる。ま
た、逆にスイッチ１２による挿入する整合用回路１３の
切り換えにより使用周波数が設定されることとなる。な
お、周波数に応じて所定の整合用回路１３を選択して切
り換えるスイッチ１２の制御は、スイッチ１２を制御す
る制御手段（図示省略）により行なう。また、スイッチ
１２は、スイッチ素子としてＦＥＴ素子やＰｉｎダイオ
ードなどを用いて形成された半導体スイッチで構成する
ことができる。ここで、使用波長に比べて小さい放射板
３のインピーダンスは、一般的に図２に示した等価回路
に於ける抵抗素子Ｒの抵抗値が小さく、スイッチ１２は
放射板３の抵抗値と比べて無視できないレベルの抵抗値
を有する。このため、本実施の形態に示した多周波共用
アンテナ装置では、誘導素子１１によるインピーダンス
変換により放射板３の抵抗値を高めることによりスイッ
チ１２における損失を低減し、高効率化を図ることがで
きる。Next, the operation will be described. In the present embodiment, the configuration is such that the matching circuit 13 selected by the switch 12 can be inserted and connected from among variously configured matching circuits 13 by combining two inductive elements and capacitive elements. Therefore, it is possible to match the impedance of the radiation plate 3 that changes with respect to a plurality of frequencies to the impedance of the RF circuit 2, and to use the antenna device at a plurality of frequencies. Conversely, the frequency used is set by switching the matching circuit 13 to be inserted by the switch 12. The control of the switch 12 for selecting and switching the predetermined matching circuit 13 according to the frequency is performed by control means (not shown) for controlling the switch 12. Further, the switch 12 can be configured by a semiconductor switch formed using a FET element, a Pin diode, or the like as a switch element. Here, the impedance of the radiation plate 3 which is smaller than the wavelength used is generally smaller than the resistance value of the resistance element R in the equivalent circuit shown in FIG. It has a resistance level that cannot be ignored. For this reason, in the multi-frequency antenna device shown in the present embodiment, the loss in the switch 12 can be reduced by increasing the resistance value of the radiation plate 3 by impedance conversion by the inductive element 11, and high efficiency can be achieved. .
【００２４】実施の形態５．図６は、この発明の多周波
共用アンテナ装置の実施の形態５を示す概略構成図であ
り、１は回路基板、２はＲＦ回路、４は可変容量、５は
バイアス回路、６は誘導素子、７及び８は接点、１４は
放射板である。放射板１４は略１／４波長の電気長を有
する方形導体により構成され、回路基板１に概略平行に
配置され、かつ、方形導体の端部で回路基板１に接点７
を介して接続され、逆Ｌアンテナを形成する。また、図
示のように、ＲＦ回路２と接点７の間には、接点７と接
点８の間に直列に可変容量４が接続され、接点８とＲＦ
回路２の間に誘導素子６が並列に接続される。さらに、
可変容量４には可変容量４の端子間のバイアス電圧を変
化させるためのバイアス回路５が装荷される。Embodiment 5 FIG. 6 is a schematic configuration diagram showing Embodiment 5 of the multi-frequency antenna device of the present invention, wherein 1 is a circuit board, 2 is an RF circuit, 4 is a variable capacitor, 5 is a bias circuit, 6 is an inductive element, 7 and 8 are contact points, and 14 is a radiation plate. The radiating plate 14 is formed of a rectangular conductor having an electrical length of about 1/4 wavelength, is disposed substantially parallel to the circuit board 1, and has a contact 7 at the end of the rectangular conductor with the circuit board 1.
And form an inverted L antenna. As shown in the figure, between the RF circuit 2 and the contact 7, a variable capacitor 4 is connected in series between the contact 7 and the contact 8, and the contact 8 and the RF
Inductive elements 6 are connected in parallel between the circuits 2. further,
The variable capacitor 4 is loaded with a bias circuit 5 for changing a bias voltage between terminals of the variable capacitor 4.
【００２５】本実施の形態の基本的な動作原理は実施の
形態１と同様であり、実施の形態１と同様の効果があ
る。さらに、本実施の形態では、放射板１４を略１／４
波長の電気長を有する方形導体により構成し、回路基板
１に概略平行に配置する構成とすることで、多周波共用
アンテナ装置を低姿勢化する効果がある。The basic operation principle of this embodiment is the same as that of the first embodiment, and has the same effect as that of the first embodiment. Further, in the present embodiment, the radiation plate 14 is substantially
By using a rectangular conductor having an electrical length of the wavelength and being arranged substantially parallel to the circuit board 1, there is an effect of lowering the attitude of the multi-frequency antenna device.
【００２６】実施の形態６．図７は、この発明の多周波
共用アンテナ装置の実施の形態６を示す概略構成図であ
り、１５は放射板である。なお、放射板１５以外は前記
実施の形態５で示した図６と同様である。放射板１５は
略１／４波長の電気長を有する方形導体により構成さ
れ、回路基板１に概略平行に配置され、かつ、方形導体
の端部で回路基板１に接点７を介して接続され、逆Ｌア
ンテナを形成する。また、放射板１５には電流経路の伸
長に寄与する位置に電流の流れる経路を迂回させる切り
欠きを設けてある。Embodiment 6 FIG. FIG. 7 is a schematic configuration diagram showing Embodiment 6 of the multi-frequency antenna device according to the present invention, and 15 is a radiation plate. The components other than the radiation plate 15 are the same as those in FIG. 6 described in the fifth embodiment. The radiating plate 15 is formed of a rectangular conductor having an electrical length of approximately 波長 wavelength, is disposed substantially parallel to the circuit board 1, and is connected to the circuit board 1 via a contact 7 at an end of the rectangular conductor. Form an inverted L antenna. Further, the radiation plate 15 is provided with a notch at a position contributing to the extension of the current path to bypass the path through which the current flows.
【００２７】本実施の形態の基本的な動作原理は実施の
形態１と同様であり、実施の形態１と同様の効果があ
る。さらに、本実施の形態では、放射板１５を電流経路
の伸長に寄与する位置に切り欠きを設けて略１／４波長
の電気長を有する方形導体により構成し、回路基板１に
概略平行に配置する構成としたので、電流の流れる経路
が迂回して等価的な電気長が長くなるため、切り欠きを
設けない場合に比べ同じ共振周波数に対して放射板１５
を小形化でき、多周波共用アンテナ装置を低姿勢化する
と共により小形化できる効果がある。The basic operation principle of this embodiment is the same as that of the first embodiment, and has the same effect as that of the first embodiment. Further, in the present embodiment, the radiation plate 15 is formed of a rectangular conductor having an electrical length of approximately 波長 wavelength by providing a cutout at a position contributing to the extension of the current path, and is arranged substantially parallel to the circuit board 1. With this configuration, the path through which the current flows is bypassed, and the equivalent electrical length becomes longer.
And the multi-frequency antenna device can be downsized and downsized.
【００２８】以上に実施の形態１〜６を図を用いて説明
したが、実施の形態２で示した誘導素子９および容量素
子１０による構成、実施の形態３で示したインピーダン
ス変成部の構成、実施の形態５で示した放射板１４の構
成、並びに実施の形態６で示した放射板１５の構成など
は、他の実施の形態との組み合せが可能である。The first to sixth embodiments have been described with reference to the drawings. However, the configuration using the inductive element 9 and the capacitive element 10 shown in the second embodiment, the configuration of the impedance transformer shown in the third embodiment, The configuration of the radiation plate 14 described in the fifth embodiment, the configuration of the radiation plate 15 described in the sixth embodiment, and the like can be combined with other embodiments.
【００２９】[0029]
【発明の効果】以上のように、この発明の多周波共用ア
ンテナ装置では、放射板とＲＦ回路との間に設置される
整合回路は、回路基板のエッチング技術、部品の実装技
術などにより構成可能であり、構造が単純で製造が容易
な多周波共用アンテナ装置を得られる効果がある。As described above, in the multi-frequency antenna device according to the present invention, the matching circuit provided between the radiation plate and the RF circuit can be formed by a circuit board etching technique, a component mounting technique, or the like. Thus, there is an effect that a multi-frequency antenna device having a simple structure and easy manufacture can be obtained.
【００３０】また、請求項３の発明によれば、整合回路
の可変コンデンサと並列に、誘導素子とＤＣカット用容
量素子とが直列接続された回路を接続したので、より広
い周波数範囲でインピーダンス整合を実現することが可
能となる。According to the third aspect of the present invention, since a circuit in which an inductive element and a DC cut capacitive element are connected in series is connected in parallel with the variable capacitor of the matching circuit, impedance matching can be performed in a wider frequency range. Can be realized.
【００３１】また、請求項６の発明によれば、接続点と
整合回路の間に、放射板の抵抗値を高めるインピーダン
ス変成部を設けたので、整合回路における抵抗分による
損失を低減でき、高効率化を図ることができる。According to the sixth aspect of the present invention, since the impedance transformer for increasing the resistance of the radiation plate is provided between the connection point and the matching circuit, the loss due to the resistance in the matching circuit can be reduced. Efficiency can be improved.
【００３２】また、請求項７の発明によれば、放射板を
使用波長で略１／４波長の電気長を有する方形導体で形
成し、回路基板に概略平行に配置し、かつ、前記方形導
体の端部を接続点に接続して逆Ｌアンテナとしたので、
多周波共用アンテナ装置を低姿勢化する効果がある。According to the seventh aspect of the present invention, the radiating plate is formed of a rectangular conductor having an electrical length of about 1/4 wavelength at a working wavelength, and is disposed substantially parallel to a circuit board. Is connected to the connection point to form an inverted L antenna,
This has the effect of lowering the attitude of the multi-frequency antenna device.
【００３３】また、請求項８の発明によれば、放射板を
形成する方形導体の電流経路の伸長に寄与する位置に、
電流の流れる経路を迂回させる切り欠きを設けたので、
切り欠きを設けない場合に比べ同じ共振周波数に対して
放射板を小形化でき、多周波共用アンテナ装置を低姿勢
化すると共により小形化できる効果がある。According to the eighth aspect of the present invention, the position of the rectangular conductor forming the radiation plate, which contributes to the extension of the current path,
Since a notch was provided to bypass the current flow path,
The radiation plate can be miniaturized for the same resonance frequency as compared with the case where the notch is not provided, and there is an effect that the multi-frequency antenna device can be downsized and miniaturized.
【図１】 この発明の実施の形態１を示す概略構成図で
ある。FIG. 1 is a schematic configuration diagram showing Embodiment 1 of the present invention.
【図２】 この発明の多周波共用アンテナ装置における
放射板のインピーダンスの周波数特性を説明するための
等価回路を示す図である。FIG. 2 is a diagram showing an equivalent circuit for explaining frequency characteristics of impedance of a radiation plate in the multi-frequency antenna device of the present invention.
【図３】 この発明の実施の形態２を示す概略構成図で
ある。FIG. 3 is a schematic configuration diagram showing Embodiment 2 of the present invention.
【図４】 この発明の実施の形態３を示す概略構成図で
ある。FIG. 4 is a schematic configuration diagram showing a third embodiment of the present invention.
【図５】 この発明の実施の形態４を示す概略構成図で
ある。FIG. 5 is a schematic configuration diagram showing a fourth embodiment of the present invention.
【図６】 この発明の実施の形態５を示す概略構成図で
ある。FIG. 6 is a schematic configuration diagram showing a fifth embodiment of the present invention.
【図７】 この発明の実施の形態６を示す概略構成図で
ある。FIG. 7 is a schematic configuration diagram showing a sixth embodiment of the present invention.
【図８】 従来の多周波共用アンテナ装置を示す概略構
成図である。FIG. 8 is a schematic configuration diagram showing a conventional multi-frequency antenna device.
１ 回路基板、２ ＲＦ回路、３ 放射板、４ 可変容
量、５ バイアス回路、６ 誘導素子、７ 接点、８
接点、９ 誘導素子、１０ 容量素子、１１ 誘導素
子、１２ スイッチ、１３ 整合用回路、１４放射板、
１５ 放射板、１６ 板状導体、１７ 容量、１８ 給
電点、１９ スイッチ、２０ 仮想地板、２１ 励振
源。REFERENCE SIGNS LIST 1 circuit board, 2 RF circuit, 3 radiation plate, 4 variable capacitance, 5 bias circuit, 6 inductive element, 7 contacts, 8
Contacts, 9 inductive elements, 10 capacitive elements, 11 inductive elements, 12 switches, 13 matching circuits, 14 radiation plates,
15 radiation plate, 16 plate conductor, 17 capacity, 18 feeding point, 19 switch, 20 virtual ground plane, 21 excitation source.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小森 絵里子 東京都千代田区丸の内二丁目２番３号 三 菱電機株式会社内 (72)発明者 武富 浩一 東京都千代田区丸の内二丁目２番３号 三 菱電機株式会社内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Eriko Komori 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Koichi Taketomi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Ryo Denki Co., Ltd.
Claims (8)
たＲＦ回路と、前記回路基板上の接続点で接続され、前
記ＲＦ回路を介して給電される波長に比べて小さい放射
板と、前記回路基板上に設置され、前記接続点と前記Ｒ
Ｆ回路を接続する線路に挿入接続されるバイアス電圧に
より容量の変化する可変コンデンサを含む整合回路と、
前記バイアス電圧を印加するバイアス回路とを備え、前
記放射板のインピーダンスと前記ＲＦ回路のインピーダ
ンスとを整合させる周波数を前記バイアス電圧により設
定することを特徴とする多周波共用アンテナ装置。1. A circuit board, an RF circuit installed on the circuit board, and a radiation plate connected at a connection point on the circuit board and smaller than a wavelength fed through the RF circuit, Being mounted on the circuit board, the connection point and the R
A matching circuit including a variable capacitor whose capacity changes according to a bias voltage inserted and connected to a line connecting the F circuit;
And a bias circuit for applying the bias voltage, wherein a frequency for matching the impedance of the radiation plate and the impedance of the RF circuit is set by the bias voltage.
たＲＦ回路と、前記回路基板上の接続点で接続され、前
記ＲＦ回路を介して給電される波長に比べて小さい放射
板と、前記接続点と前記ＲＦ回路を接続する線路に直列
に挿入接続され、バイアス電圧により容量の変化する可
変コンデンサ、前記可変コンデンサと前記ＲＦ回路の間
の前記線路と前記回路基板の地導体との間に接続され、
所定の周波数に対して設定された誘導素子または容量素
子から成る整合回路と、前記バイアス電圧を印加するバ
イアス回路とを備え、前記放射板のインピーダンスと前
記ＲＦ回路のインピーダンスとを整合させる周波数を前
記バイアス電圧により設定することを特徴とする多周波
共用アンテナ装置。2. A circuit board, an RF circuit installed on the circuit board, and a radiation plate connected at a connection point on the circuit board, the radiation plate being smaller than a wavelength fed through the RF circuit, A variable capacitor that is inserted and connected in series to a line connecting the connection point and the RF circuit, and that has a capacitance that changes according to a bias voltage, between the line between the variable capacitor and the RF circuit and a ground conductor of the circuit board; Connected to
A matching circuit comprising an inductive element or a capacitive element set for a predetermined frequency, and a bias circuit for applying the bias voltage, wherein the frequency for matching the impedance of the radiation plate and the impedance of the RF circuit is A multi-frequency antenna device characterized by being set by a bias voltage.
アンテナ装置において、上記整合回路の可変コンデンサ
と並列に、誘導素子とＤＣカット用容量素子とが直列接
続された回路を接続したことを特徴とする多周波共用ア
ンテナ装置。3. The multi-frequency antenna device according to claim 1, wherein a circuit in which an inductive element and a DC cut capacitive element are connected in series is connected in parallel with the variable capacitor of the matching circuit. A multi-frequency antenna device comprising:
たＲＦ回路と、前記回路基板上の接続点で接続され、前
記ＲＦ回路を介して給電される波長に比べて小さい放射
板と、前記回路基板上に設置され、誘導素子または容量
素子あるいは誘導素子および容量素子から形成された複
数の整合用回路、前記接続点と前記ＲＦ回路を接続する
線路に挿入され、前記複数の整合用回路から所定の整合
用回路を選択し、前記接続点と前記ＲＦ回路を接続する
線路に挿入接続させるスイッチから成る整合回路と、前
記スイッチを制御する制御手段とを備え、前記放射板の
インピーダンスと前記ＲＦ回路のインピーダンスとを整
合させる周波数を前記制御手段により設定することを特
徴とする多周波共用アンテナ装置。4. A circuit board, an RF circuit installed on the circuit board, and a radiation plate connected at a connection point on the circuit board and smaller than a wavelength fed through the RF circuit, A plurality of matching circuits installed on the circuit board and formed from an inductive element or a capacitive element or an inductive element and a capacitive element; and the plurality of matching circuits inserted into a line connecting the connection point and the RF circuit. A matching circuit comprising a switch for selecting and connecting a predetermined matching circuit from the connection point and a line connecting the RF circuit, and a control means for controlling the switch, the impedance of the radiation plate and the impedance A multi-frequency antenna device, wherein a frequency for matching the impedance of an RF circuit is set by the control means.
において、上記スイッチを、ＦＥＴ素子やＰｉｎダイオ
ードを用いて形成した半導体スイッチとしたことを特徴
とする多周波共用アンテナ装置。5. The multi-frequency antenna device according to claim 4, wherein said switch is a semiconductor switch formed using an FET element or a Pin diode.
周波共用アンテナ装置において、上記接続点と上記整合
回路の間に、上記放射板の抵抗値を高めるインピーダン
ス変成部を設けたことを特徴とする多周波共用アンテナ
装置。6. The multi-frequency antenna according to claim 1, further comprising: an impedance transformer for increasing a resistance value of the radiation plate between the connection point and the matching circuit. A multi-frequency antenna device characterized by the above-mentioned.
周波共用アンテナ装置において、上記放射板を使用波長
で略１／４波長の電気長を有する方形導体で形成し、上
記回路基板に概略平行に配置し、かつ、前記方形導体の
端部を上記接続点に接続して逆Ｌアンテナとしたことを
特徴とする多周波共用アンテナ装置。7. The multi-frequency antenna device according to claim 1, wherein the radiation plate is formed of a rectangular conductor having an electrical length of approximately 波長 wavelength at a working wavelength, and A multi-frequency antenna apparatus, wherein the antenna is arranged substantially parallel to a substrate, and an end of the rectangular conductor is connected to the connection point to form an inverted L antenna.
において、上記放射板を形成する方形導体の電流経路の
伸長に寄与する位置に、電流の流れる経路を迂回させる
切り欠きを設けたことを特徴とする多周波共用アンテナ
装置。8. The multi-frequency antenna device according to claim 7, wherein a notch is provided at a position contributing to the extension of the current path of the rectangular conductor forming the radiating plate so as to bypass the path through which the current flows. Multi-frequency shared antenna device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29498398A JP3513033B2 (en) | 1998-10-16 | 1998-10-16 | Multi-frequency antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29498398A JP3513033B2 (en) | 1998-10-16 | 1998-10-16 | Multi-frequency antenna system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000124728A true JP2000124728A (en) | 2000-04-28 |
| JP3513033B2 JP3513033B2 (en) | 2004-03-31 |
Family
ID=17814837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29498398A Expired - Fee Related JP3513033B2 (en) | 1998-10-16 | 1998-10-16 | Multi-frequency antenna system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3513033B2 (en) |
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