JP2007189747A - Branching filter employing surface acoustic wave filter - Google Patents

Branching filter employing surface acoustic wave filter Download PDF

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JP2007189747A
JP2007189747A JP2007106075A JP2007106075A JP2007189747A JP 2007189747 A JP2007189747 A JP 2007189747A JP 2007106075 A JP2007106075 A JP 2007106075A JP 2007106075 A JP2007106075 A JP 2007106075A JP 2007189747 A JP2007189747 A JP 2007189747A
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acoustic wave
surface acoustic
wave resonator
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Kazushige Noguchi
和繁 野口
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Oki Electric Industry Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact branching filter employing a surface acoustic wave filter capable of improving power resistance. <P>SOLUTION: The SAW branching filter has a transmission filter and a reception filter having different pass-bands. In the filter, the reception filter consists of a surface acoustic wave resonator, the transmission filter consists of a longitudinally coupled dual mode filter 105, a first surface acoustic wave resonator 103 is provided in series, and a second surface acoustic wave resonator 104 is provided in parallel on an output side of the transmission filter. One end of the first surface acoustic wave resonator is connected to an output terminal of the transmission filter, and one end of the second surface acoustic wave resonator is connected to the one end of the first surface acoustic wave resonator. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、移動体通信用機器、特に携帯電話等の無線部に用いられる弾性表面波フィルタを用いた分波器に関するものである。   The present invention relates to a duplexer using a surface acoustic wave filter used in a mobile communication device, particularly a wireless unit such as a mobile phone.

従来、このような分野の技術としては、例えば、特開平１０−２５６８６９号公報『分波器における送信用ＳＡＷフィルタの構造』（下記特許文献１参照）に開示されるものがあった。 Conventionally, as a technique in such a field, for example, there is one disclosed in Japanese Patent Laid-Open No. 10-256869 “Structure of a SAW filter for transmission in a duplexer” (see Patent Document 1 below) .

図１０は従来の弾性表面波フィルタを用いた分波器の構成図である。   FIG. 10 is a configuration diagram of a duplexer using a conventional surface acoustic wave filter.

この図に示すように、ＡＮＴ端１、接地ＧA ２、Ｔｘ（送信）端３、接地ＧT ４、Ｒｘ（受信）端５、接地ＧR ６、アンテナ側整合回路７、送信側分波回路８、送信側ＳＡＷ共振器型フィルタ９、送信側整合回路１０、受信側分波回路１１、受信側ＳＡＷ共振器型フィルタ１２、受信側整合回路１３で構成され、小型で通過帯域の挿入損失が小さいこと、お互いの通過帯域に対する減衰が大きいこと等の特性が要求されている。 As shown in this figure, the ANT end 1, the ground G A 2, the Tx (transmission) end 3, the ground G T 4, the Rx (reception) end 5, the ground G R 6, the antenna side matching circuit 7, the transmission side demultiplexing A circuit 8, a transmission-side SAW resonator type filter 9, a transmission-side matching circuit 10, a reception-side branching circuit 11, a reception-side SAW resonator-type filter 12, and a reception-side matching circuit 13. The characteristics such as being small and large attenuation with respect to each other pass band are required.

図１１は一般の弾性表面波共振器を用いた分波器を含むＲＦ部の構成図である。   FIG. 11 is a configuration diagram of an RF unit including a duplexer using a general surface acoustic wave resonator.

この図において、１４はアンテナ、１５は分波器、１６はアンプ、１７は受信側ＳＡＷフィルタ、１８はパワーアンプ、１９は送信側ＳＡＷフィルタである。   In this figure, 14 is an antenna, 15 is a duplexer, 16 is an amplifier, 17 is a reception side SAW filter, 18 is a power amplifier, and 19 is a transmission side SAW filter.

図１２は従来の弾性表面波共振器を用いた梯子型の６段構成の受信用フィルタの構成図である。   FIG. 12 is a block diagram of a ladder-type 6-stage receiving filter using a conventional surface acoustic wave resonator.

この図において、２１は受信用フィルタの入力端子、２２はこの受信用フィルタの出力端子、２３は入力端子２１に接続される第１の弾性表面波共振器、２４は入力端子２１に接続されるとともに、その出力端子が接地される第２の弾性表面波共振器、２５は第１の弾性表面波共振器２３の出力端子に接続されるとともに、その出力端子が接地される第３の弾性表面波共振器、２６は第１の弾性表面波共振器２３の出力端子に直列に接続される第４の弾性表面波共振器、２７は第４の弾性表面波共振器２６の出力端子に接続されるとともに、その出力端子が接地される第５の弾性表面波共振器、２８は第４の弾性表面波共振器２６の出力端子に直列に接続され、その出力がこの受信用フィルタの出力端子２２に接続される第６の弾性表面波共振器、２９は第６の弾性表面波共振器２８の出力端子に接続されるとともに、その出力端子が接地される第７の弾性表面波共振器である。
特開平１０−２５６８６９号公報 In this figure, 21 is an input terminal of the receiving filter, 22 is an output terminal of the receiving filter, 23 is a first surface acoustic wave resonator connected to the input terminal 21, and 24 is connected to the input terminal 21. The second surface acoustic wave resonator whose output terminal is grounded, and 25 is connected to the output terminal of the first surface acoustic wave resonator 23, and the third surface acoustic wave whose output terminal is grounded The wave resonator 26 is connected in series to the output terminal of the first surface acoustic wave resonator 23, and the fourth surface acoustic wave resonator 27 is connected to the output terminal of the fourth surface acoustic wave resonator 26. The fifth surface acoustic wave resonator 28, whose output terminal is grounded, is connected in series to the output terminal of the fourth surface acoustic wave resonator 26, and its output is the output terminal 22 of this receiving filter. The sixth surface acoustic wave connected to the Vessel, 29 is connected to the output terminal of the sixth surface acoustic wave resonator 28, a seventh surface acoustic wave resonator to which the output terminal is grounded.
Japanese Patent Laid-Open No. 10-256869

現在まで、分波器の部品用途は携帯電話端末用に用いられる誘電体フィルタと、カード端末用に用いられるＳＡＷ分波器といったように、大きく２種類に分けられていた。しかしながら、近年の携帯電話の普及と共に装置自体の小型化が消費者のニーズであり、自ずと装置内の高周波部品にも小型化の波が押し寄せてきている。その為、携帯電話端末用にも誘電体フィルタに代わってＳＡＷ分波器が使用されるようになってきた。   Until now, the parts of the duplexer have been roughly divided into two types, such as a dielectric filter used for a cellular phone terminal and a SAW duplexer used for a card terminal. However, with the spread of mobile phones in recent years, the miniaturization of the device itself is a consumer's need, and the wave of miniaturization is rushing to the high frequency components in the device. For this reason, SAW duplexers have been used instead of dielectric filters for mobile phone terminals.

上記のようなこともあって、ＳＡＷ分波器に対する装置要求規格が誘電体フィルタと同等規格となる一方、その携帯電話への利用に対しては、かつ、カード端末への利用より耐電力特性が重要視される携帯電話端末の規格を満足することは厳しく、特に受信フィルタの近傍減衰量（送信フィルタ側の通過帯域）を確保するために、上記した図１２に示す弾性表面波共振器を用いた梯子型回路構成でそれを実現することはチップサイズも大きくなる原因となり、難があった。   Due to the above, the device requirement standard for the SAW duplexer is equivalent to that of the dielectric filter. On the other hand, it is more resistant to power than the card terminal. In order to ensure the attenuation near the receiving filter (pass band on the transmission filter side), the surface acoustic wave resonator shown in FIG. Realizing this with the ladder-type circuit configuration used has caused difficulties in increasing the chip size.

また、縦結合二重モードフィルタを用いた回路構成は、受信フィルタの近傍減衰量（送信フィルタ側の通過帯域）を確保することは容易であるが、耐電力に弱いので、そのままＳＡＷ分波器で利用するには問題があった。   In addition, the circuit configuration using the longitudinally coupled double mode filter can easily secure the attenuation near the reception filter (pass band on the transmission filter side), but is weak in withstand power, so the SAW duplexer is used as it is. There was a problem with using it.

本発明は、上記問題点を除去し、コンパクトで、しかも耐電力を向上させることができる弾性表面波フィルタを用いた分波器を提供することを目的とする。   An object of the present invention is to provide a duplexer using a surface acoustic wave filter that eliminates the above-described problems, is compact, and can improve power durability.

本発明は、上記目的を達成するために、
〔１〕通過帯域の異なる送信用フィルタ及び受信用フィルタを有するＳＡＷ分波器において、前記受信用フィルタは弾性表面波共振器で構成し、前記送信用フィルタを縦結合二重モードフィルタで構成し、前記送信用フィルタの出力側には直列に第１の弾性表面波共振器が、並列に第２の弾性表面波共振器が設けられ、前記第１の弾性表面波共振器の一端は前記送信用フィルタの出力端子と接続されており、前記第２の弾性表面波共振器の一端は前記第１の弾性表面波共振器の前記一端に接続されているようにしたものである。 In order to achieve the above object, the present invention provides
[ 1 ] In a SAW duplexer having a transmission filter and a reception filter having different pass bands, the reception filter is constituted by a surface acoustic wave resonator, and the transmission filter is constituted by a longitudinally coupled double mode filter. In addition, a first surface acoustic wave resonator is provided in series on the output side of the transmission filter, and a second surface acoustic wave resonator is provided in parallel, and one end of the first surface acoustic wave resonator is provided at the transmission side. The second surface acoustic wave resonator is connected to an output terminal of a credit filter, and one end of the second surface acoustic wave resonator is connected to the one end of the first surface acoustic wave resonator.

〔２〕上記〔１〕記載の分波器において、前記送信用フィルタの入力側には、直列に第３の弾性表面波共振器が、並列に第４の弾性表面波共振器が設けられているようにしたものである。 [2] In the duplexer of the above [1] Symbol mounting, the input side of the transmission filter, the third surface acoustic wave resonator in series, the fourth surface acoustic wave resonator is provided in parallel It is what you have done.

〔３〕上記〔２〕記載の分波器において、前記第３の弾性表面波共振器の一端は前記送信用フィルタの入力端子と接続されており、前記第４の弾性表面波共振器の一端は前記第３の弾性表面波共振器の前記一端に接続されるているようにしたものである。 [ 3 ] The duplexer according to [ 2 ], wherein one end of the third surface acoustic wave resonator is connected to an input terminal of the transmission filter, and one end of the fourth surface acoustic wave resonator. Is connected to the one end of the third surface acoustic wave resonator.

〔４〕上記〔２〕記載の分波器において、前記第３の弾性表面波共振器の一端は前記送信用フィルタの入力端子と接続されており、前記第４の弾性表面波共振器の一端は前記第３の弾性表面波共振器の他端に接続されているようにしたものである。 [ 4 ] The duplexer according to [ 2 ], wherein one end of the third surface acoustic wave resonator is connected to an input terminal of the transmission filter, and one end of the fourth surface acoustic wave resonator is provided. Is connected to the other end of the third surface acoustic wave resonator.

〔５〕通過帯域の異なる送信用フィルタ及び受信用フィルタを有するＳＡＷ分波器において、前記送信用フィルタは弾性表面波共振器で構成し、前記受信用フィルタを縦結合二重モードフィルタで構成し、前記受信用フィルタの入力側には直列に第１の弾性表面波共振器が、並列に第２の弾性表面波共振器が設けられ、前記第１の弾性表面波共振器の一端は前記受信用フィルタの入力端子と接続されており、前記第２の弾性表面波共振器の一端は前記第１の弾性表面波共振器の前記一端に接続され、前記受信用フィルタの出力側には直列に第３の弾性表面波共振器が、並列に第４の弾性表面波共振器が設けられ、かつ前記第３の弾性表面波共振器の一端は前記受信用フィルタの出力端子と接続されており、前記第４の弾性表面波共振器の一端は前記第３の弾性表面波共振器の前記一端に接続されているようにしたものである。 [ 5 ] In a SAW duplexer having a transmission filter and a reception filter having different passbands, the transmission filter is constituted by a surface acoustic wave resonator, and the reception filter is constituted by a longitudinally coupled double mode filter. In addition, a first surface acoustic wave resonator is provided in series on the input side of the reception filter, and a second surface acoustic wave resonator is provided in parallel, and one end of the first surface acoustic wave resonator is provided at the reception side. Is connected to the input terminal of the filter, and one end of the second surface acoustic wave resonator is connected to the one end of the first surface acoustic wave resonator, and in series with the output side of the reception filter. A third surface acoustic wave resonator is provided in parallel with a fourth surface acoustic wave resonator, and one end of the third surface acoustic wave resonator is connected to an output terminal of the reception filter; One of the fourth surface acoustic wave resonators Are those as being connected to said one end of said third surface acoustic wave resonator.

本発明によれば、次のような効果を奏することができる。   According to the present invention, the following effects can be achieved.

（Ａ）ＲＦ部の回路構成にあるように、アンテナから見て分波器の次に送信系に接続されているＰＡ（パワーアンプ）からかなりの電力がかかるため、分波器の中のフィルタに耐電力に強い弾性表面波共振器を梯子型に１セクション配することにより、耐電力の向上を図ることができる。   (A) As shown in the circuit configuration of the RF unit, a considerable amount of power is applied from a PA (power amplifier) connected to the transmission system next to the duplexer when viewed from the antenna. In addition, by disposing one section of a surface acoustic wave resonator having a high power resistance in a ladder shape, the power resistance can be improved.

（Ｂ）弾性表面波チップの大きさが、従来の弾性表面波共振器を用いた梯子型の６段構成に比べ、受信フィルタの近傍（送信フィルタ側の通過帯域）における減衰量を改善することができる。なおかつ、弾性表面波共振器を梯子型に１セクション配置し、次段以降は縦結合二重モードフィルタを２段従属接続したパターン配置としたので、パターン設計に自由度が増し、チップサイズも小さくなり、製造コストも抑えることができる。   (B) The size of the surface acoustic wave chip improves the attenuation in the vicinity of the reception filter (pass band on the transmission filter side) compared to a ladder-type six-stage configuration using a conventional surface acoustic wave resonator. Can do. In addition, since the surface acoustic wave resonator is arranged in one section in a ladder shape, and the subsequent stage and subsequent longitudinally coupled double mode filters are arranged in two stages, the degree of freedom in pattern design is increased and the chip size is reduced. Thus, the manufacturing cost can be reduced.

（Ｃ）送信用フィルタを縦結合二重モードフィルタで構成する場合には、高調波特性の向上を図ることができる。   (C) When the transmission filter is constituted by a longitudinally coupled double mode filter, the harmonic characteristics can be improved.

本発明の分波器は、通過帯域の異なる送信用フィルタ及び受信用フィルタを有するＳＡＷ分波器において、前記受信用フィルタは弾性表面波共振器で構成し、前記送信用フィルタを縦結合二重モードフィルタで構成し、前記送信用フィルタの出力側には直列に第１の弾性表面波共振器が、並列に第２の弾性表面波共振器が設けられ、前記第１の弾性表面波共振器の一端は前記送信用フィルタの出力端子と接続されており、前記第２の弾性表面波共振器の一端は前記第１の弾性表面波共振器の前記一端に接続される。The duplexer according to the present invention is a SAW duplexer having a transmission filter and a reception filter having different passbands, wherein the reception filter is formed of a surface acoustic wave resonator, and the transmission filter is vertically coupled double. A first surface acoustic wave resonator is provided in series on the output side of the transmission filter, and a second surface acoustic wave resonator is provided in parallel on the output side of the transmission filter, and the first surface acoustic wave resonator is provided. Is connected to the output terminal of the transmission filter, and one end of the second surface acoustic wave resonator is connected to the one end of the first surface acoustic wave resonator.

以下、本発明の実施の形態について詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail.

図１は本発明の第１実施例を示す並列に弾性表面波共振器と、直列に弾性表面波共振器を１つずつと、縦結合二重モードフィルタを組み合わせた受信用フィルタを示す図である。   FIG. 1 is a diagram showing a receiving filter combining a surface acoustic wave resonator in parallel, one surface acoustic wave resonator in series, and a longitudinally coupled double mode filter according to the first embodiment of the present invention. is there.

この図において、１０１はこの受信用フィルタの入力端子、１０２はこの受信用フィルタの出力端子、１０３は入力端子１０１に接続されるとともに、その出力端子が接地される第１の弾性表面波共振器、１０４は入力端子１０１に直列に接続される第２の弾性表面波共振器、１０５は第２の弾性表面波共振器１０４の出力端子に接続される縦結合二重モードフィルタである。   In this figure, 101 is an input terminal of this receiving filter, 102 is an output terminal of this receiving filter, 103 is connected to the input terminal 101, and the first surface acoustic wave resonator whose output terminal is grounded , 104 is a second surface acoustic wave resonator connected in series to the input terminal 101, and 105 is a longitudinally coupled double mode filter connected to the output terminal of the second surface acoustic wave resonator 104.

このように、第１実施例によれば、図１０に示した弾性表面波フィルタを用いた分波器の構成の受信系において、従来は受信用フィルタを弾性表面波共振器で構成していたが、近傍減衰量（送信フィルタ側の通過帯域）規格の改善及び、高調波を十分確保するために、本実施例では縦結合二重モードフィルタ構造とし、受信用フィルタの前段に、図１に示すように、並列に第１の弾性表面波共振器１０３と、直列に第２の弾性表面波共振器１０４を１つずつ配置する。   As described above, according to the first embodiment, in the reception system having the duplexer configuration using the surface acoustic wave filter shown in FIG. 10, the reception filter is conventionally configured by the surface acoustic wave resonator. However, in order to improve the neighborhood attenuation (pass band on the transmission filter side) standard and to ensure sufficient harmonics, in this embodiment, a longitudinally coupled double-mode filter structure is used. As shown, a first surface acoustic wave resonator 103 is arranged in parallel and a second surface acoustic wave resonator 104 is arranged in series one by one.

図２は本発明の第２実施例を示す直列に第１の弾性表面波共振器と、並列に第２の弾性表面波共振器を１つずつと縦結合二重モードフィルタを組み合わせた受信用フィルタを示す図である。   FIG. 2 shows a second embodiment of the present invention for receiving a combination of a first surface acoustic wave resonator in series, a second surface acoustic wave resonator in parallel and a longitudinally coupled double mode filter. It is a figure which shows a filter.

この図において、２０１はこの受信用フィルタの入力端子、２０２はこの受信用フィルタの出力端子、２０３は入力端子２０１に直列に接続される第１の弾性表面波共振器、２０４は第１の弾性表面波共振器２０３の出力端子に接続されるとともに、その出力端子が接地される第２の弾性表面波共振器、２０５は第１の弾性表面波共振器２０３の出力端子に接続される縦結合二重モードフィルタである。   In this figure, 201 is an input terminal of this reception filter, 202 is an output terminal of this reception filter, 203 is a first surface acoustic wave resonator connected in series to the input terminal 201, and 204 is a first elasticity. A second surface acoustic wave resonator that is connected to the output terminal of the surface acoustic wave resonator 203 and whose output terminal is grounded, and 205 is a longitudinal coupling that is connected to the output terminal of the first surface acoustic wave resonator 203. It is a dual mode filter.

このように、第２実施例によれば、図１０に示した弾性表面波フィルタを用いた分波器の構成の受信系において、受信用フィルタを従来は弾性表面波共振器で構成していたが、近傍減衰量（送信フィルタ側の通過帯域）規格の改善及び、高調波を十分確保するために、縦結合二重モードフィルタ構造とし、受信用フィルタの前段に、図２に示したように、直列に弾性表面波共振器２０３と、並列に第２の弾性表面波共振器２０４を１つずつ配置する。   As described above, according to the second embodiment, in the reception system having the configuration of the duplexer using the surface acoustic wave filter shown in FIG. 10, the reception filter is conventionally constituted by the surface acoustic wave resonator. However, in order to improve the nearby attenuation (pass band on the transmission filter side) standard and to ensure sufficient harmonics, a longitudinally coupled double mode filter structure is used, and as shown in FIG. The surface acoustic wave resonator 203 is arranged in series and the second surface acoustic wave resonator 204 is arranged in parallel.

図３は本発明の第３実施例を示す直列に弾性表面波共振器１つと、縦結合二重モードフィルタを組み合わせた受信用フィルタを示す図である。   FIG. 3 is a diagram showing a receiving filter in which one surface acoustic wave resonator and a longitudinally coupled double mode filter are combined in series according to a third embodiment of the present invention.

この図において、３０１はこの受信用フィルタの入力端子、３０２はこの受信用フィルタの出力端子、３０３は入力端子３０１に直列に接続される弾性表面波共振器、３０４は弾性表面波共振器３０３の出力端子に接続される縦結合二重モードフィルタである。   In this figure, 301 is an input terminal of this receiving filter, 302 is an output terminal of this receiving filter, 303 is a surface acoustic wave resonator connected in series to the input terminal 301, and 304 is a surface acoustic wave resonator 303. It is a longitudinally coupled double mode filter connected to the output terminal.

このように、第３実施例によれば、図１０に示した弾性表面波フィルタを用いた分波器の構成の受信系において、受信用フィルタを従来は弾性表面波共振器で構成していたが、近傍減衰量（送信フィルタ側の通過帯域）規格の改善及び、高調波を十分確保するために、縦結合二重モードフィルタ構造とし、受信用フィルタの前段に、図３に示すように、直列に弾性表面波共振器３０３を１つ配置する。   As described above, according to the third embodiment, in the reception system having the duplexer configuration using the surface acoustic wave filter shown in FIG. 10, the reception filter is conventionally formed of a surface acoustic wave resonator. However, in order to improve the neighborhood attenuation (pass band on the transmission filter side) standard and sufficiently secure harmonics, a longitudinally coupled double mode filter structure is used, and as shown in FIG. One surface acoustic wave resonator 303 is arranged in series.

以下、本発明の動作について説明する。   The operation of the present invention will be described below.

一般に分波器を含めた無線（ＲＦ）部の回路構成は、前述した図１１に示すようになっている。ここで、ＲＦ部の信号の流れは受信系に関しては、アンテナ１４で受けた電波を分波器１５で分波させ、受信系側のアンプ１６で増幅し、受信側ＳＡＷフィルタ１７へ至り、次の部品（図示なし）へと信号が流れていく。   In general, the circuit configuration of a radio (RF) unit including a duplexer is as shown in FIG. Here, regarding the signal flow of the RF unit, with respect to the reception system, the radio wave received by the antenna 14 is demultiplexed by the demultiplexer 15, amplified by the amplifier 16 on the reception system side, and reaches the reception side SAW filter 17. The signal flows to the part (not shown).

送信系に関しては、部品（図示なし）から送信側ＳＡＷフィルタ１９へと信号が流れ、パワーアンプ１８で増幅され、分波器１５を介してアンテナ１４から電波が発信されていく。   As for the transmission system, a signal flows from a component (not shown) to the transmission-side SAW filter 19, amplified by the power amplifier 18, and radio waves are transmitted from the antenna 14 via the duplexer 15.

上記したように、分波器１５には、アンテナ１４からみて分波器１５の次に送信系に接続されているＰＡ（パワーアンプ）１８から、かなりの電力がかかる。そのため、分波器１５の中の送信フィルタは勿論のこと、一部受信フィルタにも回り込みが発生する。そこで、本発明では、ＲＦ部の回路構成にあるように、アンテナ１４から見て分波器１５の次に送信系に接続されているＰＡ（パワーアンプ）１８からかなりの電力がかかるため、分波器の中の送信フィルタ出力段に耐電力に強い弾性表面波共振器を梯子型に１セクション配し、入力段側は縦結合二重モードフィルタを縦属接続する。   As described above, considerable power is applied to the duplexer 15 from the PA (power amplifier) 18 connected to the transmission system next to the duplexer 15 as viewed from the antenna 14. For this reason, not only the transmission filter in the duplexer 15 but also a part of the reception filter sneak around. Therefore, in the present invention, as shown in the circuit configuration of the RF unit, considerable power is applied from a PA (power amplifier) 18 connected to the transmission system next to the duplexer 15 when viewed from the antenna 14. One section of a ladder-type surface acoustic wave resonator with high power resistance is arranged at the output stage of the transmission filter in the wave filter, and a longitudinally coupled double-mode filter is cascade-connected on the input stage side.

このように構成したので、この実施例によれば、弾性表面波チップの大きさが従来の図１２に示した弾性表面波共振器を用いた梯子型の６段構成に比べ、受信フィルタの近傍（送信フィルタ側の通過帯域）における減衰量を改善することができ、なおかつ弾性表面波共振器を梯子型に１セクション配し、次段以降は縦結合二重モードフィルタを２段従属接続したパターン配置であるので、パターン設計に自由度が増し、チップサイズも小さくなり製造コストも抑えることができる。   With this configuration, according to this embodiment, the size of the surface acoustic wave chip is closer to the reception filter than the conventional ladder type six-stage configuration using the surface acoustic wave resonator shown in FIG. A pattern in which the attenuation in the (pass band on the transmission filter side) can be improved, and a surface acoustic wave resonator is arranged in one section in a ladder shape, and two or more longitudinally coupled double mode filters are cascade connected in the subsequent stages Since it is an arrangement, the degree of freedom in pattern design is increased, the chip size is reduced, and the manufacturing cost can be reduced.

更に、以下のような実施例を展開することができる。   Further, the following embodiments can be developed.

図４は本発明の第４実施例を示す縦結合二重モードフィルタ２段と直列に弾性表面波共振器と、並列に弾性表面波共振器を１つずつを組み合わせた送信用フィルタを示す図である。   FIG. 4 is a diagram showing a transmission filter in which a surface acoustic wave resonator is combined in series with two stages of longitudinally coupled double mode filters according to a fourth embodiment of the present invention, and one surface acoustic wave resonator is combined in parallel. It is.

この図に示すように、この実施例の送信用フィルタは、送信用フィルタの入力端子４０１、送信用フィルタの出力端子４０２、入力端子４０１に直列に接続される２段の縦結合二重モードフィルタ４０３、その２段の縦結合二重モードフィルタ４０３の出力端子に直列に接続される弾性表面波共振器４０４と、その弾性表面波共振器４０４の出力端子に並列に接続される弾性表面波共振器４０５から構成されている。   As shown in this figure, the transmission filter of this embodiment is an input terminal 401 of the transmission filter, an output terminal 402 of the transmission filter, and a two-stage vertically coupled double mode filter connected in series to the input terminal 401. 403, a surface acoustic wave resonator 404 connected in series to the output terminal of the two-stage longitudinally coupled double mode filter 403, and a surface acoustic wave resonance connected in parallel to the output terminal of the surface acoustic wave resonator 404 The unit 405 is configured.

図５は本発明の第５実施例を示す縦結合二重モードフィルタ２段と並列に弾性表面波共振器と、直列に弾性表面波共振器を１つずつを組み合わせた送信用フィルタを示す図である。   FIG. 5 is a diagram showing a transmission filter in which surface acoustic wave resonators are combined in parallel with two stages of longitudinally coupled double mode filters according to a fifth embodiment of the present invention, and surface acoustic wave resonators are combined in series. It is.

この図に示すように、この実施例の送信用フィルタは、送信用フィルタの入力端子５０１、送信用フィルタの出力端子５０２、入力端子５０１に直列に接続される２段の縦結合二重モードフィルタ５０３、その２段の縦結合二重モードフィルタ５０３の出力端子に並列に接続される弾性表面波共振器５０４、その２段の縦結合二重モードフィルタ５０３の出力端子に直列に接続される弾性表面波共振器５０５から構成されている。   As shown in this figure, the transmission filter of this embodiment is an input terminal 501 of a transmission filter, an output terminal 502 of the transmission filter, and a two-stage vertically coupled double mode filter connected in series to the input terminal 501. 503, a surface acoustic wave resonator 504 connected in parallel to the output terminal of the two-stage longitudinally coupled double-mode filter 503, and an elasticity connected in series to the output terminal of the two-stage longitudinally-coupled dual-mode filter 503 The surface wave resonator 505 is configured.

図６は本発明の第６実施例を示す並列に弾性表面波共振器と、直列に弾性表面波共振器を１つずつと縦結合二重モードフィルタ１段と直列に弾性表面波共振器と、並列に弾性表面波共振器を組み合わせた送信及び受信用フィルタを示す図である。   FIG. 6 shows a sixth embodiment of the present invention, a surface acoustic wave resonator in parallel, a surface acoustic wave resonator in series and a surface acoustic wave resonator in series with one stage of a longitudinally coupled double mode filter. It is a figure which shows the filter for transmission and reception which combined the surface acoustic wave resonator in parallel.

この図に示すように、この実施例の送信及び受信用フィルタは、送信及び受信用フィルタの入力端子６０１、送信及び受信用フィルタの出力端子６０２、入力端子６０１に並列に接続される弾性表面波共振器６０３、入力端子６０１に直列に接続される弾性表面波共振器６０４、弾性表面波共振器６０４の出力端子に接続される１段の縦結合二重モードフィルタ６０５、その１段の縦結合二重モードフィルタ６０５の出力端子に直列に接続される弾性表面波共振器６０６、弾性表面波共振器６０６の出力端子に並列に接続される弾性表面波共振器６０７から構成されている。   As shown in this figure, the transmission and reception filters of this embodiment are a surface acoustic wave connected in parallel to an input terminal 601 of a transmission and reception filter, an output terminal 602 of a transmission and reception filter, and an input terminal 601. Resonator 603, surface acoustic wave resonator 604 connected in series to input terminal 601, one-stage longitudinally coupled double mode filter 605 connected to the output terminal of surface acoustic wave resonator 604, and one stage of longitudinal coupling The surface acoustic wave resonator 606 is connected in series to the output terminal of the dual mode filter 605, and the surface acoustic wave resonator 607 is connected in parallel to the output terminal of the surface acoustic wave resonator 606.

図７は本発明の第７実施例を示す並列に弾性表面波共振器と、直列に弾性表面波共振器を１つずつと縦結合二重モードフィルタ１段と並列に弾性表面波共振器と、直列に弾性表面波共振器を組み合わせた送信及び受信用フィルタを示す図である。   FIG. 7 shows a surface acoustic wave resonator in parallel according to a seventh embodiment of the present invention, a surface acoustic wave resonator in series and a surface acoustic wave resonator in parallel with one longitudinally coupled double mode filter. FIG. 3 is a diagram showing a transmission and reception filter in which surface acoustic wave resonators are combined in series.

この図に示すように、この実施例の送信及び受信用フィルタは、送信及び受信用フィルタの入力端子７０１、送信及び受信用フィルタの出力端子７０２、入力端子７０１に直列に接続される弾性表面波共振器７０４、並列に接続される弾性表面波共振器７０３、弾性表面波共振器７０４の出力端子に接続される１段の縦結合二重モードフィルタ７０５、その１段の縦結合二重モードフィルタ７０５の出力端子に並列に接続される弾性表面波共振器７０６、その１段の縦結合二重モードフィルタ７０５の出力端子に直列に接続される弾性表面波共振器７０７から構成している。   As shown in this figure, the transmission and reception filters of this embodiment include a transmission and reception filter input terminal 701, a transmission and reception filter output terminal 702, and a surface acoustic wave connected in series to the input terminal 701. Resonator 704, surface acoustic wave resonator 703 connected in parallel, one-stage longitudinally coupled double-mode filter 705 connected to the output terminal of surface acoustic wave resonator 704, and one-stage longitudinally coupled double-mode filter The surface acoustic wave resonator 706 connected in parallel to the output terminal 705 and the surface acoustic wave resonator 707 connected in series to the output terminal of the one-stage longitudinally coupled double mode filter 705.

図８は本発明の第８実施例を示す直列に弾性表面波共振器と、並列に弾性表面波共振器を１つずつと縦結合二重モードフィルタ１段と並列に弾性表面波共振器と、直列に弾性表面波共振器を組み合わせた送信及び受信用フィルタを示す図である。   FIG. 8 shows an eighth embodiment of the present invention. A surface acoustic wave resonator is connected in series, a surface acoustic wave resonator is connected in parallel, and a surface acoustic wave resonator is connected in parallel with one stage of a longitudinally coupled double mode filter. FIG. 3 is a diagram showing a transmission and reception filter in which surface acoustic wave resonators are combined in series.

この図に示すように、この実施例の送信及び受信用フィルタは、送信及び受信用フィルタの入力端子８０１、送信及び受信用フィルタの出力端子８０２、入力端子８０１に直列に接続される弾性表面波共振器８０３、その弾性表面波共振器８０３の出力端子に並列に接続される弾性表面波共振器８０４、弾性表面波共振器８０３の出力端子に直列に接続される１段の縦結合二重モードフィルタ８０５、その１段の縦結合二重モードフィルタ８０５の出力端子に並列に接続される弾性表面波共振器８０６、その１段の縦結合二重モードフィルタ８０５の出力端子に直列に接続される弾性表面波共振器８０７から構成されている。   As shown in this figure, the transmission and reception filters of this embodiment are an input terminal 801 of a transmission and reception filter, an output terminal 802 of a transmission and reception filter, and a surface acoustic wave connected in series to the input terminal 801. Resonator 803, surface acoustic wave resonator 804 connected in parallel to the output terminal of surface acoustic wave resonator 803, and one-stage longitudinally coupled double mode connected in series to the output terminal of surface acoustic wave resonator 803 The filter 805, the surface acoustic wave resonator 806 connected in parallel to the output terminal of the one-stage longitudinally coupled double mode filter 805, and connected in series to the output terminal of the one stage longitudinally coupled double mode filter 805 The surface acoustic wave resonator 807 is constituted.

図９は本発明の第９実施例を示す直列に弾性表面波共振器と、並列に弾性表面波共振器を１つずつと縦結合二重モードフィルタ１段と直列に弾性表面波共振器と、並列に弾性表面波共振器を組み合わせた送信及び受信用フィルタを示す図である。   FIG. 9 shows a surface acoustic wave resonator in series according to a ninth embodiment of the present invention, a surface acoustic wave resonator in parallel and a surface acoustic wave resonator in series with one stage of a longitudinally coupled double mode filter. It is a figure which shows the filter for transmission and reception which combined the surface acoustic wave resonator in parallel.

この図に示すように、この実施例の送信及び受信用フィルタは、送信及び受信用フィルタの入力端子９０１、送信及び受信用フィルタの出力端子９０２、入力端子９０１に直列に接続される弾性表面波共振器９０３、その弾性表面波共振器９０３の出力端子に並列に接続される弾性表面波共振器９０４、その弾性表面波共振器９０３の出力端子に直列に接続される１段の縦結合二重モードフィルタ９０５、その１段の縦結合二重モードフィルタ９０５の出力端子に直列に接続される弾性表面波共振器９０６、その弾性表面波共振器９０６に並列に接続される弾性表面波共振器９０７から構成されている。   As shown in this figure, the transmission and reception filters of this embodiment include a transmission and reception filter input terminal 901, a transmission and reception filter output terminal 902, and a surface acoustic wave connected in series to the input terminal 901. Resonator 903, surface acoustic wave resonator 904 connected in parallel to the output terminal of surface acoustic wave resonator 903, and one-stage vertically coupled double connected in series to the output terminal of surface acoustic wave resonator 903 A mode filter 905, a surface acoustic wave resonator 906 connected in series to the output terminal of the one-stage longitudinally coupled double mode filter 905, and a surface acoustic wave resonator 907 connected in parallel to the surface acoustic wave resonator 906 It is composed of

なお、図６〜図９に関しては受信側における構成を適宜送信側に適用できることは言うまでもない。   6 to 9, it goes without saying that the configuration on the reception side can be applied to the transmission side as appropriate.

また、送信側と受信側との複合構造にすることができることも言うまでもない。   Needless to say, the transmission side and the reception side can be combined.

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き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 addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

本発明の分波器は、コンパクトで、しかも耐電力を向上させることができる弾性表面波フィルタとして利用可能である。The duplexer of the present invention is compact and can be used as a surface acoustic wave filter that can improve power durability.

本発明の第１実施例を示す並列に弾性表面波共振器と直列に弾性表面波共振器を１つずつと縦結合二重モードフィルタを組み合わせた受信用フィルタを示す図である。It is a figure which shows the filter for reception which combined the surface acoustic wave resonator in parallel with the surface acoustic wave resonator in parallel which shows 1st Example of this invention, and the longitudinal coupling double mode filter one by one. 本発明の第２実施例を示す直列に第１の弾性表面波共振器と並列に第２の弾性表面波共振器を１つずつと縦結合二重モードフィルタを組み合わせた受信用フィルタを示す図である。The figure which shows the filter for reception which combined the 1st surface acoustic wave resonator in series with the 1st surface acoustic wave resonator in series and the 1st surface acoustic wave resonator in parallel and the longitudinally coupled double mode filter which shows 2nd Example of this invention. It is. 本発明の第３実施例を示す直列に弾性表面波共振器１つと縦結合二重モードフィルタを組み合わせた受信用フィルタを示す図である。It is a figure which shows the filter for reception which combined the surface acoustic wave resonator and longitudinally coupled double mode filter in series which shows 3rd Example of this invention. 本発明の第４実施例を示す縦結合二重モードフィルタ２段と直列に弾性表面波共振器と、並列に弾性表面波共振器を１つずつを組み合わせた送信用フィルタを示す図である。It is a figure which shows the filter for transmission which combined the surface acoustic wave resonator in series with 2 steps | paragraphs of the longitudinally coupled double mode filter which shows 4th Example of this invention, and the surface acoustic wave resonator in parallel one by one. 本発明の第５実施例を示す縦結合二重モードフィルタ２段と並列に弾性表面波共振器と、直列に弾性表面波共振器を１つずつを組み合わせた送信用フィルタを示す図である。It is a figure which shows the filter for transmission which combined the surface acoustic wave resonator in parallel with 2 steps | paragraphs of the longitudinally coupled double mode filter which shows 5th Example of this invention, and the surface acoustic wave resonator in series one by one. 本発明の第６実施例を示す並列に弾性表面波共振器と、直列に弾性表面波共振器を１つずつと縦結合二重モードフィルタ１段と直列に弾性表面波共振器と、並列に弾性表面波共振器を組み合わせた送信及び受信用フィルタを示す図である。A sixth embodiment of the present invention shows a surface acoustic wave resonator in parallel, one surface acoustic wave resonator in series, one stage of a longitudinally coupled double mode filter, and a surface acoustic wave resonator in series. It is a figure which shows the filter for transmission and reception which combined the surface acoustic wave resonator. 本発明の第７実施例を示す並列に弾性表面波共振器と、直列に弾性表面波共振器を１つずつと縦結合二重モードフィルタ１段と並列に弾性表面波共振器と、直列に弾性表面波共振器を組み合わせた送信及び受信用フィルタを示す図である。In a seventh embodiment of the present invention, a surface acoustic wave resonator is connected in parallel, a surface acoustic wave resonator is connected in series, and a surface acoustic wave resonator is connected in series with one stage of a longitudinally coupled double mode filter. It is a figure which shows the filter for transmission and reception which combined the surface acoustic wave resonator. 本発明の第８実施例を示す直列に弾性表面波共振器と、並列に弾性表面波共振器を１つずつと縦結合二重モードフィルタ１段と並列に弾性表面波共振器と、直列に弾性表面波共振器を組み合わせた送信及び受信用フィルタを示す図である。In the eighth embodiment of the present invention, a surface acoustic wave resonator is connected in series, a surface acoustic wave resonator is connected in parallel, and a surface acoustic wave resonator is connected in series with one stage of a longitudinally coupled double mode filter. It is a figure which shows the filter for transmission and reception which combined the surface acoustic wave resonator. 本発明の第９実施例を示す直列に弾性表面波共振器と、並列に弾性表面波共振器を１つずつと縦結合二重モードフィルタ１段と直列に弾性表面波共振器と、並列に弾性表面波共振器を組み合わせた送信及び受信用フィルタを示す図である。A ninth embodiment of the present invention shows a surface acoustic wave resonator in series, one surface acoustic wave resonator in parallel and one stage of a longitudinally coupled double mode filter, and a surface acoustic wave resonator in series. It is a figure which shows the filter for transmission and reception which combined the surface acoustic wave resonator. 従来の弾性表面波フィルタを用いた分波器の構成図である。It is a block diagram of the duplexer using the conventional surface acoustic wave filter. 一般の弾性表面波共振器を用いた分波器のＲＦ部の構成図である。It is a block diagram of the RF part of the duplexer using a general surface acoustic wave resonator. 従来の弾性表面波共振器を用いた梯子型の６段構成の受信用フィルタの構成図である。It is a block diagram of the reception filter of the ladder type 6 steps | paragraph structure using the conventional surface acoustic wave resonator.

符号の説明Explanation of symbols

１４ アンテナ
１５ 分波器
１６ 受信系側のアンプ
１７ 受信側ＳＡＷフィルタ
１８ パワーアンプ
１９ 送信側ＳＡＷフィルタ
１０１，２０１，３０１ 受信用フィルタの入力端子
１０２，２０２，３０２ 受信用フィルタの出力端子
１０３，２０３ 第１の弾性表面波共振器
１０４，２０４ 第２の弾性表面波共振器
１０５，２０５，３０４，４０３，５０３，６０５，７０５，８０５，９０５ 縦結合二重モードフィルタ
３０３，４０４，４０５，５０４，５０５，６０３，６０４，６０６，６０７，７０３，７０４，７０６，７０７，８０３，８０４，８０６，８０７，９０３，９０４，９０６，９０７ 弾性表面波共振器
４０１，５０１ 送信用フィルタの入力端子
４０２，５０２ 送信用フィルタの出力端子
６０１，７０１，８０１，９０１ 送信及び受信用フィルタの入力端子
６０２，７０２，８０２，９０２ 送信及び受信用フィルタの出力端子 DESCRIPTION OF SYMBOLS 14 Antenna 15 Demultiplexer 16 Reception system side amplifier 17 Reception side SAW filter 18 Power amplifier 19 Transmission side SAW filter 101, 201, 301 Reception filter input terminal 102, 202, 302 Reception filter output terminal 103, 203 First surface acoustic wave resonators 104, 204 Second surface acoustic wave resonators 105, 205, 304, 403, 503, 605, 705, 805, 905 Longitudinal coupled double mode filters 303, 404, 405, 504 505, 603, 604, 606, 607, 703, 704, 706, 707, 803, 804, 806, 807, 903, 904, 906, 907 Surface acoustic wave resonators 401, 501 Transmission filter input terminals 402, 502 Output terminal of transmission filter 601, 701, 801, 9 01 Input terminal for transmission and reception filter 602, 702, 802, 902 Output terminal for transmission and reception filter

Claims (5)

通過帯域の異なる送信用フィルタ及び受信用フィルタを有するＳＡＷ分波器において、
前記受信用フィルタは弾性表面波共振器で構成し、前記送信用フィルタを縦結合二重モードフィルタで構成し、前記送信用フィルタの出力側には、直列に第１の弾性表面波共振器が、並列に第２の弾性表面波共振器が設けられ、前記第１の弾性表面波共振器の一端は前記送信用フィルタの出力端子と接続されており、前記第２の弾性表面波共振器の一端は前記第１の弾性表面波共振器の前記一端に接続されていることを特徴とする分波器。 In a SAW duplexer having a transmission filter and a reception filter having different passbands,
The reception filter is composed of a surface acoustic wave resonator, the transmission filter is composed of a longitudinally coupled double mode filter, and a first surface acoustic wave resonator is connected in series on the output side of the transmission filter. , A second surface acoustic wave resonator is provided in parallel, and one end of the first surface acoustic wave resonator is connected to an output terminal of the transmission filter, and the second surface acoustic wave resonator includes: A duplexer characterized in that one end is connected to the one end of the first surface acoustic wave resonator. 請求項１記載の分波器において、前記送信用フィルタの入力側には、直列に第３の弾性表面波共振器が、並列に第４の弾性表面波共振器が設けられていることを特徴とする分波器。 In duplexer as claimed in claim 1, wherein the input side of the transmission filter, wherein the third surface acoustic wave resonator in series, the fourth surface acoustic wave resonator is provided in parallel A duplexer. 請求項２記載の分波器において、前記第３の弾性表面波共振器の一端は前記送信用フィルタの入力端子と接続されており、前記第４の弾性表面波共振器の一端は前記第３の弾性表面波共振器の前記一端に接続されていることを特徴とする分波器。 3. The duplexer according to claim 2 , wherein one end of the third surface acoustic wave resonator is connected to an input terminal of the transmission filter, and one end of the fourth surface acoustic wave resonator is the third surface. A duplexer connected to the one end of the surface acoustic wave resonator. 請求項２記載の分波器において、前記第３の弾性表面波共振器の一端は前記送信用フィルタの入力端子と接続されており、前記第４の弾性表面波共振器の一端は前記第３の弾性表面波共振器の他端に接続されていることを特徴とする分波器。 3. The duplexer according to claim 2 , wherein one end of the third surface acoustic wave resonator is connected to an input terminal of the transmission filter, and one end of the fourth surface acoustic wave resonator is the third surface. A duplexer connected to the other end of the surface acoustic wave resonator. 通過帯域の異なる送信用フィルタ及び受信用フィルタを有するＳＡＷ分波器において、
前記送信用フィルタは弾性表面波共振器で構成し、前記受信用フィルタを縦結合二重モードフィルタで構成し、前記受信用フィルタの入力側には、直列に第１の弾性表面波共振器が、並列に第２の弾性表面波共振器が設けられ、前記第１の弾性表面波共振器の一端は前記受信用フィルタの入力端子と接続されており、前記第２の弾性表面波共振器の一端は前記第１の弾性表面波共振器の前記一端に接続され、前記受信用フィルタの出力側には直列に第３の弾性表面波共振器が、並列に第４の弾性表面波共振器が設けられ、かつ前記第３の弾性表面波共振器の一端は前記受信用フィルタの出力端子と接続されており、前記第４の弾性表面波共振器の一端は前記第３の弾性表面波共振器の前記一端に接続されていることを特徴とする分波器。 In a SAW duplexer having a transmission filter and a reception filter having different passbands,
The transmission filter includes a surface acoustic wave resonator, the reception filter includes a longitudinally coupled dual mode filter, and a first surface acoustic wave resonator is connected in series to the input side of the reception filter. , A second surface acoustic wave resonator is provided in parallel, and one end of the first surface acoustic wave resonator is connected to an input terminal of the reception filter, and the second surface acoustic wave resonator includes: One end is connected to the one end of the first surface acoustic wave resonator, and a third surface acoustic wave resonator is connected in series to the output side of the reception filter, and a fourth surface acoustic wave resonator is connected in parallel. Provided, and one end of the third surface acoustic wave resonator is connected to an output terminal of the reception filter, and one end of the fourth surface acoustic wave resonator is connected to the third surface acoustic wave resonator. The duplexer is connected to the one end.
JP2007106075A 2007-04-13 2007-04-13 Branching filter employing surface acoustic wave filter Pending JP2007189747A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103236572A (en) * 2013-02-05 2013-08-07 南通大学 Compact microwave distributed double-mold band-pass filter
WO2014061694A1 (en) * 2012-10-19 2014-04-24 株式会社村田製作所 Antenna branching filter

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Publication number Priority date Publication date Assignee Title
JPH0766679A (en) * 1993-08-23 1995-03-10 Murata Mfg Co Ltd Branching filter
JPH07212183A (en) * 1994-01-20 1995-08-11 Matsushita Electric Ind Co Ltd Surface acoustic wave filter
JPH0998065A (en) * 1995-07-25 1997-04-08 Murata Mfg Co Ltd Surface acoustic wave device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0766679A (en) * 1993-08-23 1995-03-10 Murata Mfg Co Ltd Branching filter
JPH07212183A (en) * 1994-01-20 1995-08-11 Matsushita Electric Ind Co Ltd Surface acoustic wave filter
JPH0998065A (en) * 1995-07-25 1997-04-08 Murata Mfg Co Ltd Surface acoustic wave device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014061694A1 (en) * 2012-10-19 2014-04-24 株式会社村田製作所 Antenna branching filter
JPWO2014061694A1 (en) * 2012-10-19 2016-09-05 株式会社村田製作所 Antenna duplexer
CN103236572A (en) * 2013-02-05 2013-08-07 南通大学 Compact microwave distributed double-mold band-pass filter
CN103236572B (en) * 2013-02-05 2015-10-21 南通大学 The distributed bimodule band-pass filter of a kind of Compact microwave

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