JPH09232909A - Branch filter - Google Patents
Branch filterInfo
- Publication number
- JPH09232909A JPH09232909A JP8041195A JP4119596A JPH09232909A JP H09232909 A JPH09232909 A JP H09232909A JP 8041195 A JP8041195 A JP 8041195A JP 4119596 A JP4119596 A JP 4119596A JP H09232909 A JPH09232909 A JP H09232909A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- filter
- transmission
- duplexer
- reception
- 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.)
- Withdrawn
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- 230000005540 biological transmission Effects 0.000 claims abstract description 49
- 230000000593 degrading effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
Landscapes
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する分野】本発明は、アンテナと送信回路及
び受信回路間に介在され、送信信号及び受信信号をそれ
ぞれ所定の帯域に制限する分波器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplexer that is interposed between an antenna and a transmission circuit and a reception circuit to limit a transmission signal and a reception signal to predetermined bands.
【０００２】[0002]
【従来の技術】従来、このようや分野の技術としては、
例えば、以下に示すようなものがあった。 （１）特公平６−３０４３３号公報「弾性表面波フィル
タを用いた分波器」。 （２）特開平５−１７５８７９号公報「アンテナ共用
器」。2. Description of the Related Art Conventionally, in this field of technology,
For example, there are the following. (1) Japanese Examined Patent Publication No. 30433/1994, “Splitter using surface acoustic wave filter”. (2) JP-A-5-175879, "Antenna duplexer".
【０００３】（３）特開平５−９５２０４号公報「分波
器」。 （４）特公平７−６０９８４号公報「分波器」。 図６はかかる従来の携帯電話のアンテナと送信回路及び
受信回路に介在される分波器の回路構成を示す図であ
る。図６に示すように、分波器は送信用フィルタ（Ｔ
ｘ）１０６及び受信用フィルタ（Ｒｘ）１０７をバンド
パスフィルタ（ＢＰＦ）で構成したものである。なお、
Ｔｘ端１０１は送信回路からの送信信号を入力する入力
端、Ｒｘ端１０２は受信信号を受信回路に出力する出力
端、ＡＮＴ端１００は、前記送受信信号をアンテナに入
出力する入出力端である。(3) Japanese Unexamined Patent Publication No. 5-95204, "Demultiplexer". (4) Japanese Examined Patent Publication No. 7-60984 "Splitter". FIG. 6 is a diagram showing a circuit configuration of a demultiplexer interposed between an antenna, a transmitting circuit and a receiving circuit of such a conventional mobile phone. As shown in FIG. 6, the demultiplexer includes a transmission filter (T
x) 106 and the receiving filter (Rx) 107 are configured by a bandpass filter (BPF). In addition,
A Tx terminal 101 is an input terminal for inputting a transmission signal from a transmission circuit, an Rx terminal 102 is an output terminal for outputting a reception signal to a reception circuit, and an ANT terminal 100 is an input / output terminal for inputting / outputting the transmission / reception signal to / from an antenna. .
【０００４】この分波器に用いられるＴｘ及びＲｘとし
ては、筒状のセラミック等の内周面、外周面及び一方端
面を、導電材料で被覆した終端短絡の（１／４）λ波長
誘電体同軸共振器を用いた誘電体フィルタが用いられて
いる。なお、１０５は分波回路、１０８，１０９は（１
／４）λ波長伝送線路である。As Tx and Rx used in this demultiplexer, a terminal short-circuited (1/4) λ wavelength dielectric in which an inner peripheral surface, an outer peripheral surface and one end surface of a cylindrical ceramic or the like are coated with a conductive material is used. A dielectric filter using a coaxial resonator is used. In addition, 105 is a demultiplexing circuit, and 108 and 109 are (1
/ 4) A λ wavelength transmission line.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
た従来の分波器では、Ｔｘ１０６及びＲｘ１０７とし
て、前記終端短絡の（１／４）λ波長誘電体同軸共振器
を用いた誘電体フィルタを使用しているため、小形化が
困難となっている。すなわち、Ｔｘ１０６及びＲｘ１０
７を構成する誘電体同軸共振器のサイズを小さくする
と、Ｑが低下し、フィルタの挿入損失が増大するので、
所定のフィルタ特性を確保しつつ、小形化を図るには一
定の限界がある。However, in the above-mentioned conventional duplexer, the dielectric filter using the (1/4) λ wavelength dielectric coaxial resonator with the termination short circuit is used as Tx106 and Rx107. Therefore, miniaturization is difficult. That is, Tx106 and Rx10
When the size of the dielectric coaxial resonator constituting 7 is reduced, Q is lowered and the insertion loss of the filter is increased.
There is a certain limit to miniaturization while ensuring a predetermined filter characteristic.
【０００６】一方、分波器用のＴｘ、Ｒｘとしては、性
能及び形状からＳＡＷフィルタが最も適している。しか
し、分波器用のＴｘは高い耐電力性が要求される。ま
た、ＲｘはＴｘと同等レベルの高い耐入力電力性は要し
ないが、耐電力性が要求される。したがって、Ｒｘは耐
電力の小さい他のフィルタで構成することにより、分波
器の小形化を図ることが考えられる。しかし、Ｒｘを耐
電力の小さい他のフィルタで構成し、前記誘電体フィル
タからなるＴｘとを組み合わせた場合、Ｔｘから出力さ
れる大電力の送信信号が受信用フィルタに回り込み、Ｒ
ｘが破損するという問題が生じる場合がある。On the other hand, as the Tx and Rx for the duplexer, the SAW filter is most suitable in terms of performance and shape. However, Tx for the duplexer is required to have high power resistance. Further, Rx does not require high input power resistance equivalent to Tx, but power resistance is required. Therefore, it is possible to reduce the size of the duplexer by configuring Rx with another filter having low withstand power. However, when Rx is composed of another filter having low withstand power and combined with Tx composed of the dielectric filter, a high-power transmission signal output from Tx spills over to the reception filter, and Rx
There may be a problem that x is damaged.
【０００７】本発明は、上記問題点を除去し、その特性
や信頼性を劣化させることなく、小形化、軽量化及び低
コスト化を図り得る分波器を提供することを目的とす
る。It is an object of the present invention to eliminate the above problems and to provide a duplexer which can be made compact, lightweight and low in cost without deteriorating its characteristics and reliability.
【０００８】[0008]
【課題を解決するための手段】本発明は、上記目的を達
成するために、図１に示すように、アンテナと送信用回
路及び受信用回路間に介在され、送信信号、受信信号を
それぞれ所定の帯域に制限する分波器において、送信用
共振器形ＳＡＷフィルタ７の入出力端子は付加回路Ｔ２
１２，Ｔ１１１を接続した構成からなるＢＰＦのＴｘ４
を備えており、受信用共振器形ＳＡＷフィルタ８の入出
力端子は付加回路Ｒ１１３，Ｒ２１４を接続した構成か
らなるＢＰＦのＴｘ５を備えている。さらに、Ｔｘ４は
信号入力端に耐電力性能向上のためのトラップ回路１
５、Ｒｘ５は信号入力端に耐電力性能向上のためのトラ
ップ回路１６を備えている。In order to achieve the above object, the present invention is interposed between an antenna and a transmitting circuit and a receiving circuit as shown in FIG. In the demultiplexer that limits the band to the band, the input / output terminal of the transmitting resonator type SAW filter 7 is the additional circuit T2.
BPF Tx4 composed of 12 and T111 connected together
In addition, the input / output terminal of the receiving resonator type SAW filter 8 is provided with a BPF Tx5 having a configuration in which additional circuits R113 and R214 are connected. Further, Tx4 is a trap circuit 1 at the signal input end for improving power withstanding performance.
5 and Rx5 are equipped with a trap circuit 16 at the signal input end for improving the withstand power performance.
【０００９】この送信用及び受信用共振器形ＳＡＷフィ
ルタ７，８の入力端及び出力端の付加回路Ｔ２１２，Ｔ
１１１，Ｒ１１３，Ｒ２１４は、共振器形ＳＡＷフィル
タと外部回路の間の整合回路の役目もしている。また、
トラップ回路１５のトラップ周波数をＴｘ４の減衰帯域
に設定し、減衰特性の改善を図り、更に、Ｔｘ４の入力
端に置くことにより、Ｔｘ４の耐電力特性の向上が可能
となる。Additional circuits T212 and T at the input and output ends of the transmitting and receiving resonator type SAW filters 7 and 8, respectively.
111, R113 and R214 also serve as a matching circuit between the resonator type SAW filter and an external circuit. Also,
By setting the trap frequency of the trap circuit 15 in the attenuation band of Tx4 to improve the attenuation characteristic, and further by placing it at the input end of Tx4, the power withstand characteristic of Tx4 can be improved.
【００１０】Ｒｘ５は受信用共振器形ＳＡＷフィルタ８
の入力端の付加回路Ｒ１１３はトラップ回路１６を含む
構成となる。このＲｘ５のトラップ回路１６はＴｘ４の
トラップ回路１５と同様に、トラップ周波数をＲｘ５の
減衰帯域に設定し、減衰特性の改善を図り、更に、Ｒｘ
５の入力端に置くことにより、Ｒｘ５の耐電力特性の向
上が可能である。回路構成は並列共振回路を有するもの
が好ましい。好ましくは、前記Ｔｘ４の出力端とＲｘ５
の入力端間に（１／４）λ波長伝送線路からなる整合回
路を介在させるとよい。Rx5 is a receiving resonator type SAW filter 8
The additional circuit R113 at the input end of is configured to include the trap circuit 16. Like the trap circuit 15 of Tx4, the trap circuit 16 of Rx5 sets the trap frequency in the attenuation band of Rx5 to improve the attenuation characteristic.
By placing it at the input end of No. 5, it is possible to improve the power withstand characteristic of Rx5. The circuit configuration preferably has a parallel resonant circuit. Preferably, the output end of the Tx4 and the Rx5
It is advisable to interpose a matching circuit composed of a (1/4) λ wavelength transmission line between the input ends of.
【００１１】また、Ｔｘ４のＰ対回路（耐電力特性向上
用回路）１５は、送信信号による送信用共振器形ＳＡＷ
フィルタ７の破壊を防止し、更にこのＰ対回路１５をノ
ッチ回路で構成し、ノッチ周波数を減衰域に設定するこ
とにより、Ｔｘ４の減衰特性を改善する。このように、
アンテナと送信用回路及び受信用回路間に介在され、送
信信号、受信信号をそれぞれ所定の帯域に制限する分波
器において、共振器形ＳＡＷフィルタと付加回路からな
るＢＰＦの送信用フィルタ及び受信フィルタで構成する
ことにより、分波器が小さくなる。The Tx4 P-pair circuit (circuit for improving withstand power characteristics) 15 is a resonator type SAW for transmission by a transmission signal.
The attenuation characteristic of Tx4 is improved by preventing the filter 7 from being destroyed and by configuring the P-pair circuit 15 with a notch circuit and setting the notch frequency in the attenuation region. in this way,
A BPF transmission filter and reception filter including a resonator SAW filter and an additional circuit in a duplexer that is interposed between an antenna and a transmission circuit and a reception circuit to limit a transmission signal and a reception signal to predetermined bands, respectively. With this configuration, the duplexer becomes smaller.
【００１２】また、Ｔｘ４及びＲｘ５の入力端にトラッ
プ回路を挿入することにより、両フィルタの耐電力性能
が改善され、Ｔｘ４にも共振器形ＳＡＷフィルタと付加
回路からなるＢＰＦのＴｘ４の使用が可能である。Ｒｘ
５の入力端にトラップ回路１６を挿入することにより、
分波回路６による送信用フィルタの特性劣化が少なくな
る。By inserting a trap circuit at the input ends of Tx4 and Rx5, the power withstand performance of both filters is improved, and Tx4 of the BPF composed of a resonator type SAW filter and an additional circuit can be used for Tx4. Is. Rx
By inserting the trap circuit 16 at the input end of 5,
The characteristic deterioration of the transmission filter due to the demultiplexing circuit 6 is reduced.
【００１３】このようにＴｘ４及びＲｘ５の入力端にト
ラップ回路を挿入することにより、両フィルタの減衰域
における減衰特性が改善され、移動機の性能が向上す
る。By thus inserting the trap circuit at the input ends of Tx4 and Rx5, the attenuation characteristics in the attenuation region of both filters are improved and the performance of the mobile device is improved.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施の形態につい
て図面を参照しながら詳細に説明する。図１は本発明の
分波器の基本回路構成を示す図である。この図におい
て、Ｔｘ端２は送信信号が入力される入力端子、Ｒｘ端
３は受信信号が出力される出力端子、ＡＮＴ端１は送信
信号及び受信信号が入出力される入出力共用端子であ
る。入力端子Ｔｘ端２は送信用回路に、出力端子ＲＸ端
３は受信用回路に接続され、入出力共用端子ＡＮＴ端１
はアンテナに接続される。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a basic circuit configuration of a duplexer of the present invention. In this figure, Tx terminal 2 is an input terminal for inputting a transmission signal, Rx terminal 3 is an output terminal for outputting a reception signal, and ANT terminal 1 is an input / output common terminal for inputting / outputting a transmission signal and a reception signal. . The input terminal Tx terminal 2 is connected to the transmitting circuit, the output terminal RX terminal 3 is connected to the receiving circuit, and the input / output common terminal ANT terminal 1 is connected.
Is connected to the antenna.
【００１５】また、４は入力端子Ｔｘ端２から入力され
た送信信号の帯域を所定の帯域に制限する送信用フィル
タ（Ｔｘ）で、５はアンテナで受信された受信信号を所
定の帯域に制限する受信用フィルタ（Ｒｘ）であり、周
知の共振器形ＳＡＷフィルタからなるＢＰＦで構成され
ている。９，１０は（１／４）λ波長伝送線路であり、
送信用フィルタ４及び受信用フィルタ５により分波器を
構成するための分波回路である。Reference numeral 4 denotes a transmission filter (Tx) for limiting the band of the transmission signal input from the input terminal Tx terminal 2 to a predetermined band, and 5 for limiting the reception signal received by the antenna to a predetermined band. The receiving filter (Rx) is a BPF including a well-known resonator type SAW filter. 9 and 10 are (1/4) λ wavelength transmission lines,
It is a demultiplexing circuit for forming a demultiplexer by the transmission filter 4 and the reception filter 5.
【００１６】送信用フィルタ（Ｔｘ）４の付加回路Ｔ１
１１は、送信用共振器形ＳＡＷフィルタ７とＡＮＴ端１
の間のインピーダンス整合のための回路で、この付加回
路Ｔ１１１の回路構成及び素子値により分波回路の特性
が決まる。送信用フィルタ４の付加回路Ｔ２１２は送信
用共振器形ＳＡＷフィルタ７とＴｘ端２の間のインピー
ダンス整合のための動作とＰ対回路１５のノッチ周波数
及びその減衰量に関係する。Additional circuit T1 of transmission filter (Tx) 4
11 is a resonator type SAW filter 7 for transmission and an ANT end 1
In the circuit for impedance matching, the characteristics of the demultiplexing circuit are determined by the circuit configuration and element value of the additional circuit T111. The additional circuit T212 of the transmitting filter 4 is related to the operation for impedance matching between the transmitting resonator type SAW filter 7 and the Tx terminal 2, the notch frequency of the P pair circuit 15 and its attenuation amount.
【００１７】また、受信用フィルタ５の付加回路Ｒ１１
３は、受信用共振器形ＳＡＷフィルタ８とインピーダン
ス整合の動作と、Ｐ対回路１６のノッチ周波数及びその
減衰量に関係し、更に、この付加回路の回路構成及び素
子値により分波回路の特性が決まる。受信用フィルタ５
の付加回路Ｒ２１４は受信用共振器形ＳＡＷフィルタ８
とＲｘ端３間のインピーダンス整合のための動作をす
る。The additional circuit R11 of the receiving filter 5 is also provided.
3 relates to the operation of impedance matching with the receiving resonator type SAW filter 8, the notch frequency of the P-pair circuit 16 and its attenuation amount, and further the characteristics of the demultiplexing circuit depending on the circuit configuration and element value of this additional circuit. Is decided. Reception filter 5
The additional circuit R214 of is a receiving resonator type SAW filter 8
And Rx terminal 3 for impedance matching.
【００１８】図２は本発明の分波器の回路構成１を示す
図である。この回路構成１においては、受信用フィルタ
５に接続される（１／４）λ波長伝送線路１０を、集中
定数素子１６０（ＬPR1 ）、１６１（ＣPR1 ）、２００
（ＣR11 ）、２０１（ＬR12 ）により置換した回路であ
る。また、図１におけるＰ対回路１５を、並列共振回路
１５０（ＬPT1 ）、１５１（ＣPT1 ）に置換したもので
ある。２２０は容量ＣT21 である。更に、図１における
付加回路Ｒ２１４を、インダクタ２０２（ＬR21 ) 、容
量２０３（ＣR22 ）に置換したものである。FIG. 2 is a diagram showing a circuit configuration 1 of the duplexer of the present invention. In this circuit configuration 1, the (¼) λ wavelength transmission line 10 connected to the reception filter 5 is connected to the lumped constant elements 160 (L PR1 ), 161 (C PR1 ), 200
(C R11 ) and 201 (L R12 ) are replaced. Further, the P-pair circuit 15 in FIG. 1 is replaced with parallel resonant circuits 150 (L PT1 ) and 151 (C PT1 ). 220 is the capacity C T21 . Further, the additional circuit R214 in FIG. 1 is replaced with an inductor 202 (L R21 ) and a capacitor 203 (C R22 ).
【００１９】このように構成することにより、受信用フ
ィルタ５のＰ対回路１６は受信信号による受信用共振器
形ＳＡＷフィルタ８の破壊を防止すると同時に、受信用
フィルタ５の減衰特性を改善し、更に、分波回路として
も動作し、送信用フィルタ４の挿入損失を改善すること
ができる。図３は本発明の分波器の回路構成２を示す図
である。With this configuration, the P-pair circuit 16 of the receiving filter 5 prevents the receiving resonator SAW filter 8 from being destroyed by the received signal and at the same time improves the attenuation characteristic of the receiving filter 5. Further, it also operates as a demultiplexing circuit, and the insertion loss of the transmission filter 4 can be improved. FIG. 3 is a diagram showing a circuit configuration 2 of the duplexer of the present invention.
【００２０】この回路構成２では、送信用フィルタ４に
接続される（１／４）λ波長伝送線路９を、集中定数素
子２１０（ＬT11 ），２１１（ＬT12 ），２１２（Ｃ
T11 ）により置換し、受信用フィルタ５に接続される
（１／４）λ波長伝送線路１０を、集中定数素子１６０
（ＬPR1 ），１６１（ＣPR1 ），２００（ＣR11 ），２
０１（ＬR12 ）により置換した回路である。In this circuit structure 2, the (1/4) λ wavelength transmission line 9 connected to the transmission filter 4 is connected to the lumped constant elements 210 (L T11 ), 211 (L T12 ), 212 (C).
T11 ) to replace the (1/4) λ wavelength transmission line 10 connected to the receiving filter 5 with the lumped element 160
(L PR1 ), 161 (C PR1 ), 200 (C R11 ), 2
The circuit is replaced by 01 (L R12 ).
【００２１】更に、送信用フィルタ４のＰ対回路１５
を、並列共振回路１５０（ＬPT1 ），１５１
（ＣPT1 ），２２０（ＣT21 ）に、そして、受信フィル
タ５の付加回路Ｒ２１４を、インダクタ２０２
（ＬR21 ），容量２０３（ＣR22 ）に置換したものであ
る。この場合、（１／４）λ波長伝送線路は、集中定数
素子により置換した回路で伝送ロスが低減され、更に、
小形化が可能となる。Further, the P pair circuit 15 of the transmitting filter 4
In parallel resonance circuit 150 (L PT1 ), 151
(C PT1 ), 220 (C T21 ), and the additional circuit R214 of the reception filter 5 is connected to the inductor 202.
(L R21 ) and the capacitance 203 (C R22 ) are replaced. In this case, in the (1/4) λ wavelength transmission line, the transmission loss is reduced by the circuit replaced by the lumped constant element, and further,
Miniaturization is possible.
【００２２】また、図１において、送信用フィルタ４の
Ｐ対回路１５は送信信号による送信用共振器形ＳＡＷフ
ィルタ７の破壊を防止し、更に、このＰ対回路１５をノ
ッチ回路で構成し、ノッチ周波数を減衰域に設定するこ
とにより、送信フィルタ４の減衰特性を改善する。図２
及び図３はこの回路を並列共振回路１５０（ＬPT1 ），
１５１（ＣPT1 ）により構成したものである。Further, in FIG. 1, the P pair circuit 15 of the transmission filter 4 prevents the transmission resonator type SAW filter 7 from being broken by the transmission signal, and further, the P pair circuit 15 is formed by a notch circuit, By setting the notch frequency in the attenuation range, the attenuation characteristic of the transmission filter 4 is improved. FIG.
And FIG. 3 shows this circuit as a parallel resonant circuit 150 (L PT1 ),
151 (C PT1 ).
【００２３】上記したように、受信用フィルタ５のＰ対
回路１６は受信信号による受信用共振器形ＳＡＷフィル
タ８の破壊を防止すると同時に送信用フィルタ５の減衰
特性を改善し、更に、分岐回路としても動作し、送信用
フィルタ４の挿入損失を改善する。図２及び図３は、こ
の回路を並列共振回路１６０（ＬPR1 ），１６１（Ｃ
PR1 ）により構成したものである。As described above, the P pair of the receiving filter 5
The circuit 16 is a resonator type SAW filter for receiving by a received signal.
The destruction of the transmitter 8 is prevented and at the same time the transmission filter 5 is attenuated.
Improves characteristics and also operates as a branch circuit for transmission
The insertion loss of the filter 4 is improved. 2 and 3 are
The parallel resonance circuit 160 (LPR1), 161 (C
PR1) Is configured by.
【００２４】この実施例では、Ｐ対回路１５，１６とし
て並列共振回路を用いたが、図４に示すように、２つの
（１／４）λ波長伝送線路７００，７０１により、直列
共振回路１５２（ＬS ），１５３（ＣS ）を挟むことに
よっても実現可能である。いずれにせよ、等価並列共振
特性の等価Ｑ値が大きい回路構成を採用すればよい。図
５は本発明の分波器の回路構成３を示す図である。In this embodiment, parallel resonant circuits are used as the P pair circuits 15 and 16, but as shown in FIG. 4, the series resonant circuit 152 is constituted by two (1/4) λ wavelength transmission lines 700 and 701. It can also be realized by sandwiching (L S ) and 153 (C S ). In any case, a circuit configuration in which the equivalent Q value of the equivalent parallel resonance characteristic is large may be adopted. FIG. 5 is a diagram showing a circuit configuration 3 of the duplexer of the present invention.
【００２５】この回路構成３においては、図１における
Ｐ対回路１５を、並列共振回路１５０（ＬPT1 ），１５
１（ＣPT1 ）に置換し、更に、図１における付加回路Ｒ
２１４を、インダクタ２０２（ＬR21 ），容量２０３
（ＣR22 ）に置換したものである。なお、本発明は上記
実施例に限定されるものではなく、本発明の趣旨に基づ
いて種々の変形が可能であり、これらを本発明の範囲か
ら排除するものではない。In this circuit configuration 3, the P pair circuit 15 in FIG. 1 is replaced by the parallel resonant circuits 150 (L PT1 ), 15
1 (C PT1 ) and further the additional circuit R in FIG.
214 is an inductor 202 (L R21 ) and a capacitor 203
(C R22 ). It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made based on the gist of the present invention, and these are not excluded from the scope of the present invention.
【００２６】[0026]
【発明の効果】以上、詳細に説明したように、本発明に
よれば、以下のような効果を奏することができる。本発
明によれば、送信用フィルタ、受信用フィルタともに共
振器形ＳＡＷフィルタにより分波器を構成したもので、
分波器の特性の高性能化と同時に小形化、軽量化を図る
ことができる。As described above, according to the present invention, the following effects can be obtained. According to the present invention, both the transmitting filter and the receiving filter constitute the duplexer by the resonator type SAW filter.
It is possible to reduce the size and weight of the duplexer while improving its performance.
【００２７】また、送信用フィルタ及び受信用フィルタ
の入力端にＰ対回路を設定したことにより、送信用フィ
ルタ及び受信用フィルタの耐電力性能の向上と減衰特性
の改善を図ることができ、受信用フィルタの入力端のＰ
対回路は分波回路としても動作し、特に送信用フィルタ
の挿入損特性の改善に寄与する。Further, by setting the P-pair circuit at the input ends of the transmitting filter and the receiving filter, it is possible to improve the power withstanding performance and the attenuation characteristic of the transmitting filter and the receiving filter, At the input end of the filter for
The pair circuit also operates as a demultiplexing circuit, and particularly contributes to the improvement of the insertion loss characteristic of the transmission filter.
【図１】本発明の分波器の基本回路構成を示す図であ
る。FIG. 1 is a diagram showing a basic circuit configuration of a duplexer of the present invention.
【図２】本発明の分波器の回路構成１を示す図である。FIG. 2 is a diagram showing a circuit configuration 1 of the duplexer of the present invention.
【図３】本発明の分波器の回路構成２を示す図である。FIG. 3 is a diagram showing a circuit configuration 2 of the duplexer of the present invention.
【図４】本発明の分波器のＰ対回路の他の実施例を示す
図である。FIG. 4 is a diagram showing another embodiment of the P-pair circuit of the duplexer of the present invention.
【図５】本発明の分波器の回路構成３を示す図である。FIG. 5 is a diagram showing a circuit configuration 3 of the duplexer of the present invention.
【図６】従来の携帯電話のアンテナと送信回路及び受信
回路に介在される分波器の回路構成を示す図である。FIG. 6 is a diagram showing a circuit configuration of a duplexer interposed between a conventional mobile phone antenna, a transmission circuit, and a reception circuit.
１ ＡＮＴ端（入出力共用端子） ２ Ｔｘ端（入力端子） ３ Ｒｘ端（出力端子） ４ 送信用フィルタ（Ｔｘ） ５ 受信用フィルタ（Ｒｘ） ６ 分波回路 ７ 送信用共振器形ＳＡＷフィルタ ８ 受信用共振器形ＳＡＷフィルタ ９，１０ （１／４）λ波長伝送線路 １５，１６ Ｐ対回路 １５０，１５１ 並列共振回路 １６０，１６１，２００，２０１，２１０，２１１，２
１２ 集中定数素子 Ｔ１１１，Ｔ２１２，Ｒ１１３，Ｒ２１４ 付加回路1 ANT end (input / output shared terminal) 2 Tx end (input terminal) 3 Rx end (output terminal) 4 Transmission filter (Tx) 5 Reception filter (Rx) 6 Demultiplexing circuit 7 Transmission resonator type SAW filter 8 Resonator type SAW filter 9,10 (1/4) λ wavelength transmission line 15,16 P pair circuit 150,151 Parallel resonant circuit 160,161,200,201,210,211,2
12 Lumped element T111, T212, R113, R214 Additional circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 駒崎 友和 東京都港区虎ノ門１丁目７番12号 沖電気 工業株式会社内 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Tomokazu Komazaki 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.
Claims (5)
波回路を有する分波器において、 前記送信用フィルタ及び受信用フィルタを、共振器形Ｓ
ＡＷフィルタと、該共振器形ＳＡＷフィルタの入力端及
び出力端にそれぞれ接続される付加回路とから構成する
ことを特徴とする分波器。1. A demultiplexer having a transmission filter, a reception filter, and a demultiplexing circuit, wherein the transmission filter and the reception filter are a resonator type S.
A duplexer comprising an AW filter and additional circuits respectively connected to an input end and an output end of the resonator type SAW filter.
信用フィルタ及び受信用フィルタの信号入力端に耐電力
特性向上用回路を設けたことを特徴とする分波器。2. The duplexer according to claim 1, wherein a circuit for improving power withstanding characteristics is provided at signal input terminals of the transmitting filter and the receiving filter.
電力特性向上用回路をトラップ回路としたことを特徴と
する分波器。3. The duplexer according to claim 2, wherein the circuit for improving withstand power characteristics is a trap circuit.
ラップ回路を（１／４）λ波長伝送線路、直列共振回路
及び（１／４）λ波長伝送線路としたことを特徴とする
分波器。4. The duplexer according to claim 3, wherein the trap circuit is a (1/4) λ wavelength transmission line, a series resonant circuit, and a (1/4) λ wavelength transmission line. Wave instrument.
信用フィルタの信号入力端に耐電力特性向上用回路及び
分波回路特性向上用回路を設けたことを特徴とする分波
器。5. The duplexer according to claim 1, wherein a signal withstanding signal characteristic improving circuit and a branching circuit characteristic improving circuit are provided at a signal input end of the receiving filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8041195A JPH09232909A (en) | 1996-02-28 | 1996-02-28 | Branch filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8041195A JPH09232909A (en) | 1996-02-28 | 1996-02-28 | Branch filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09232909A true JPH09232909A (en) | 1997-09-05 |
Family
ID=12601649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8041195A Withdrawn JPH09232909A (en) | 1996-02-28 | 1996-02-28 | Branch filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09232909A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000151456A (en) * | 1998-11-05 | 2000-05-30 | Oki Electric Ind Co Ltd | Surface acoustic wave branching device of transmission band split type |
| US6489861B2 (en) | 2000-04-28 | 2002-12-03 | Oki Electric Industry Co., Ltd. | Antenna duplexer with divided and grounded transmission line |
| JP2003209487A (en) * | 2001-12-13 | 2003-07-25 | Agilent Technol Inc | Filtering method using a duplexer with differential reception port |
| KR100485735B1 (en) * | 2001-10-19 | 2005-04-28 | 가부시키가이샤 무라타 세이사쿠쇼 | Branching filter and communication apparatus |
| US7725082B2 (en) | 2002-12-18 | 2010-05-25 | Panasonic Corp. | Radio communication apparatus, radio communication method, antenna apparatus and first duplexer |
| JP2012501563A (en) * | 2008-09-01 | 2012-01-19 | エプコス アクチエンゲゼルシャフト | Antenna matching circuit |
| JP2015029238A (en) * | 2013-07-31 | 2015-02-12 | 株式会社村田製作所 | Duplexer |
-
1996
- 1996-02-28 JP JP8041195A patent/JPH09232909A/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000151456A (en) * | 1998-11-05 | 2000-05-30 | Oki Electric Ind Co Ltd | Surface acoustic wave branching device of transmission band split type |
| US6489861B2 (en) | 2000-04-28 | 2002-12-03 | Oki Electric Industry Co., Ltd. | Antenna duplexer with divided and grounded transmission line |
| KR100485735B1 (en) * | 2001-10-19 | 2005-04-28 | 가부시키가이샤 무라타 세이사쿠쇼 | Branching filter and communication apparatus |
| JP2003209487A (en) * | 2001-12-13 | 2003-07-25 | Agilent Technol Inc | Filtering method using a duplexer with differential reception port |
| US7725082B2 (en) | 2002-12-18 | 2010-05-25 | Panasonic Corp. | Radio communication apparatus, radio communication method, antenna apparatus and first duplexer |
| JP2012501563A (en) * | 2008-09-01 | 2012-01-19 | エプコス アクチエンゲゼルシャフト | Antenna matching circuit |
| US9160306B2 (en) | 2008-09-01 | 2015-10-13 | Epcos Ag | Duplexer and method for increasing the isolation between two filters |
| US9214920B2 (en) | 2008-09-01 | 2015-12-15 | Epcos Ag | Antenna matching circuit |
| US9577606B2 (en) | 2008-09-01 | 2017-02-21 | Epcos Ag | Duplexer and method for increasing the isolation between two filters |
| JP2015029238A (en) * | 2013-07-31 | 2015-02-12 | 株式会社村田製作所 | Duplexer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030506 |