JPH1041704A - Compatible antenna - Google Patents

Compatible antenna

Info

Publication number
JPH1041704A
JPH1041704A JP8212201A JP21220196A JPH1041704A JP H1041704 A JPH1041704 A JP H1041704A JP 8212201 A JP8212201 A JP 8212201A JP 21220196 A JP21220196 A JP 21220196A JP H1041704 A JPH1041704 A JP H1041704A
Authority
JP
Japan
Prior art keywords
band
filter
reception
frequency band
pass
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.)
Granted
Application number
JP8212201A
Other languages
Japanese (ja)
Other versions
JP2901181B2 (en
Inventor
Masahiro Shindo
正弘 進藤
Naoki Kimura
直樹 木村
Mikio Takano
三樹男 高野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GOYO DENSHI KOGYO KK
Original Assignee
GOYO DENSHI KOGYO KK
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 GOYO DENSHI KOGYO KK filed Critical GOYO DENSHI KOGYO KK
Priority to JP8212201A priority Critical patent/JP2901181B2/en
Publication of JPH1041704A publication Critical patent/JPH1041704A/en
Application granted granted Critical
Publication of JP2901181B2 publication Critical patent/JP2901181B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
    • H03H9/72—Networks using surface acoustic waves
    • H03H9/725—Duplexers

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Transceivers (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce the interference between an analog system and a digital system by using a compatible antenna mounted on a portable telephone set also for a composite terminal equipment in the dual mode system of the analog system and the digital system using the same frequency band. SOLUTION: A receiving filter 3 connected to a branching circuit 2 from an antenna 1 is composed of a band attenuation dielectric filter 4 for a high transmission level, and two SAW filters 5 and 6 branch-connected to it. The two SAW filters 5 and 6 use each pass band obtained by dividing the received band into two parts, and the output side is switched by a switcher 9. Thus, inter-channel interference between both systems can be reduced.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、携帯電話機のアン
テナ共用器に関し、特に、８００ＭＨｚ帯，９００ＭＨ
ｚ帯の携帯電話システムで、アナログシステムとディジ
タルシステムが同一周波数帯を共用して運用されるデュ
アルモードシステムの携帯電話機に実装されるアンテナ
共用器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna duplexer for a portable telephone, and more particularly to an 800 MHz band, 900 MHZ.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna duplexer mounted on a dual-mode system mobile phone in which an analog system and a digital system share the same frequency band and operate in a z-band mobile phone system.

【０００２】[0002]

【従来の技術】８００ＭＨｚ帯や９００ＭＨｚ帯のセル
ラ自動車電話・携帯電話方式には国によっていくつかの
方式があり、移動送信，基地送信の周波数帯域がそれぞ
れ設定されている。すなわち、移動機の送信帯域と受信
帯域がそれぞれ定められており、送信帯域の１チャネル
と受信帯域の１チャネルとを用いて同時送受信が行われ
る。そして、この送受信の使用チャネルの間隔は常に一
定になるように制御されている。2. Description of the Related Art There are several types of 800 MHz and 900 MHz cellular cellular telephones and portable telephones depending on the country, and frequency bands for mobile transmission and base transmission are set respectively. That is, the transmission band and the reception band of the mobile device are respectively defined, and simultaneous transmission and reception are performed using one channel of the transmission band and one channel of the reception band. The interval between the channels used for transmission and reception is controlled to be always constant.

【０００３】携帯電話の急激な需要の伸びに対応して、
従来のアナログ方式ではチャネル数が不足するため、よ
り多くのユーザが利用できるディジタル方式に切替えら
れつつある。この移行期では、ディジタル・アナログの
両方式で周波数帯域を共用して運用できる複合端末が必
要になってきた。このようなデュアルモードシステムに
おいても、アナログ方式単独の場合と同様にシステム固
有の周波数間隔で定められたチャネル番号が付与され、
制御されている。従って、アナログ方式は、アナログ方
式固有のチャネル番号を持ち、ディジタル方式は、ディ
ジタル方式固有のチャネル番号を持ち、それぞれのシス
テム基準で制御運用される。In response to the rapid growth of demand for mobile phones,
Since the number of channels is insufficient in the conventional analog method, the digital method is being switched to a digital method that can be used by more users. In this transition period, there has been a need for a composite terminal that can operate by sharing the frequency band in both digital and analog systems. In such a dual mode system as well, a channel number determined by a system-specific frequency interval is given as in the case of the analog system alone,
Is controlled. Therefore, the analog system has a channel number unique to the analog system, and the digital system has a channel number unique to the digital system, and is controlled and operated on a system basis.

【０００４】デュアルモードシステムには、事業者によ
って、アナログ方式と同等のチャネル間隔を持つディジ
タル方式と、広帯域に電波を占有し、例えば、アナログ
方式の数１０チャネルを占有して通信を行うディジタル
方式とがあり、それぞれアナログ方式とデュアルで構成
されるシステムがある。[0004] The dual mode system includes a digital system having a channel interval equivalent to that of the analog system, and a digital system in which radio waves are occupied over a wide band and, for example, occupy tens of channels of the analog system for communication. There are systems that consist of an analog system and a dual system, respectively.

【０００５】アンテナ共用器（デュプレクサ）は送受分
波器ともいわれ、１つのアンテナを送信・受信で共用
し、送信・受信帯域外へのスプリアスの放射，スプリア
ス受信の防止、及び他方式の通信システムからの受信干
渉妨害の軽減、送信時の受信側回路の保護のための装置
である。前述のような自動車電話の移動機や携帯電話機
用のアンテナ共用器として、次のような構成のものが多
い。[0005] An antenna duplexer (duplexer) is also called a transmission / reception splitter, which shares one antenna for transmission and reception, radiates spurious out of the transmission / reception band, prevents spurious reception, and uses other types of communication systems. It is a device for reducing the interference of reception from the receiver and protecting the receiving side circuit at the time of transmission. As the above-mentioned antenna duplexer for a mobile phone of a mobile phone or a mobile phone, there are many of the following configurations.

【０００６】図５は従来のアンテナ共用器の構成例図で
ある。図において、１はアンテナ（ＡＮＴ）、２は分岐
回路、１１は受信帯域信号を通過させ送信帯域信号を減
衰させる受信フィルタ、１２は誘電体同軸共振器を用い
た誘電体フィルタ、１３は送信帯域信号を通過させ受信
帯域信号を減衰させる送信フィルタ、１４は誘電体同軸
共振器を用いた誘電体フィルタ、Ｒｘは受信信号、Ｔｘ
は送信信号である。FIG. 5 is a structural example of a conventional antenna duplexer. In the figure, 1 is an antenna (ANT), 2 is a branch circuit, 11 is a reception filter that passes a reception band signal and attenuates a transmission band signal, 12 is a dielectric filter using a dielectric coaxial resonator, and 13 is a transmission band. A transmission filter that passes a signal and attenuates a reception band signal, 14 is a dielectric filter using a dielectric coaxial resonator, Rx is a reception signal, Tx
Is a transmission signal.

【０００７】アンテナ１より入力された信号は、伝送線
路或いはコイルとコンデンサによる分岐回路２を通り、
受信帯域信号を通過させ送信帯域信号を阻止する高誘電
率低損失のセラミックス材料よりなる帯域通過形誘電体
フィルタ１２に入力され、受信信号Ｒｘを受信機に供給
する。一方、送信信号Ｔｘは、送信帯域信号を通過させ
受信帯域を阻止域とする帯域通過形誘電体フィルタ、又
は低域通過形，高域通過形（適用システムによる）など
の誘電体フィルタ１４を通り、分岐回路２を経てアンテ
ナ１に供給される。A signal input from an antenna 1 passes through a transmission line or a branch circuit 2 composed of a coil and a capacitor.
The signal is input to a band-pass type dielectric filter 12 made of a ceramic material having a high dielectric constant and a low loss, which passes a reception band signal and blocks a transmission band signal, and supplies a reception signal Rx to a receiver. On the other hand, the transmission signal Tx passes through a dielectric filter 14 such as a band-pass type dielectric filter that passes a transmission band signal and uses a reception band as a stop band, or a low-pass type or a high-pass type (depending on an applied system). Are supplied to the antenna 1 via the branch circuit 2.

【０００８】図６は従来のアンテナ共用器の回路例図で
あり、図７は図５，図６の送信フィルタ１３と受信フィ
ルタ１１の減衰特性例図である。この例では、送信フィ
ルタ１３は、３個の誘電体同軸共振器Ｚ1 ，Ｚ2 ，Ｚ3
を用いて受信帯域信号（Ｒｘ）を阻止するＢＥＦ（帯域
阻止フィルタ）特性を有する誘電体フィルタ１４であ
り、受信フィルタ１１は、４個の誘電体同軸共振器Ｚ
4 ，Ｚ5 ，Ｚ6 ，Ｚ7 を用いて受信帯域信号（Ｒｘ）の
みを通過させるＢＰＦ（帯域通過フィルタ）特性を有す
る誘電体フィルタ１２である。FIG. 6 is a circuit diagram of a conventional antenna duplexer, and FIG. 7 is a diagram of attenuation characteristics of the transmission filter 13 and the reception filter 11 of FIGS. In this example, the transmission filter 13 includes three dielectric coaxial resonators Z 1 , Z 2 , and Z 3
Is a dielectric filter 14 having a BEF (Band Rejection Filter) characteristic of blocking a reception band signal (Rx) by using
4 , a dielectric filter 12 having a BPF (band-pass filter) characteristic of passing only a reception band signal (Rx) using Z 5 , Z 6 , and Z 7 .

【０００９】この誘電体フィルタ１２，１４の共振器の
個数（フィルタの段数）は、実用化当初は、送信側が４
段のＢＰＦ，受信側が６段構成のＢＰＦであったが、帯
域阻止フィルタ構成を導入することにより、挿入損失の
低減と小形化が図られ、現在は、送信側が３〜４段構成
のＢＥＦ，受信側が４〜５段のＢＰＦ、又は、ＢＰＦと
ＢＥＦとの組合せ構成となっている。The number of resonators (the number of filter stages) of the dielectric filters 12 and 14 is 4 at the transmission side at the beginning of practical use.
Although the stage BPF and the receiving side are BPFs having a six-stage configuration, the introduction of a band rejection filter configuration can reduce insertion loss and reduce the size. Currently, the BEF with a three- or four-stage configuration on the transmitting side is used. The receiving side has a 4- to 5-stage BPF or a combination of BPF and BEF.

【００１０】前述の運用のとおり、受信帯域内で通信す
る当該チャネルにあっては、全受信帯域内で通信する他
のチャネル周波数は、全て妨害波となり得ることから、
そのレベルの強度によっては、大きな干渉妨害が発生
し、通信不能に至る障害となる機会がある。As described above, in the channel that communicates within the reception band, all other channel frequencies that communicate within the entire reception band can be interference waves.
Depending on the strength of the level, there is a chance that a great interference will occur and become an obstacle to communication failure.

【００１１】特に、アナログ方式とディジタ方式の両方
式のいずれでも通話できるデュアルモードシステムの複
合端末においては、互いに異なる通信方式が同一受信帯
域を共用して通信を行うシステムであることから、一方
の方式の当該チャネルで通信する移動機が他方の方式の
強電界地域に移動したとき、システム間の干渉妨害が発
生し、通信障害を起こす場合がある。Particularly, in a combined terminal of a dual mode system capable of communicating in both the analog system and the digital system, one of the two communication systems uses the same reception band to perform communication by using different communication systems. When a mobile station communicating on the channel of one scheme moves to a strong electric field area of the other scheme, interference between systems may occur, causing a communication failure.

【００１２】[0012]

【発明が解決しようとする課題】上記従来の送受信フィ
ルタ１１，１３は、両方共、立体的な誘電体共振器を利
用した誘電体フィルタであるため、無線機の設計仕様に
より配分された挿入損失と減衰特性の双方を満足させる
ためには、ある大きさ以下にすることができないという
問題がある。すなわち、システムの送信帯域と受信帯域
の間隔と、それぞれの帯域幅（範囲）と周波数離調比と
減衰量から共振器の必要段数が決まり、通過帯域内の挿
入損失を許容値以下にするために共振器の物理的大きさ
が決定ずけられるためである。Since the conventional transmission / reception filters 11 and 13 are both dielectric filters using a three-dimensional dielectric resonator, the insertion loss allocated according to the design specification of the radio is determined. There is a problem that the size cannot be reduced below a certain value in order to satisfy both the characteristics and the attenuation characteristics. That is, the required number of resonators is determined from the interval between the transmission band and the reception band of the system, the respective bandwidths (ranges), the frequency detuning ratio, and the amount of attenuation. This is because the physical size of the resonator cannot be determined.

【００１３】良く知られているとおり、ＢＰＦは、通過
帯域幅を一定として減衰傾度を急峻にすると共振素子の
数（段数）が増える。そして、挿入損失は共振素子の数
に比例して増加する。従って、帯域通過形誘電体フィル
タ，帯域通過形弾性表面波フィルタを問わず、単独でア
ンテナ共用器を構成する場合、減衰傾度を急峻にして帯
域外の減衰量を所要の値にすると、挿入損失の著しい増
加を余儀なくされる。一方、段数を減らして挿入損失を
小さくすると帯域外減衰量が確保できず、共用器の小形
化が阻まれ、結果としてある一定の大きさに制限され
る。As is well known, the BPF increases the number of resonance elements (the number of stages) when the passband width is constant and the attenuation gradient is steep. Then, the insertion loss increases in proportion to the number of the resonance elements. Therefore, regardless of the band-pass type dielectric filter and the band-pass type surface acoustic wave filter, when the antenna duplexer is constituted independently, if the attenuation gradient is steep and the attenuation outside the band is set to a required value, the insertion loss is reduced. Will be forced to increase significantly. On the other hand, if the insertion loss is reduced by reducing the number of stages, the out-of-band attenuation cannot be secured, and the miniaturization of the duplexer is prevented, and as a result, the size is limited to a certain value.

【００１４】現在実用化されているアンテナ共用器は、
より小形化を追求した結果、受信側の帯域通過形誘電体
フィルタ１２の挿入損失が約３〜４ｄＢ、送信側は、帯
域通過形誘電体フィルタの場合約３ｄＢであり、低域通
過又は高域通過フィルタ構成、又は帯域阻止と帯域通過
の組合せ構成の場合２〜３ｄＢであり、これ以上素子を
小さくしたり、素子数を減らしたりして小形化すると、
挿入損失，減衰特性の所要性能を満たすことが困難とな
っている。An antenna duplexer that is currently in practical use is:
As a result of pursuing miniaturization, the insertion loss of the band-pass type dielectric filter 12 on the reception side is about 3 to 4 dB, and the transmission side is about 3 dB in the case of the band-pass type dielectric filter. In the case of a pass filter configuration or a combination configuration of band rejection and band pass, it is 2 to 3 dB. If the element is further reduced or the number of elements is reduced, the size is reduced.
It is difficult to meet the required performance of insertion loss and attenuation characteristics.

【００１５】上記の問題点を解決するため、本願発明者
は、受信フィルタ１１として、１つの帯域通過形誘電体
フィルタ１２の代わりに、送信帯域阻止形の誘電体フィ
ルタと受信帯域通過形ＳＡＷフィルタを縦続接続し、送
信の高電力を１素子の帯域阻止形誘電体フィルタで阻止
し、小形の帯域通過形ＳＡＷフィルタで受信帯域信号を
選択するように構成したアンテナ共用器を先に提案した
（特願平７−２６１０３１号参照）。しかし、前述のよ
うなデュアルモードシステムで用いる複合端末のアンテ
ナ共用器として用いるには、システム間の耐干渉性能を
上げる何らかの工夫が必要であり、単に、複数個の受信
フィルタを付加するだけでは難しいという問題がある。In order to solve the above problems, the inventor of the present application has proposed that the reception filter 11 be replaced with a transmission band rejection type dielectric filter and a reception band pass type SAW filter instead of one band pass type dielectric filter 12. Were cascaded, and a high-frequency transmission power was blocked by a one-element band-stop type dielectric filter, and a small band-pass SAW filter was used to select a reception band signal. See Japanese Patent Application No. 7-261331. However, in order to use it as an antenna duplexer of a complex terminal used in the above-described dual mode system, some measure to increase the interference resistance between the systems is necessary, and it is difficult to simply add a plurality of reception filters. There is a problem.

【００１６】本発明の目的は、送信フィルタと、帯域阻
止形誘電体フィルタとＳＡＷフィルタとを縦続接続した
受信フィルタを備えた先に提案したアンテナ共用器を、
デュアルモードシステムで用いたときの耐干渉妨害性能
の向上を図り、小形化，軽量化し、かつ、製造コストの
低減を図ったアンテナ共用器を提供することにある。An object of the present invention is to provide a previously proposed antenna duplexer having a transmission filter and a reception filter in which a band-stop dielectric filter and a SAW filter are cascaded.
An object of the present invention is to provide an antenna duplexer which is improved in anti-interference performance when used in a dual-mode system, is reduced in size and weight, and is reduced in manufacturing cost.

【００１７】[0017]

【課題を解決するための手段】本発明の請求項１及び請
求項２記載のアンテナ共用器は、移動局の送信周波数帯
域が受信周波数帯域より低く設定された無線システムに
おける電波を送受信するアンテナと、該アンテナに接続
され受信側と送信側に分岐する分岐回路と、該分岐回路
の受信側に接続され受信周波数帯域信号を通過させ送信
周波数帯域を減衰域とする受信フィルタと、受信周波数
帯域を減衰域とし入力された送信周波数帯域信号を通過
させて前記分岐回路に入力する送信フィルタとを備えた
アンテナ共用器において、前記受信フィルタは、前記分
岐回路から出力される受信周波数帯域信号を通過させ送
信周波数帯域を減衰域とする帯域阻止形誘電体フィルタ
と、該誘電体フィルタに分岐接続され前記受信周波数帯
域を少なくとも２つに分割したそれぞれを通過域とする
少なくとも２つの帯域通過形弾性表面波フィルタとから
なり、前記帯域阻止形誘電体フィルタの出力端の分岐点
と接地との間に接続された誘導性リアクタンスと、該分
岐点と各弾性表面波フィルタの入力端との間にそれぞれ
直列接続された少なくとも２つの容量性リアクタンスと
によってそれぞれ高域通過形特性をもたせた整合回路が
備えられたことを特徴とするものである。また、前記少
なくとも２つの帯域通過形弾性表面波フィルタの出力の
いずれかを切替え出力する切替器を備えたことを特徴と
するものである。According to a first aspect of the present invention, there is provided an antenna duplexer for transmitting and receiving radio waves in a wireless system in which a transmission frequency band of a mobile station is set lower than a reception frequency band. A branch circuit that is connected to the antenna and branches to a reception side and a transmission side, a reception filter that is connected to the reception side of the branch circuit, passes a reception frequency band signal, and has a transmission frequency band as an attenuation band, and a reception frequency band. An antenna duplexer having a transmission filter that passes a transmission frequency band signal input as an attenuation band and inputs the signal to the branch circuit, wherein the reception filter passes a reception frequency band signal output from the branch circuit. A band rejection type dielectric filter having a transmission frequency band as an attenuation band, and at least two reception frequency bands branched and connected to the dielectric filter. And at least two band-pass surface acoustic wave filters each having a pass band divided into two, and an inductive reactance connected between a branch point at an output end of the band-stop type dielectric filter and ground, A matching circuit having high-pass characteristics by at least two capacitive reactances connected in series between the branch point and the input end of each surface acoustic wave filter, respectively. It is. Further, a switch is provided for switching and outputting any one of the outputs of the at least two band-pass surface acoustic wave filters.

【００１８】さらに、請求項３記載のアンテナ共用器
は、前記受信フィルタは、前記分岐回路から出力される
受信周波数帯域信号を通過させ送信周波数帯域を減衰域
とする帯域阻止形誘電体フィルタと、該誘電体フィルタ
に分岐接続され、前記受信周波数帯域を通過域とする第
１の帯域通過形弾性表面波フィルタと、前記受信周波数
帯域を少なくとも２つに分割したうちの１つを通過域と
する第２の帯域通過形弾性表面波フィルタとから構成さ
れたことを特徴とするものである。Further, in the antenna duplexer according to the present invention, the reception filter includes a band-stop type dielectric filter that passes a reception frequency band signal output from the branch circuit and uses a transmission frequency band as an attenuation band. A first band-pass surface acoustic wave filter that is branched and connected to the dielectric filter and has the reception frequency band as a pass band, and that one of the reception frequency bands divided into at least two is a pass band And a second band-pass surface acoustic wave filter.

【００１９】[0019]

【発明の実施の形態】即ち、本発明のアンテナ共用器
は、受信フィルタ３として、高電力の送信帯域信号を阻
止する帯域阻止特性を有する誘電体フィルタ４と、その
出力に分岐接続され、分割した受信帯域をそれぞれ通過
帯域幅とする複数の帯域通過形弾性表面波フィルタ５，
６とから構成することにより、デュアルモードシステム
に適用することができ、かつ、小形化，軽量化，高性能
化したアンテナ共用器である。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the antenna duplexer of the present invention, a dielectric filter 4 having a band rejection characteristic for rejecting a high-power transmission band signal is used as a reception filter 3, and the output of the dielectric filter 4 is divided and connected. A plurality of band-pass surface acoustic wave filters each having a pass band width of the received reception band,
6 is an antenna duplexer that can be applied to a dual mode system, and has a reduced size, lighter weight, and higher performance.

【００２０】図１は本発明の第１の実施例を示すブロッ
ク図であり、図２はその具体的構成例を示す回路図、図
３，図４はその減衰特性例図である。これらの図におい
て、１はアンテナ、２は分岐回路、３は受信フィルタ、
４は誘電体フィルタ、５，６は弾性表面波（ＳＡＷ）フ
ィルタ、７は送信フィルタ、８は誘電体フィルタ、９は
切替器、１０（１０−１〜１０−３）は整合回路、Ｒｘ
は受信帯域信号、Ｒｘ１，Ｒｘ２は例えば２つに分割さ
れた受信帯域信号、Ｔｘは送信帯域信号である。切替器
９はアンテナ共用器に含めて構成してもよいし、アンテ
ナ共用器の構成を２つの出力端子までとし、その２つの
出力端子から出力される、帯域を分割した受信信号を、
受信機で切替えるようにしてもよい。FIG. 1 is a block diagram showing a first embodiment of the present invention, FIG. 2 is a circuit diagram showing a specific configuration example, and FIGS. 3 and 4 are diagrams showing examples of attenuation characteristics. In these figures, 1 is an antenna, 2 is a branch circuit, 3 is a reception filter,
4 is a dielectric filter, 5 and 6 are surface acoustic wave (SAW) filters, 7 is a transmission filter, 8 is a dielectric filter, 9 is a switch, 10 (10-1 to 10-3) is a matching circuit, and Rx
Is a reception band signal, Rx1 and Rx2 are reception band signals divided into two, for example, and Tx is a transmission band signal. The switch 9 may be configured to be included in the antenna duplexer, or the configuration of the antenna duplexer may be configured up to two output terminals, and the divided signals received from the two output terminals may be output.
The switching may be performed by the receiver.

【００２１】この実施例は、図６に示した従来の構成に
対して受信フィルタが異なり、受信フィルタ３を、送信
帯域阻止形誘電体フィルタ４と、その誘電体フィルタ４
に分岐接続した２つのＳＡＷフィルタ５及び６によって
構成したものである。送信フィルタ７の誘電体フィルタ
８は図６の従来の送信フィルタ１３の誘電体フィルタ１
４と同じである。In this embodiment, the receiving filter differs from the conventional configuration shown in FIG. 6, and the receiving filter 3 is composed of a transmission band rejection type dielectric filter 4 and its dielectric filter 4.
This is constituted by two SAW filters 5 and 6 branched and connected. The dielectric filter 8 of the transmission filter 7 is the dielectric filter 1 of the conventional transmission filter 13 of FIG.
Same as 4.

【００２２】図３は、図１，図２の帯域通過形ＳＡＷフ
ィルタの特性例を示し、破線は従来の全受信帯域（Ｒ
ｘ）を通過帯域とするＳＡＷフィルタの特性例、実線
及び１点鎖線は、本発明により受信帯域をＲｘ１とＲ
ｘ２に２分割し、そのそれぞれを通過域とするＳＡＷフ
ィルタ５，６の特性例である。FIG. 3 shows an example of the characteristics of the band-pass SAW filter shown in FIGS. 1 and 2. A broken line indicates a conventional whole reception band (R
The characteristic example of the SAW filter having the pass band x), the solid line and the dashed line indicate the reception bands Rx1 and Rx1 according to the present invention.
This is a characteristic example of the SAW filters 5 and 6, which are divided into x2 and each of which is a pass band.

【００２３】図４（Ａ）は、図１，図２の送信フィルタ
７すなわち誘電体フィルタ８の減衰特性例図であり、送
信帯域信号（Ｔｘ）を通過させ受信帯域信号（Ｒｘ）を
阻止する受信帯域阻止特性を示す。図４の（Ｂ），
（Ｃ）は、図１，図２に示した本発明の第１の実施例に
よる受信フィルタ３の減衰特性例図である。破線で示し
た特性ａは、１個の共振器で構成した誘電体フィルタ４
の送信帯域阻止特性を示し、一点鎖線で示した特性ｂ，
ｄは、受信帯域（Ｒｘ）を２分割してそれぞれＲｘ１，
Ｒｘ２を通過させるＳＡＷフィルタ５，６の帯域通過
（ＢＰＦ）特性を示し、実線の特性ｃ，ｅは、誘電体フ
ィルタ４の入力からＳＡＷフィルタ５，６のそれぞれの
出力端子までの総合特性である。FIG. 4A is an example of an attenuation characteristic of the transmission filter 7, that is, the dielectric filter 8 of FIGS. 1 and 2, which transmits a transmission band signal (Tx) and blocks a reception band signal (Rx). 4 shows a reception band rejection characteristic. FIG. 4 (B),
FIG. 3C is an example of an attenuation characteristic of the reception filter 3 according to the first embodiment of the present invention shown in FIGS. 1 and 2. The characteristic a shown by the broken line is a dielectric filter 4 composed of one resonator.
, And the characteristic b,
d divides the reception band (Rx) into two, Rx1 and Rx1, respectively.
The graph shows band pass (BPF) characteristics of the SAW filters 5 and 6 that pass Rx2, and the solid line characteristics c and e are total characteristics from the input of the dielectric filter 4 to the respective output terminals of the SAW filters 5 and 6. .

【００２４】[0024]

【作用】アンテナ１に到来した電波は、分岐回路２を経
て受信フィルタ３に入力され、まず、帯域阻止形誘電体
フィルタ４で送信帯域信号（Ｔｘ）が阻止され、受信帯
域信号（Ｒｘ）が通過する。さらに、この誘電体フィル
タ４に分岐接続され、受信帯域を２分割したそれぞれを
通過させる帯域通過形ＳＡＷフィルタ５，６に入力され
る。ＳＡＷフィルタ５と６の出力Ｒｘ１とＲｘ２は切替
器９に入力され、制御信号によってそのいずれかが切替
え出力される。The radio wave arriving at the antenna 1 is input to the reception filter 3 through the branch circuit 2, and the transmission band signal (Tx) is first blocked by the band rejection type dielectric filter 4, and the reception band signal (Rx) is changed. pass. Further, it is branched and connected to the dielectric filter 4, and is input to band-pass SAW filters 5 and 6, which pass each of the divided reception bands into two. The outputs Rx1 and Rx2 of the SAW filters 5 and 6 are input to a switch 9, and one of them is switched and output by a control signal.

【００２５】例えば、ＳＡＷフィルタ５の受信帯域Ｒｘ
１の一方のシステムのチャネルで通話中に、他方のシス
テムの強電界領域に移動して他方のシステムの加入者が
受信帯域Ｒｘ２のチャネルで通話していても、ＳＡＷフ
ィルタ６の出力がオフになっているので、当方の通話が
妨げられることはない。切替器９は、基地局からの指定
に基づいて受信回路を制御する制御部からの制御信号に
よって、指定チャネルを通過させるＳＡＷフィルタの出
力を切替え出力する。For example, the reception band Rx of the SAW filter 5
1 While the telephone is being talked on the channel of one system, the output of the SAW filter 6 is turned off even if the subscriber of the other system is talking on the channel of the reception band Rx2 while moving to the strong electric field region of the other system. So your call will not be interrupted. The switch 9 switches and outputs the output of the SAW filter that passes the designated channel according to the control signal from the control unit that controls the receiving circuit based on the designation from the base station.

【００２６】この第１の実施例においては、特に、受信
フィルタ３を構成する誘電体フィルタ４と分岐接続され
た２つのＳＡＷフィルタ５，６の前後の位置関係が重要
であり、誘電体フィルタ４を前段に配置し、後段にＳＡ
Ｗフィルタ５，６を配置して縦続接続することにより、
送信フィルタ７から出力される高い電力レベルの送信信
号Ｔｘは直接ＳＡＷフィルタ５，６にに印加されない。
このようにして高い電力レベルの送信信号ＴｘがＳＡＷ
フィルタ５および６に印加されないのでフィルタ内で発
生する３次相互変調歪積の軽減が図られる。In the first embodiment, the positional relationship before and after the two SAW filters 5 and 6 branched and connected to the dielectric filter 4 constituting the reception filter 3 is particularly important. Is arranged at the front stage, and SA is arranged at the rear stage.
By arranging the W filters 5 and 6 in cascade,
The transmission signal Tx of a high power level output from the transmission filter 7 is not directly applied to the SAW filters 5 and 6.
In this way, the transmission signal Tx of the high power level
Since it is not applied to the filters 5 and 6, the product of the third-order intermodulation distortion generated in the filters can be reduced.

【００２７】図２に示した第１の実施例の回路例図にお
いて、受信フィルタ３を構成する誘電体フィルタ４と２
つのＳＡＷフィルタ５及び６とにより、受信帯域内の全
体を整合させるための入力側整合回路１０−１のインダ
クタンスＬ4 の構成法が重要であり、この構成により、
送信側回路に及ぼす送信帯域内のウェーブトラップまた
はノッチフィルタ作用による障害の除去を図っている。In the circuit diagram of the first embodiment shown in FIG. 2, the dielectric filters 4 and 2 constituting the reception filter 3 are shown.
One of the the SAW filter 5 and 6, the configuration method of the inductance L 4 of the input-side matching circuit 10-1 for matching the whole in the receive band is important, this arrangement,
A wave trap or a notch filter in a transmission band acting on a transmission side circuit is used to remove a disturbance.

【００２８】すなわち、本発明が対象としているシステ
ムの移動送信帯域Ｔｘは受信帯域Ｒｘより周波数が低い
ので、誘電体フィルタ４のインピーダンスが受信帯域で
誘導性となり、このインダクタンスＬ４の代わりにコン
デンサを接続すると受信帯域Ｒｘに並列共振回路が形成
され、その周波数の低い側の誘導性リアクタンスと分岐
回路のコンデンサＣ６とで送信帯域にウェーブトラップ
が形成される恐れがある。そこで、そのような障害が発
生しないようにインダクタンスＬ４を対接地間に配置し
た。That is, since the mobile transmission band Tx of the system targeted by the present invention has a lower frequency than the reception band Rx, the impedance of the dielectric filter 4 becomes inductive in the reception band, and a capacitor is connected instead of the inductance L4. Then, a parallel resonance circuit is formed in the reception band Rx, and a wave trap may be formed in the transmission band by the inductive reactance on the low frequency side and the capacitor C6 of the branch circuit. Therefore, the inductance L4 is arranged between the ground and the ground so that such a trouble does not occur.

【００２９】一般に、アンテナ共用器には、送受信の相
互の干渉を防ぐため、システムの所要値に従って互いに
他方の周波数帯域の減衰量を最も大きくする必要があ
る。図６で示した従来の誘電体フィルタの単独構成で
は、所要の減衰量を得るために構成段数を多く必要とし
たが、本発明によると、帯域外減衰量は比較的小さいが
通過帯域内挿入損失の比較的少ない弾性表面波フィルタ
と組合せて、阻止帯域の減衰を補うことによって誘電体
フィルタ４，８の共振素子の段数を著しく少なくするこ
とができる。In general, in order to prevent mutual interference between transmission and reception, the antenna duplexer needs to maximize the attenuation of the other frequency band in accordance with the required value of the system. Although the conventional dielectric filter shown in FIG. 6 requires a large number of stages in order to obtain a required amount of attenuation, according to the present invention, the amount of out-of-band attenuation is relatively small but the amount of insertion in the pass band is relatively small. By combining with a surface acoustic wave filter having a relatively small loss and supplementing the attenuation of the stop band, the number of resonance elements of the dielectric filters 4 and 8 can be significantly reduced.

【００３０】上述の本発明の第１の実施例では、受信帯
域を２分割し、そのそれぞれを通過させる２つのＳＡＷ
フィルタ５，６を誘電体フィルタ４の出力端に分岐接続
した構成を示したが、受信帯域を２以上の複数分割とし
てもよい。In the above-described first embodiment of the present invention, the reception band is divided into two,
Although the configuration is shown in which the filters 5 and 6 are branched and connected to the output end of the dielectric filter 4, the reception band may be divided into two or more.

【００３１】また、ディジタル・アナログ両方式の周波
数割当によっては、受信帯域の全幅を通過域とするＳＡ
Ｗフィルタと、受信帯域を２〜３分割した帯域のいずれ
か１つを通過させる分割帯域通過ＳＡＷフィルタとを誘
電体フィルタ４の出力に分岐接続し、切替器９でそのい
ずれかを切替えて、受信全帯域と一部帯域を選択して他
のシステムの干渉を軽減するように構成することもでき
る。Also, depending on the frequency assignment of both digital and analog systems, the SA having the entire width of the reception band as the pass band may be used.
A W filter and a split band pass SAW filter that passes any one of the bands obtained by dividing the reception band into two or three are branched and connected to the output of the dielectric filter 4, and one of them is switched by the switch 9, It is also possible to select the whole reception band and a part of the reception band to reduce interference of other systems.

【００３２】小形化の具体例として、図６の従来構成と
図２の本発明の第１の実施例の構成とを比較すると、誘
電体共振器の数が７個から４個に減り、極めて小型のＳ
ＡＷフィルタが２個実装されている。本発明のアンテナ
共用器は受信の周波数干渉耐力を強くし、かつ、その体
積は、例えば、１２８８mm3 から９５２mm3 になり、約
２６％減少した。As a specific example of miniaturization, comparing the conventional configuration shown in FIG. 6 with the configuration of the first embodiment of the present invention shown in FIG. 2, the number of dielectric resonators is reduced from seven to four. Small S
Two AW filters are mounted. The antenna duplexer of the present invention has enhanced frequency interference immunity of reception, and its volume has been reduced from, for example, 1288 mm 3 to 952 mm 3 , and has been reduced by about 26%.

【００３３】[0033]

【発明の効果】以上詳細に説明したように、本発明を実
施することにより、次の効果が得られる。 （１）デュアルモードの使用チャネルのフィルタを選択
運用できるので、他のシステムからの干渉妨害波に対し
て、従来のものより減衰を大きくとることができ、他の
システムからの干渉妨害による障害を軽減し、回避する
ことができる。 （２）従来のアンテナ共用器に比べて選択度が優れ、耐
周波数干渉性能が向上し、かつ、小形の共用器が実現で
きるため、無線機器の小形化，高性能化への寄与が大き
い。 （３）主要帯域内通過特性を支配する比較的狭帯域の弾
性表面波フィルタ２個により、構成段数の少ない帯域阻
止形誘電体フィルタと組み合わせた構造のため、構造が
単純で組立が容易であり、高性能化と製造コストの大幅
な低減を図ることができる。 （４）少ない段数の誘電体フィルタと、阻止域減衰量の
大きな値を必要としない超小型の弾性表面波フィルタに
より挿入損失の低減が図れるため、無線機器の低消費電
流化と耐受信干渉性能向上を同時に図ることができる。 （５）薄膜技術によるデバイスである弾性表面波フィル
タと組合せて、総合の誘電体素子の段数を低減できるこ
とから重量の軽減効果も著しく、無線機器、特にポケッ
ト形端末機の軽量化に大きく寄与することができる。 （６）システム所要性能によっては、送受信フィルタを
構成する誘電体フィルタ及び弾性表面波フィルタの段数
の一部または全部の削減も可能であることから、アンテ
ナ共用器の構成の柔軟性を助長し、開発作業の低減を図
ることができる。As described in detail above, the following effects can be obtained by implementing the present invention. (1) Since the filter of the channel used in the dual mode can be selectively operated, the attenuation of the interference wave from other systems can be made larger than that of the conventional system, and the interference due to the interference from other systems can be reduced. Can be reduced and avoided. (2) Compared to the conventional antenna duplexer, the selectivity is better, the frequency interference resistance is improved, and a small duplexer can be realized, which greatly contributes to the miniaturization and high performance of wireless devices. (3) The structure is simple and easy to assemble because the structure is combined with a band-stop type dielectric filter having a small number of stages by using two relatively narrow band surface acoustic wave filters that govern the main band pass characteristics. Thus, high performance and a significant reduction in manufacturing cost can be achieved. (4) Insertion loss can be reduced by a dielectric filter with a small number of stages and a super-small surface acoustic wave filter that does not require a large amount of stopband attenuation, so that current consumption of wireless devices is reduced and anti-reception performance is reduced. Improvement can be achieved at the same time. (5) In combination with a surface acoustic wave filter, which is a device based on thin film technology, the total number of dielectric elements can be reduced, so that the weight reduction effect is also remarkable, greatly contributing to the weight reduction of wireless devices, especially pocket type terminals. be able to. (6) Depending on the required performance of the system, part or all of the number of stages of the dielectric filter and the surface acoustic wave filter constituting the transmission / reception filter can be reduced, so that the flexibility of the configuration of the antenna duplexer is promoted. Development work can be reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の第１の実施例を示すブロック図であ
る。FIG. 1 is a block diagram showing a first embodiment of the present invention.

【図２】図１の実施例の具体的回路例図である。FIG. 2 is a specific circuit example of the embodiment of FIG.

【図３】第１の実施例のＳＡＷフィルタ特性例図であ
る。FIG. 3 is a graph showing an example of SAW filter characteristics according to the first embodiment;

【図４】第１の実施例のフィルタ特性例図である。FIG. 4 is a graph showing an example of filter characteristics according to the first embodiment;

【図５】従来のアンテナ共用器のブロック図である。FIG. 5 is a block diagram of a conventional antenna duplexer.

【図６】従来のアンテナ共用器の回路例図である。FIG. 6 is a circuit diagram of a conventional antenna duplexer.

【図７】従来のアンテナ共用器の特性例図である。FIG. 7 is a characteristic example diagram of a conventional antenna duplexer.

【符号の説明】[Explanation of symbols]

１ アンテナ ２ 分岐回路 ３，１１ 受信フィルタ ４ 帯域阻止誘電体フィルタ ５，６ 帯域通過ＳＡＷフィルタ ７，１３ 送信フィルタ ８ 帯域阻止誘電体フィルタ ９ 切替器 １０ 整合回路 １２，１４ 誘電体フィルタ REFERENCE SIGNS LIST 1 antenna 2 branch circuit 3, 11 reception filter 4 band-stop dielectric filter 5, 6 band-pass SAW filter 7, 13 transmission filter 8 band-stop dielectric filter 9 switch 10 matching circuit 12, 14 dielectric filter

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 移動局の送信周波数帯域が受信周波数帯
域より低く設定された無線システムにおける電波を送受
信するアンテナと、該アンテナに接続され受信側と送信
側に分岐する分岐回路と、該分岐回路の受信側に接続さ
れ受信周波数帯域信号を通過させ送信周波数帯域を減衰
域とする受信フィルタと、受信周波数帯域を減衰域とし
入力された送信周波数帯域信号を通過させて前記分岐回
路に入力する送信フィルタとを備えたアンテナ共用器に
おいて、 前記受信フィルタは、前記分岐回路から出力される受信
周波数帯域信号を通過させ送信周波数帯域を減衰域とす
る帯域阻止形誘電体フィルタと、該誘電体フィルタに分
岐接続され前記受信周波数帯域を少なくとも２つに分割
したそれぞれを通過域とする少なくとも２つの帯域通過
形弾性表面波フィルタとからなり、 前記帯域阻止形誘電体フィルタの出力端の分岐点と接地
との間に接続された誘導性リアクタンスと、該分岐点と
各弾性表面波フィルタの入力端との間にそれぞれ直列接
続された少なくとも２つの容量性リアクタンスとによっ
てそれぞれ高域通過形特性をもたせた整合回路が備えら
れたことを特徴とするアンテナ共用器。An antenna for transmitting and receiving radio waves in a wireless system in which a transmission frequency band of a mobile station is set lower than a reception frequency band, a branch circuit connected to the antenna and branching to a reception side and a transmission side, and the branch circuit A receiving filter connected to the receiving side and passing a receiving frequency band signal and using a transmitting frequency band as an attenuation band, and transmitting a receiving frequency band signal as an attenuation band and passing an input transmitting frequency band signal and inputting the signal to the branch circuit. An antenna duplexer including a filter, wherein the reception filter is a band-stop type dielectric filter that passes a reception frequency band signal output from the branch circuit and uses a transmission frequency band as an attenuation band; At least two band-pass elastic tables each having a passband, each of which is a branch connection and which divides the reception frequency band into at least two. An inductive reactance connected between a branch point at the output end of the band-stop type dielectric filter and the ground, and between the branch point and the input end of each surface acoustic wave filter. An antenna duplexer comprising a matching circuit having high-pass characteristics by at least two capacitive reactances connected in series. 【請求項２】 前記少なくとも２つの帯域通過形弾性表
面波フィルタの出力のいずれかを切替え出力する切替器
を備えたことを特徴とする請求項１記載のアンテナ共用
器。2. The antenna duplexer according to claim 1, further comprising a switch for switching and outputting one of the outputs of the at least two band-pass surface acoustic wave filters. 【請求項３】 請求項１記載の受信フィルタは、前記分
岐回路から出力される受信周波数帯域信号を通過させ送
信周波数帯域を減衰域とする帯域阻止形誘電体フィルタ
と、該誘電体フィルタに分岐接続され、前記受信周波数
帯域を通過域とする第１の帯域通過形弾性表面波フィル
タと、前記受信周波数帯域を少なくとも２つに分割した
うちの１つを通過域とする第２の帯域通過形弾性表面波
フィルタとから構成されたことを特徴とする請求項１記
載のアンテナ共用器。3. The bandpass type dielectric filter according to claim 1, wherein the bandpass type dielectric filter passes a reception frequency band signal output from said branching circuit and uses a transmission frequency band as an attenuation band, and branches to said dielectric filter. A first band-pass surface acoustic wave filter connected to the reception frequency band and having a pass band, and a second band-pass surface filter having at least one of the reception frequency bands divided into at least two pass bands. 2. The antenna duplexer according to claim 1, comprising a surface acoustic wave filter.
JP8212201A 1996-07-24 1996-07-24 Antenna duplexer Expired - Fee Related JP2901181B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8212201A JP2901181B2 (en) 1996-07-24 1996-07-24 Antenna duplexer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8212201A JP2901181B2 (en) 1996-07-24 1996-07-24 Antenna duplexer

Publications (2)

Publication Number Publication Date
JPH1041704A true JPH1041704A (en) 1998-02-13
JP2901181B2 JP2901181B2 (en) 1999-06-07

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ID=16618603

Family Applications (1)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000286609A (en) * 1999-03-31 2000-10-13 Kyocera Corp Antenna circuit
KR100327534B1 (en) * 1998-08-11 2002-03-14 무라타 야스타카 duplexer and communication apparatus
US6366765B1 (en) 1998-03-30 2002-04-02 Hitachi Kokusai Electric Inc. Receiver
EP1298756A2 (en) * 2001-10-01 2003-04-02 Matsushita Electric Industrial Co., Ltd. Composite filter, antenna duplexer, and communication apparatus
US6788958B2 (en) 2000-07-27 2004-09-07 Murata Manufacturing Co., Ltd. High-frequency module and mobile communication apparatus using the same
WO2010032389A1 (en) * 2008-09-18 2010-03-25 株式会社 村田製作所 Duplexer module
WO2012020595A1 (en) * 2010-08-11 2012-02-16 株式会社村田製作所 High frequency module and communication device
US8494008B2 (en) 2005-09-05 2013-07-23 National University Corporation The University Of Electro-Communications Multiplexing circuit and designing method therefor
WO2018070273A1 (en) * 2016-10-13 2018-04-19 株式会社村田製作所 Acoustic wave filter device

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6366765B1 (en) 1998-03-30 2002-04-02 Hitachi Kokusai Electric Inc. Receiver
KR100327534B1 (en) * 1998-08-11 2002-03-14 무라타 야스타카 duplexer and communication apparatus
JP2000286609A (en) * 1999-03-31 2000-10-13 Kyocera Corp Antenna circuit
US6788958B2 (en) 2000-07-27 2004-09-07 Murata Manufacturing Co., Ltd. High-frequency module and mobile communication apparatus using the same
US7398103B2 (en) 2000-07-27 2008-07-08 Murata Manufacturing Co., Ltd. High-frequency module and mobile communication apparatus using the same
EP1298756A2 (en) * 2001-10-01 2003-04-02 Matsushita Electric Industrial Co., Ltd. Composite filter, antenna duplexer, and communication apparatus
EP1298756A3 (en) * 2001-10-01 2004-01-02 Matsushita Electric Industrial Co., Ltd. Composite filter, antenna duplexer, and communication apparatus
US6809611B2 (en) 2001-10-01 2004-10-26 Matsushita Electric Industrial Co., Ltd. Composite filter, antenna duplexer, and communication apparatus
US8494008B2 (en) 2005-09-05 2013-07-23 National University Corporation The University Of Electro-Communications Multiplexing circuit and designing method therefor
JPWO2010032389A1 (en) * 2008-09-18 2012-02-02 株式会社村田製作所 Duplexer module
US8222969B2 (en) 2008-09-18 2012-07-17 Murata Manufacturing Co., Ltd. Duplexer module
WO2010032389A1 (en) * 2008-09-18 2010-03-25 株式会社 村田製作所 Duplexer module
WO2012020595A1 (en) * 2010-08-11 2012-02-16 株式会社村田製作所 High frequency module and communication device
JP5429384B2 (en) * 2010-08-11 2014-02-26 株式会社村田製作所 High frequency module and communication device
US9184782B2 (en) 2010-08-11 2015-11-10 Murata Manufacturing Co., Ltd. High-frequency module and communication device
WO2018070273A1 (en) * 2016-10-13 2018-04-19 株式会社村田製作所 Acoustic wave filter device
CN109845105A (en) * 2016-10-13 2019-06-04 株式会社村田制作所 Acoustic wave filter device
US10812043B2 (en) 2016-10-13 2020-10-20 Murata Manufacturing Co., Ltd. Acoustic wave filter device

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