JPH10313229A - Multi-terminal pair saw filter and its using method - Google Patents
Multi-terminal pair saw filter and its using methodInfo
- Publication number
- JPH10313229A JPH10313229A JP9121935A JP12193597A JPH10313229A JP H10313229 A JPH10313229 A JP H10313229A JP 9121935 A JP9121935 A JP 9121935A JP 12193597 A JP12193597 A JP 12193597A JP H10313229 A JPH10313229 A JP H10313229A
- Authority
- JP
- Japan
- Prior art keywords
- saw filter
- terminal pair
- saw
- terminal
- shared
- 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.)
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- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は、2個のSAWフ
ィルタを備えその入出力端子対のうち1個を共用化した
構成を有する多端子対SAWフィルタ及びその使用方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-port SAW filter having two SAW filters and having one of the input / output terminal pairs shared, and a method of using the same.
【0002】[0002]
【従来の技術】その通過域が互いに異なる2個のSAW
フィルタをその一端において並列に接続した構成を有す
る多端子対SAWフィルタは、SAW分波器として用い
られている。例えば「国内デジタル携帯電話用2重モー
ドSAWフィルタ」(渡辺他、1996年電子情報通信
学会基礎・境界ソサイエティ大会、A−198)には、
第1及び第2のSAWフィルタを整合回路を介し並列接
続し、並列接続に係る端子対(以下「共有端子対」)に
供給される受信信号のうちある特定の周波数成分は第1
のSAWフィルタの残りの端子対から、また他の特定の
周波数成分は第2のSAWフィルタの残りの端子対か
ら、というように分けて出力する(「分波する」)SA
W分波器が開示されている。また、「SAW共振器型分
波器の検討」(伊形他、1992年電子情報通信学会春
季大会、A−397)には、第1及び第2のSAWフィ
ルタを整合回路を介し並列接続し、並列接続に係る端子
対即ち共有端子対に供給される受信信号のうちある特定
の周波数成分を第1のSAWフィルタの残りの端子対か
ら出力させ、また第2のSAWフィルタの残りの端子対
に供給される送信信号のうち他の特定の周波数成分を共
有端子対から出力するSAW分波器が開示されている。
前者のように2個のSAWフィルタの入力端子対を共通
化したものは1入力2出力SAWフィルタと呼ぶことが
でき、後者のように一方のSAWフィルタにおける信号
の流れの向きが1入力2出力SAWフィルタのそれとは
逆のものはSAW送受共用器と呼ぶことができる。な
お、SAW分波器という言葉は、広義では、1入力2出
力SAWフィルタ及びSAW送受共用器双方を包括する
意味で用いられ、狭義ではSAW送受共用器のみを包括
する意味で用いられる。本願では、この言葉を広義にて
使用する。2. Description of the Related Art Two SAWs whose pass bands are different from each other
A multiport SAW filter having a configuration in which filters are connected in parallel at one end is used as a SAW duplexer. For example, "Double Mode SAW Filter for Domestic Digital Mobile Phones" (Watanabe et al., 1996 IEICE Basic and Boundary Society Conference, A-198)
The first and second SAW filters are connected in parallel via a matching circuit, and a specific frequency component of a received signal supplied to a pair of terminals connected in parallel (hereinafter, “shared terminal pair”) is a first frequency component.
From the remaining pair of terminals of the SAW filter, and other specific frequency components from the remaining pair of terminals of the second SAW filter, etc. (“demultiplex”) SA
A W splitter is disclosed. Also, in "Study of SAW resonator type duplexer" (Igata et al., 1992 IEICE Spring Conference, A-397), the first and second SAW filters are connected in parallel via a matching circuit. A specific frequency component of the received signal supplied to the terminal pair related to the parallel connection, that is, the shared terminal pair, is output from the remaining terminal pair of the first SAW filter, and the remaining terminal pair of the second SAW filter is output. A SAW duplexer that outputs another specific frequency component of the transmission signal supplied to the common terminal pair from the shared terminal pair is disclosed.
The one in which the input terminal pairs of the two SAW filters are shared as in the former can be called a one-input two-output SAW filter, and the direction of the signal flow in one SAW filter is one-input and two-output as in the latter. The opposite of a SAW filter can be called a SAW duplexer. The term SAW duplexer is used in a broad sense to include both a one-input two-output SAW filter and a SAW duplexer, and is used in a narrow sense to encompass only a SAW duplexer. In this application, this term is used in a broad sense.
【0003】これらの先行技術文献にて開示されている
SAW分波器は、いずれも、共有端子対に整合回路を設
けた構成を有している。具体的には、前者では一方のS
AWフィルタに直列に接続したIDT型コンデンサ及び
共有端子対間に並列接続したインダクタにて、後者では
プリント基板上で一方のSAWフィルタに直列に接続し
た遅延線及び共有端子対間に並列接続したインダクタに
て、共有端子対に設けるべき整合回路を実現している。
一般に、SAWフィルタの入力インピーダンスは通過帯
域外では容量性になるから、共有端子対間にインダクタ
を並列接続することにより、並列共振を起こさせること
ができる。即ち、一方のSAWフィルタの通過域に属し
ている周波数の信号にとって、他方のSAWフィルタの
入力インピーダンスがほぼ開放インピーダンスとなって
いる状態を、作り出すことができる。これにより、共有
端子対に供給される受信信号のうち一方のSAWフィル
タの通過域に属する周波数成分が他方のSAWフィルタ
をも通過し(1入力2出力フィルタ)或いは送信信号を
通すためのSAWフィルタの出力が受信信号を通すため
のSAWフィルタを通過してしまう(送受共用器)とい
った不具合を、概ね解消できる。[0003] Each of the SAW duplexers disclosed in these prior art documents has a configuration in which a matching circuit is provided for a shared terminal pair. Specifically, in the former, one S
An IDT capacitor connected in series to an AW filter and an inductor connected in parallel between a pair of common terminals. In the latter case, a delay line connected in series to one SAW filter on a printed circuit board and an inductor connected in parallel between a pair of common terminals. Realizes a matching circuit to be provided for the shared terminal pair.
Generally, the input impedance of the SAW filter becomes capacitive outside the pass band. Therefore, parallel resonance can be caused by connecting an inductor in parallel between the shared terminal pair. That is, for a signal having a frequency belonging to the pass band of one SAW filter, a state can be created in which the input impedance of the other SAW filter is almost open impedance. Thereby, a frequency component belonging to the pass band of one SAW filter among the reception signals supplied to the common terminal pair also passes through the other SAW filter (one-input two-output filter) or a SAW filter for transmitting the transmission signal. The problem that the output of (1) passes through a SAW filter for passing a received signal (transmitter / receiver) can generally be solved.
【0004】また、IDT型コンデンサ(前者)又は遅
延線(後者)を設けているのは、並列接続される2個の
SAWフィルタの入力インピーダンス特性の差異を見か
け上打ち消すためである。例えば、これら2個のSAW
フィルタのうち第1のSAWフィルタの通過域におい
て、共有端子対側から見た第2のSAWフィルタ単体の
インピーダンスが、上述のインダクタのインダクタンス
と正確に並列共振するように設定したとする。しかし、
このように設定したときには、第2のSAWフィルタの
通過域においては、共有端子対側から見た第1のSAW
フィルタ単体のインピーダンスは、上述のインダクタの
インダクタンスとは並列共振しない。これは、これら2
個のSAWフィルタの周波数特性が、分波という目的上
相違していなければならないためである。IDT型コン
デンサや遅延線を例えば第2のフィルタと共有端子対の
間に設けるのは、この相違を補償するため、即ち、第1
のSAWフィルタの通過域においては共有端子対側から
見た第2のSAWフィルタの見かけ上のインピーダンス
が、また第2のSAWフィルタの通過域においては共有
端子対側から見た第1のSAWフィルタのインピーダン
スが、上述のインダクタのインダクタンスと並列共振す
るようにするためである。言い換えれば、第1及び第2
のSAWフィルタ同士が互いに影響しあうことを、防止
するためである。An IDT capacitor (the former) or a delay line (the latter) is provided in order to apparently cancel out the difference in input impedance characteristics between two SAW filters connected in parallel. For example, these two SAWs
It is assumed that, in the pass band of the first SAW filter among the filters, the impedance of the second SAW filter alone as viewed from the shared terminal pair side is set to exactly resonate with the inductance of the inductor described above. But,
With this setting, in the pass band of the second SAW filter, the first SAW filter viewed from the shared terminal pair side is used.
The impedance of the filter alone does not resonate in parallel with the inductance of the inductor described above. This is these two
This is because the frequency characteristics of the SAW filters must be different for the purpose of demultiplexing. The provision of the IDT type capacitor and the delay line between the second filter and the common terminal pair, for example, is intended to compensate for this difference, that is, the first filter is provided.
In the pass band of the SAW filter, the apparent impedance of the second SAW filter as viewed from the shared terminal pair side, and in the pass band of the second SAW filter, the first SAW filter as viewed from the shared terminal pair side. Is to cause the impedance of the inductor to resonate in parallel with the inductance of the inductor described above. In other words, the first and second
In order to prevent the SAW filters from affecting each other.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、上述の
先行技術では、IDT型コンデンサや遅延線を設ける必
要があるため、装置構成が大きくなりまた挿入損失も発
生してしまう。However, in the above-mentioned prior art, since it is necessary to provide an IDT capacitor and a delay line, the configuration of the device becomes large and insertion loss occurs.
【0006】この発明は、上述の問題点を解消すること
を課題としてなされたものであり、従来よりも小型で低
損失の装置を実現することを目的とする。An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to realize a device which is smaller in size and lower in loss than a conventional device.
【0007】[0007]
【課題を解決するための手段】この発明に係る多端子対
SAWフィルタは、信号入出力のための共有端子対、第
1端子対及び第2端子対と、上記共有端子対及び上記第
1端子対を入出力端とし第1周波数帯域を通過域とする
第1SAWフィルタと、上記共有端子対及び上記第2端
子対を入出力端とし上記第1周波数帯域とは異なる第2
周波数帯域を通過域とする第2SAWフィルタと、上記
共有端子対間に接続されたインダクタとを設け、上記第
1周波数帯域では上記共有端子対から上記第2SAWフ
ィルタ側を見たインピーダンスが上記インダクタのイン
ダクタンスと並列共振しまた上記第2周波数帯域では上
記共有端子対から上記第1SAWフィルタ側を見たイン
ピーダンスが上記インダクタのインダクタンスと並列共
振するというインダクタ共有化条件が満たされるよう、
上記第1及び第2SAWフィルタの電極構造を定めたも
のである。According to the present invention, there is provided a multi-port SAW filter according to the present invention, comprising: a common terminal pair for inputting and outputting a signal; a first terminal pair and a second terminal pair; A first SAW filter having a pair as an input / output terminal and a passband in a first frequency band;
A second SAW filter having a pass band in a frequency band; and an inductor connected between the common terminal pair. In the first frequency band, an impedance of the second SAW filter as viewed from the common terminal pair is the impedance of the inductor. In order to satisfy the inductor sharing condition that impedance resonates in parallel with the inductance and in the second frequency band, the impedance when the first SAW filter side is viewed from the shared terminal pair resonates in parallel with the inductance of the inductor.
The electrode structure of the first and second SAW filters is defined.
【0008】この発明に係る多端子対SAWフィルタ
は、上記第1及び第2SAWフィルタのうち少なくとも
一方のSAWフィルタが、上記共有端子対に接続された
直列腕に属する第1SAW共振子及び当該直列腕に接続
された並列腕に属する第2SAW共振子を有し、上記第
1SAW共振子の電極指対数及び電極交差幅の積を上記
第2SAW共振子の電極指対数及び電極交差幅の積と乗
じた値を、上記インダクタ共有化条件を満たすよう定め
たものである。In the multi-port SAW filter according to the present invention, at least one of the first and second SAW filters is a first SAW resonator belonging to a series arm connected to the common terminal pair and the series arm. And the product of the number of electrode finger pairs and the electrode cross width of the first SAW resonator is multiplied by the product of the number of electrode finger pairs and the electrode cross width of the second SAW resonator. The value is determined so as to satisfy the inductor sharing condition.
【0009】この発明に係る多端子対SAWフィルタ
は、上記第1及び第2SAWフィルタのうち少なくとも
一方のSAWフィルタが、上記共有端子対に接続された
並列腕に属するSAW共振子を有し、上記SAW共振子
の電極指対数及び電極交差幅の積を、上記インダクタ共
有化条件を満たすよう定めたものである。In the multi-port SAW filter according to the present invention, at least one of the first and second SAW filters has a SAW resonator belonging to a parallel arm connected to the shared terminal pair. The product of the number of electrode finger pairs and the electrode intersection width of the SAW resonator is determined so as to satisfy the inductor sharing condition.
【0010】この発明に係る多端子対SAWフィルタの
使用方法は、上記共有端子対を上記第1SAWフィルタ
の入力端及び上記第2SAWフィルタの入力端として、
上記第1端子対を上記第1SAWフィルタの出力端とし
て、上記第2端子対を上記第2SAWフィルタの出力端
としてそれぞれ用いることにより、この発明に係る多端
子対SAWフィルタを以て分波器を構成するものであ
る。[0010] In the method of using a multi-port SAW filter according to the present invention, the shared terminal pair may be an input terminal of the first SAW filter and an input terminal of the second SAW filter.
By using the first terminal pair as an output terminal of the first SAW filter and the second terminal pair as an output terminal of the second SAW filter, a duplexer is configured with the multi-port SAW filter according to the present invention. Things.
【0011】この発明に係る多端子対SAWフィルタの
使用方法は、複数通りの周波数にて信号を受信可能な受
信回路と、当該複数通りの周波数にて共用される受信ア
ンテナと、この発明に係る多端子対SAWフィルタとを
備え、上記共有端子対を受信アンテナに、上記第1及び
第2端子対を上記受信回路にそれぞれ接続したものであ
る。A method of using a multiport SAW filter according to the present invention relates to a receiving circuit capable of receiving signals at a plurality of frequencies, a receiving antenna shared by the plurality of frequencies, and a method of using the SAW filter according to the present invention. A multi-terminal SAW filter, wherein the shared terminal pair is connected to a receiving antenna, and the first and second terminal pairs are connected to the receiving circuit.
【0012】この発明に係る多端子対SAWフィルタの
使用方法は、上記共有端子対を上記第1SAWフィルタ
の入力端及び上記第2SAWフィルタの出力端として、
上記第1端子対を上記第1SAWフィルタの出力端とし
て、上記第2端子対を上記第2SAWフィルタの入力端
としてそれぞれ用いることにより、この発明に係る多端
子対SAWフィルタを以て分波器を構成するものであ
る。[0012] In the method of using a multi-port SAW filter according to the present invention, the shared port pair may be an input terminal of the first SAW filter and an output terminal of the second SAW filter.
By using the first terminal pair as an output terminal of the first SAW filter and the second terminal pair as an input terminal of the second SAW filter, a duplexer is configured with the multi-terminal pair SAW filter according to the present invention. Things.
【0013】この発明に係る多端子対SAWフィルタの
使用方法は、対をなす受信回路及び送信回路と、当該受
信回路及び送信回路にて共用される送受信アンテナと、
この発明に係る多端子対SAWフィルタとを備え、上記
共有端子対を送受信アンテナに、上記第1端子対を上記
受信回路に、上記第2端子対を上記送信回路にそれぞれ
接続したものである。[0013] A method for using a multi-port SAW filter according to the present invention includes a pair of receiving circuit and transmitting circuit, a transmitting and receiving antenna shared by the receiving circuit and transmitting circuit, and
A multi-port SAW filter according to the present invention, wherein the shared terminal pair is connected to a transmitting / receiving antenna, the first terminal pair is connected to the receiving circuit, and the second terminal pair is connected to the transmitting circuit.
【0014】[0014]
【発明の実施の形態】以下、この発明の実施の形態に関
し図面に基づき説明する。なお、実施の形態間で共通す
る部材には同一の符号を付し説明を省略する。Embodiments of the present invention will be described below with reference to the drawings. Note that members common to the embodiments are denoted by the same reference numerals, and description thereof is omitted.
【0015】実施の形態1.図1に、本発明の実施の形
態1に係る装置の使用形態の一例を示す。図中、符号1
で示される移動体通信用端末は周波数f1及びf2で信
号を受信する受信回路2、これらの周波数f1及びf2
にて共用される受信アンテナ3、並びに受信アンテナ3
と受信回路2の間に設けられこの実施の形態に係る1入
力2出力SAWフィルタ4を有している。1入力2出力
SAWフィルタ4は、受信アンテナ3との接続に係る共
有端子対4a並びに受信回路2との接続に係る第1端子
対4b及び第2端子対4cを備えている。第1端子対4
bは周波数f1の受信に、また第2端子対4cは周波数
f2の受信に、それぞれ用いられる。Embodiment 1 FIG. 1 shows an example of a usage pattern of the device according to the first embodiment of the present invention. In the figure, reference numeral 1
Is a receiving circuit 2 for receiving signals at frequencies f1 and f2;
Receiving antenna 3 and receiving antenna 3 shared by
1 and 2 output SAW filter 4 according to this embodiment, which is provided between the SAW filter 4 and the receiving circuit 2. The one-input / two-output SAW filter 4 includes a shared terminal pair 4a for connection to the reception antenna 3, and a first terminal pair 4b and a second terminal pair 4c for connection to the reception circuit 2. First terminal pair 4
b is used for receiving the frequency f1, and the second terminal pair 4c is used for receiving the frequency f2.
【0016】1入力2出力SAWフィルタ4は、図2に
示すように、周波数f1をその通過域に含むSAWフィ
ルタF1及び周波数f2をその通過域に含むSAWフィ
ルタF2を有している。SAWフィルタF1及びF2の
一方の端は共有端子対4aに接続されており、またSA
WフィルタF1の他方の端子対は第1端子対4bに、ま
たSAWフィルタF2の他方の端子対は第2端子対4c
に、それぞれ接続されている。また、共有端子対4aに
はインダクタLpが接続されている。なお、各端子対4
a、4b及び4c、SAWフィルタF1及びF2並びに
インダクタLpは、いずれも接地Gを共用している。As shown in FIG. 2, the one-input two-output SAW filter 4 has a SAW filter F1 including a frequency f1 in its pass band and a SAW filter F2 including a frequency f2 in its pass band. One end of each of the SAW filters F1 and F2 is connected to the common terminal pair 4a.
The other terminal pair of the W filter F1 is connected to the first terminal pair 4b, and the other terminal pair of the SAW filter F2 is connected to the second terminal pair 4c.
, Respectively. The inductor Lp is connected to the common terminal pair 4a. Note that each terminal pair 4
a, 4b and 4c, the SAW filters F1 and F2, and the inductor Lp all share the ground G.
【0017】図3に、この実施の形態におけるSAWフ
ィルタF1及びF2の構成をより詳細に示す。図中、符
号Rs11、Rp11、Rs12、Rp12、Rs2
1、Rp21、Rs22及びRp22で表されているの
は、それぞれ、SAW共振子である。これらのうち、R
s11、Rs12、Rs21及びRs22は直列腕に、
またRp11、Rp12、Rp21及びRp22は並列
腕に、それぞれ設けられている。SAWフィルタF1及
びF2は、それぞれ、これらをラダー接続した構成を有
している。なお、この発明を解釈する際には、当該ラダ
ー接続を構成する共振子の個数を4に限定する必要はな
い。FIG. 3 shows the configuration of the SAW filters F1 and F2 in this embodiment in more detail. In the figure, symbols Rs11, Rp11, Rs12, Rp12, Rs2
1, Rp21, Rs22 and Rp22 are SAW resonators, respectively. Of these, R
s11, Rs12, Rs21 and Rs22 are connected to the serial arm,
Rp11, Rp12, Rp21 and Rp22 are provided on the parallel arms, respectively. Each of the SAW filters F1 and F2 has a configuration in which they are ladder-connected. In interpreting the present invention, it is not necessary to limit the number of resonators forming the ladder connection to four.
【0018】また、この実施の形態では、SAW共振子
Rs11等として、例えば図4に示す電極配置を有する
共振子を用いる。図中、符号5で表されているのはID
T(インターディジタルトランスデューサ)であり、そ
の左右に配置されているのは反射器6である。但し、反
射器6を用いずIDT5のみで共振子を構成することも
できる。また、IDT5は、一方の端子から延長された
複数の電極指と他方の端子から引き出された電極指とが
丁度指を交差した如く噛み合うよう、かつ電極指の間隔
が所望の共振周波数に応じた間隔となるよう、設定され
る。図中、Nで表されているのは、IDT5を構成する
電極指の対数であり、Wで表されているのは、一方の端
子から引き出された電極指と他方の端子から引き出され
た電極指とが交差する幅である。In this embodiment, for example, a resonator having the electrode arrangement shown in FIG. 4 is used as the SAW resonator Rs11 and the like. In the figure, reference numeral 5 denotes an ID.
T (inter digital transducer), and reflectors 6 disposed on the left and right of the T. However, it is also possible to configure the resonator only with the IDT 5 without using the reflector 6. Also, the IDT 5 has a configuration in which a plurality of electrode fingers extended from one terminal and an electrode finger drawn from the other terminal are engaged with each other just as if the fingers intersect, and the interval between the electrode fingers corresponds to a desired resonance frequency. It is set to be the interval. In the figure, N represents the number of pairs of electrode fingers constituting the IDT 5, and W represents the number of electrode fingers extracted from one terminal and the number of electrode fingers extracted from the other terminal. The width at which the finger intersects.
【0019】図3及び図4に示すごとき構成を用いる場
合、共有端子対4a側からSAWフィルタF1単体を見
たときの入力インピーダンスは、SAW共振子Rs11
のIDT5にて発生した側結合容量と、SAW共振子R
p11のIDT5にて発生した側結合容量との積の−1
/2乗に比例する。また、IDT5にて生ずる側結合容
量は、その電極指対Nと交差幅Wの積に比例する。従っ
て、共有端子対4aから見たSAWフィルタV1単体の
入力インピーダンスは、SAW共振子Rs11及びRp
11各々のIDT5における電極指対数N及び交差幅W
によって、決定することができる。同様に、共有端子対
4aから見たSAWフィルタF2単体の入力インピーダ
ンスは、SAW共振子Rs21及びRp21各々のID
T5における電極指対数N及び交差幅Wによって決定す
ることができる。この実施の形態では、共有端子対4a
から見たSAWフィルタF2単体のインピーダンスがS
AWフィルタF1の通過域においてインダクタLpのイ
ンダクタンスと並列共振し、また共有端子対4aから見
たSAWフィルタF1単体のインピーダンスがSAWフ
ィルタF2の通過域においてインダクタLpのインダク
タンスと並列共振するよう、少なくともSAW共振子R
s11、Rp11、Rs21及びRp21のIDT5に
おける電極指対数N及び交差幅Wを設定している。When the configuration shown in FIGS. 3 and 4 is used, when the SAW filter F1 alone is viewed from the shared terminal pair 4a side, the input impedance is the SAW resonator Rs11.
Side coupling capacitance generated in the IDT 5 of FIG.
-1 of the product of p11 and the side coupling capacitance generated in IDT5
/ 2 power. The side coupling capacitance generated in the IDT 5 is proportional to the product of the electrode finger pair N and the intersection width W. Accordingly, the input impedance of the SAW filter V1 alone viewed from the shared terminal pair 4a is equal to the SAW resonators Rs11 and Rp11.
11 Number of electrode finger pairs N and intersection width W in each IDT 5
Can be determined by Similarly, the input impedance of the SAW filter F2 alone viewed from the shared terminal pair 4a is the ID of each of the SAW resonators Rs21 and Rp21.
It can be determined by the number N of electrode fingers and the intersection width W at T5. In this embodiment, the shared terminal pair 4a
The impedance of the SAW filter F2 alone viewed from
At least the SAW filter is designed to resonate in parallel with the inductance of the inductor Lp in the pass band of the AW filter F1, and to resonate in parallel with the inductance of the inductor Lp in the pass band of the SAW filter F2 when viewed from the shared terminal pair 4a. Resonator R
The number N of electrode fingers and the intersection width W in IDT5 of s11, Rp11, Rs21, and Rp21 are set.
【0020】図5及び図6に、このような設定の原理及
び効果を示す。まず、SAWフィルタは、一般に、図5
のスミスチャート上に曲線で示すごとき特性を有してい
る。図中、符号Pで表されているのは通過域近傍の特性
であり、またL及びHで表されているのはそれぞれ通過
域から見て低域側及び高域側における特性である。スミ
スチャートでは、一般に、上半部の半円が誘導性のイン
ピーダンスを、下半分の半円が容量性のインピーダンス
を、そして円の中心が整合状態を、それぞれ表している
から、図5に示されている特性からは、SAWフィルタ
の通過域外のインピーダンスが概ね容量性となることを
理解することができる。FIGS. 5 and 6 show the principle and effect of such setting. First, the SAW filter generally has the configuration shown in FIG.
Has a characteristic as shown by a curve on the Smith chart. In the figure, the symbol P indicates the characteristic in the vicinity of the pass band, and the symbols L and H indicate the characteristic on the low band side and the high band side when viewed from the pass band, respectively. In the Smith chart, the upper half of the circle generally represents the inductive impedance, the lower half of the circle represents the capacitive impedance, and the center of the circle represents the matching state. From the characteristics described above, it can be understood that the impedance outside the pass band of the SAW filter is substantially capacitive.
【0021】図1乃至図4に示した実施の形態では、図
5に示すごときSAWフィルタの一般特性を利用して、
コンデンサや遅延線を整合回路の一部として用いる必要
がない分波器を実現している。すなわち、図6に示すよ
うに、SAWフィルタF1の特性を曲線L1−P1−H
1のごとき特性とし、またSAWフィルタF2の特性を
L2−P2−H2のごとき特性とする、というインピー
ダンス設計を行い、SAWフィルタF1の通過域(P
1)では、SAWフィルタF2がL2近傍で動作し、ま
たSAWフィルタF2の通過域(P2)ではSAWフィ
ルタF1がH1近傍で動作するようにすれば、整合回路
としては単一のインダクタLpを用いるのみで、目的と
する分波、すなわちSAWフィルタF1及びF2の一方
から他方への影響の防止という効果を、達成することが
できる。なお、周波数f1は周波数f2よりも低いもの
とする。この実施形態によれば、従って、従来に比べ回
路素子数が少なく従って小型な装置を得ることができ
る。また、コンデンサや遅延線が介在しない分は、挿入
損失も低減されることになるから、移動体通信用端末装
置1全体としても損失を低減することができ、より携帯
性に優れた省電力の装置の実現に寄与することができ
る。In the embodiment shown in FIGS. 1 to 4, the general characteristics of the SAW filter as shown in FIG.
It realizes a duplexer that does not require the use of capacitors and delay lines as part of a matching circuit. That is, as shown in FIG. 6, the characteristics of the SAW filter F1 are represented by a curve L1-P1-H.
1 and the characteristic of the SAW filter F2 is set to a characteristic such as L2-P2-H2, and the pass band (P
In 1), if the SAW filter F2 operates near L2 and the SAW filter F1 operates near H1 in the pass band (P2) of the SAW filter F2, a single inductor Lp is used as a matching circuit. With only this, it is possible to achieve the effect of preventing the target demultiplexing, that is, the effect of preventing one of the SAW filters F1 and F2 from affecting the other. Note that the frequency f1 is lower than the frequency f2. According to this embodiment, therefore, it is possible to obtain a small-sized device having a smaller number of circuit elements than the conventional device. In addition, since the insertion loss is reduced because the capacitor and the delay line are not interposed, the loss can be reduced as a whole of the mobile communication terminal device 1, and the power saving of the mobile communication terminal device is more excellent. It can contribute to the realization of the device.
【0022】実施の形態2.図7及び図8に、この発明
の実施の形態2に係る装置の構成を示す。まず、図7に
示す移動体通信用端末装置1Aは、周波数f1の信号を
受信する受信回路2、周波数f2の信号を送信する送信
回路7、受信回路2と送信回路7とで共用される送受信
アンテナ3A、並びに送受信アンテナ3Aによって受信
された信号をその共有端子対4aから入力し第1端子対
4dを介して受信回路2に与えまた送信回路7からその
第2端子対4eを介して入力された信号を共有端子対4
aを介して送受信アンテナ3Aに与える送受共用器4A
から構成されている。送受共用器4Aは、図8に示すよ
うに、周波数f1をその通過域に含むSAWフィルタF
R及び周波数f2をその通過域に含むSAWフィルタF
Tを、図2に示すSAWフィルタF1及びF2に代えて
設けた構成を有している。但し、周波数f1と周波数f
2は異なる値であるとする。このように、この発明は、
図2に示す1入力2出力SAWフィルタとしてのみでは
なく、SAW送受共用器としても実現することができ
る。Embodiment 2 FIG. 7 and 8 show a configuration of an apparatus according to Embodiment 2 of the present invention. First, the mobile communication terminal device 1A shown in FIG. 7 includes a receiving circuit 2 for receiving a signal of frequency f1, a transmitting circuit 7 for transmitting a signal of frequency f2, and transmission / reception shared by the receiving circuit 2 and the transmitting circuit 7. Signals received by the antenna 3A and the transmission / reception antenna 3A are input from the common terminal pair 4a and supplied to the receiving circuit 2 via the first terminal pair 4d, and input from the transmission circuit 7 via the second terminal pair 4e. Shared signal pair 4
transmission / reception duplexer 4A provided to transmission / reception antenna 3A via a
It is composed of As shown in FIG. 8, the duplexer 4A includes a SAW filter F including a frequency f1 in its pass band.
SAW filter F including R and frequency f2 in its passband
T has a configuration provided in place of the SAW filters F1 and F2 shown in FIG. However, the frequency f1 and the frequency f
2 is a different value. Thus, the present invention
Not only the one-input two-output SAW filter shown in FIG. 2 but also a SAW duplexer can be realized.
【0023】実施の形態3.図9に、この発明の実施の
形態3にて用いるSAWフィルタの内部構成の一例を示
す。この実施の形態は、前述の実施の形態1及び2のい
ずれかにおいて、SAWフィルタF1、F2、FRまた
はFTの内部における共振子の接続状態を変形したもの
である。すなわち、前述の図3においては、共有端子対
4a寄りに直列腕が設けられていたが、この実施の形態
では直列腕ではなく並列腕が設けられている。図中、R
p1及びRp2は並列腕に属するSAW共振子、またR
s1及びRs2は直列腕に属するSAW共振子である。
このような構成を採用した場合にも、前述の実施の形態
1または2と同様の作用効果を得ることができる。な
お、図9に示す構成の場合、共有端子対4aから見たS
AWフィルタ単体のインピーダンスは、概ね、SAW共
振子Rp1のIDT5における電極指対数Nとその交差
幅Wとによって定まるから、図6に示す如き特性設計
は、SAW共振子Rp1のIDT5の電極構造にて行
う。Embodiment 3 FIG. FIG. 9 shows an example of the internal configuration of a SAW filter used in Embodiment 3 of the present invention. This embodiment is obtained by modifying the connection state of the resonator inside SAW filter F1, F2, FR or FT in any one of the first and second embodiments. That is, in FIG. 3 described above, the serial arm is provided near the shared terminal pair 4a, but in this embodiment, a parallel arm is provided instead of the serial arm. In the figure, R
p1 and Rp2 are SAW resonators belonging to the parallel arm, and R1
s1 and Rs2 are SAW resonators belonging to the series arm.
Even when such a configuration is adopted, the same operation and effect as those of the first or second embodiment can be obtained. In the case of the configuration shown in FIG. 9, S as viewed from the shared terminal pair 4a
Since the impedance of the AW filter alone is generally determined by the number N of electrode fingers in the IDT 5 of the SAW resonator Rp1 and the cross width W thereof, the characteristic design shown in FIG. 6 is based on the electrode structure of the IDT 5 of the SAW resonator Rp1. Do.
【0024】[0024]
【発明の効果】この発明に係る多端子対SAWフィルタ
によれば、第1周波数帯域では共有端子対から第2SA
Wフィルタ側を見たインピーダンスが、また第2周波数
帯域では共有端子対から第1SAWフィルタ側を見たイ
ンピーダンスが、共有端子対間に接続されたインダクタ
のインダクタンスと並列共振するよう、第1及び第2S
AWフィルタの電極構造を定めたため、第1及び第2S
AWフィルタの特性差を補うためのコンデンサや遅延線
を設ける必要がなく、従来に比べ寸法が小さくまた挿入
損失が小さな装置が得られる。According to the multi-port SAW filter of the present invention, the second SA from the shared port in the first frequency band.
The first and second impedances are viewed so that the impedance when viewed from the W filter side and the impedance when viewed from the shared terminal pair to the first SAW filter side in the second frequency band resonate in parallel with the inductance of the inductor connected between the shared terminal pair. 2S
Since the electrode structure of the AW filter is determined, the first and second S
There is no need to provide a capacitor or a delay line for compensating for the difference in characteristics of the AW filter, and a device having a smaller size and a smaller insertion loss than the conventional device can be obtained.
【0025】この発明に係る多端子対SAWフィルタに
よれば、第1及び第2SAWフィルタのうち少なくとも
一方のSAWフィルタを、共有端子対に接続された直列
腕に属する第1SAW共振子及び当該直列腕に接続され
た並列腕に属する第2SAW共振子を有する構成とする
ことにより、第1SAW共振子の電極指対数及び電極交
差幅の積に第2SAW共振子の電極指対数及び電極交差
幅の積を乗じた値の設定にて、インダクタを共有化しま
たコンデンサや遅延線を廃止するための条件を満足させ
ることができる。According to the multi-port SAW filter according to the present invention, at least one of the first and second SAW filters is replaced with the first SAW resonator belonging to the series arm connected to the shared terminal pair and the series arm. And the product of the number of electrode fingers and the electrode cross width of the first SAW resonator is multiplied by the product of the number of electrode fingers and the electrode cross width of the second SAW resonator. By setting the multiplied value, the conditions for sharing the inductor and eliminating the capacitor and the delay line can be satisfied.
【0026】この発明に係る多端子対SAWフィルタに
よれば、第1及び第2SAWフィルタのうち少なくとも
一方のSAWフィルタを、共有端子対に接続された並列
腕に属するSAW共振子を有する構成とすることによ
り、SAW共振子の電極指対数及び電極交差幅の積の設
定にて、インダクタを共有化しまたコンデンサや遅延線
を廃止するための条件を満足させることができる。According to the multi-port SAW filter according to the present invention, at least one of the first and second SAW filters has a SAW resonator belonging to a parallel arm connected to the shared terminal pair. Thus, by setting the product of the number of electrode fingers and the electrode cross width of the SAW resonator, the conditions for sharing the inductor and eliminating the capacitor and the delay line can be satisfied.
【0027】この発明に係る多端子対SAWフィルタの
使用方法によれば、共有端子対を第1SAWフィルタの
入力端及び第2SAWフィルタの入力端として、第1端
子対を第1SAWフィルタの出力端として、第2端子対
を第2SAWフィルタの出力端としてそれぞれ用いるこ
とにより、この発明に係る多端子対SAWフィルタを以
て分波器を構成することができる。According to the method of using the multi-port SAW filter according to the present invention, the shared terminal pair is used as the input terminal of the first SAW filter and the input terminal of the second SAW filter, and the first terminal pair is used as the output terminal of the first SAW filter. By using the second terminal pair as the output terminal of the second SAW filter, a duplexer can be configured with the multi-terminal pair SAW filter according to the present invention.
【0028】この発明に係る多端子対SAWフィルタの
使用方法によれば、複数通りの周波数にて信号を受信可
能な受信回路と、当該複数通りの周波数にて共用される
受信アンテナと、この発明に係る多端子対SAWフィル
タとを設け、共有端子対を受信アンテナに、第1及び第
2端子対を受信回路にそれぞれ接続することにより、複
数通りの周波数にて信号を受信する際その効率化を実現
でき、特に移動体通信用端末に適する装置を実現でき
る。According to the method of using a multiport SAW filter according to the present invention, a receiving circuit capable of receiving signals at a plurality of frequencies, a receiving antenna shared by the plurality of frequencies, And the first and second pairs of terminals are connected to a receiving circuit, respectively, so that the efficiency of receiving signals at a plurality of frequencies can be improved. And, in particular, a device suitable for a mobile communication terminal can be realized.
【0029】この発明に係る多端子対SAWフィルタの
使用方法によれば、共有端子対を第1SAWフィルタの
入力端及び第2SAWフィルタの出力端として、第1端
子対を第1SAWフィルタの出力端として、第2端子対
を第2SAWフィルタの入力端としてそれぞれ用いるこ
とにより、この発明に係る多端子対SAWフィルタを以
て分波器を構成することができる。According to the method of using the multi-port SAW filter according to the present invention, the shared terminal pair is used as the input terminal of the first SAW filter and the output terminal of the second SAW filter, and the first terminal pair is used as the output terminal of the first SAW filter. By using the second terminal pair as the input terminal of the second SAW filter, a duplexer can be configured with the multi-terminal pair SAW filter according to the present invention.
【0030】この発明に係る多端子対SAWフィルタの
使用方法によれば、対をなす受信回路及び送信回路と、
当該受信回路及び送信回路にて共用される送受信アンテ
ナと、この発明に係る多端子対SAWフィルタとを設
け、共有端子対を送受信アンテナに、第1端子対を受信
回路に、第2端子対を送信回路にそれぞれ接続すること
により、送受信を単一のアンテナにて共用する際その効
率化を実現でき、特に移動体通信用端末に適する装置を
実現できる。According to the method of using the multi-port SAW filter according to the present invention, a pair of receiving circuit and transmitting circuit;
A transmission / reception antenna shared by the reception circuit and the transmission circuit and the multi-port SAW filter according to the present invention are provided, and the shared terminal pair is used as the transmission / reception antenna, the first terminal pair is used as the reception circuit, and the second terminal pair is used as the reception terminal. By connecting to a transmission circuit, efficiency can be improved when transmission and reception are shared by a single antenna, and a device particularly suitable for a mobile communication terminal can be realized.
【図1】 この発明の実施の形態1に係る装置を利用可
能な移動体通信用端末装置の構成を示すブロック図であ
る。FIG. 1 is a block diagram showing a configuration of a mobile communication terminal device that can use the device according to Embodiment 1 of the present invention.
【図2】 この発明の実施の形態1に係る多端子対SA
Wフィルタの構成を示す回路図である。FIG. 2 shows a multi-terminal pair SA according to the first embodiment of the present invention.
FIG. 3 is a circuit diagram illustrating a configuration of a W filter.
【図3】 この発明の実施の形態1におけるSAWフィ
ルタの内部構成の一例を示す回路図である。FIG. 3 is a circuit diagram showing an example of an internal configuration of the SAW filter according to the first embodiment of the present invention.
【図4】 この発明の実施の形態1における共振子の構
成特に電極配置の一例を示す平面図である。FIG. 4 is a plan view showing an example of the configuration of a resonator, particularly an electrode arrangement, according to Embodiment 1 of the present invention.
【図5】 SAWフィルタの一般的な特性例を示すスミ
スチャートである。FIG. 5 is a Smith chart showing a typical characteristic example of a SAW filter.
【図6】 この発明の実施の形態1におけるSAWフィ
ルタの特性設定例を示すスミスチャートである。FIG. 6 is a Smith chart showing a characteristic setting example of a SAW filter according to the first embodiment of the present invention.
【図7】 この発明の実施の形態2に係る多端子対SA
Wフィルタを使用可能な移動体通信用端末装置の構成を
示すブロック図である。FIG. 7 shows a multi-terminal pair SA according to Embodiment 2 of the present invention.
It is a block diagram which shows the structure of the mobile communication terminal device which can use a W filter.
【図8】 この発明の実施の形態2に係る多端子対SA
Wフィルタの構成を示す回路図である。FIG. 8 shows a multi-terminal pair SA according to Embodiment 2 of the present invention.
FIG. 3 is a circuit diagram illustrating a configuration of a W filter.
【図9】 この発明の実施の形態3に係る多端子対SA
WフィルタにおけるSAWフィルタの内部構成の一例を
示す回路図である。FIG. 9 shows a multi-terminal pair SA according to Embodiment 3 of the present invention.
FIG. 3 is a circuit diagram illustrating an example of an internal configuration of a SAW filter in a W filter.
1,1A 移動体通信用端末装置、2 受信回路、3
受信アンテナ、3A送受信アンテナ、4 1入力2出力
SAWフィルタ、4A 送受共用器、4a共有端子対、
4b,4d 第1端子対、4c,4e 第2端子対、5
IDT、6 反射器、7 送信回路、F1,F2,F
R,FT SAWフィルタ、Lpインダクタ、Rs1
1,Rp11,Rs12,Rp12,Rs21,Rp2
1,Rs22,Rp22,Rp1,Rs1,Rp2,R
s2 SAW共振子、f1,f2 周波数。1, 1A mobile communication terminal device, 2 receiving circuit, 3
Receiving antenna, 3A transmitting / receiving antenna, 41-input 2-output SAW filter, 4A duplexer, 4a shared terminal pair,
4b, 4d first terminal pair, 4c, 4e second terminal pair, 5
IDT, 6 reflector, 7 transmission circuit, F1, F2, F
R, FT SAW filter, Lp inductor, Rs1
1, Rp11, Rs12, Rp12, Rs21, Rp2
1, Rs22, Rp22, Rp1, Rs1, Rp2, R
s2 SAW resonator, f1, f2 frequency.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 寺 佳子 東京都千代田区丸の内二丁目2番3号 三 菱電機株式会社内 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshiko Tera 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation
Claims (7)
子対及び第2端子対と、上記共有端子対及び上記第1端
子対を入出力端とし第1周波数帯域を通過域とする第1
SAWフィルタと、上記共有端子対及び上記第2端子対
を入出力端とし上記第1周波数帯域とは異なる第2周波
数帯域を通過域とする第2SAWフィルタと、上記共有
端子対間に接続されたインダクタとを備え、上記第1周
波数帯域では上記共有端子対から上記第2SAWフィル
タ側を見たインピーダンスが上記インダクタのインダク
タンスと並列共振しまた上記第2周波数帯域では上記共
有端子対から上記第1SAWフィルタ側を見たインピー
ダンスが上記インダクタのインダクタンスと並列共振す
るというインダクタ共有化条件が満たされるよう、上記
第1及び第2SAWフィルタの電極構造を定めたことを
特徴とする多端子対SAWフィルタ。1. A shared terminal pair for signal input / output, a first terminal pair and a second terminal pair, the shared terminal pair and the first terminal pair being input / output terminals, and a first frequency band being a pass band. First
A SAW filter, a second SAW filter using the shared terminal pair and the second terminal pair as input / output terminals and a passband in a second frequency band different from the first frequency band, and a SAW filter connected between the shared terminal pair; An impedance when viewed from the shared terminal pair side to the second SAW filter side in the first frequency band and resonates in parallel with an inductance of the inductor; and in the second frequency band, from the shared terminal pair to the first SAW filter. A multi-port SAW filter, characterized in that the electrode structure of the first and second SAW filters is determined so that an inductor sharing condition that impedance viewed from the side resonates in parallel with inductance of the inductor is satisfied.
少なくとも一方のSAWフィルタが、上記共有端子対に
接続された直列腕に属する第1SAW共振子及び当該直
列腕に接続された並列腕に属する第2SAW共振子を有
し、上記第1SAW共振子の電極指対数及び電極交差幅
の積を上記第2SAW共振子の電極指対数及び電極交差
幅の積と乗じた値を、上記インダクタ共有化条件を満た
すよう定めたことを特徴とする請求項1記載の多端子対
SAWフィルタ。2. At least one of the first and second SAW filters is a first SAW resonator belonging to a series arm connected to the shared terminal pair and a second SAW resonator belonging to a parallel arm connected to the series arm. A value obtained by multiplying the product of the number of electrode fingers and the electrode cross width of the first SAW resonator by the product of the number of electrode fingers and the electrode cross width of the second SAW resonator is defined as the inductor sharing condition. 2. The multiport SAW filter according to claim 1, wherein the filter is set to satisfy the condition.
少なくとも一方のSAWフィルタが、上記共有端子対に
接続された並列腕に属するSAW共振子を有し、上記S
AW共振子の電極指対数及び電極交差幅の積を、上記イ
ンダクタ共有化条件を満たすよう定めたことを特徴とす
る請求項1又は2記載の多端子対SAWフィルタ。3. The SAW filter according to claim 1, wherein at least one of said first and second SAW filters has a SAW resonator belonging to a parallel arm connected to said common terminal pair.
3. The multi-port SAW filter according to claim 1, wherein a product of the number of electrode finger pairs and the electrode cross width of the AW resonator satisfies the inductor sharing condition.
タの入力端及び上記第2SAWフィルタの入力端とし
て、上記第1端子対を上記第1SAWフィルタの出力端
として、上記第2端子対を上記第2SAWフィルタの出
力端としてそれぞれ用いることにより、請求項1乃至3
のいずれかに記載の多端子対SAWフィルタを以て分波
器を構成することを特徴とする多端子対SAWフィルタ
の使用方法。4. The first terminal pair as the output terminal of the first SAW filter, the shared terminal pair as the input terminal of the first SAW filter and the input terminal of the second SAW filter, and the second terminal pair as the second terminal. Claims 1 to 3 are respectively used as output terminals of a 2SAW filter.
A method of using a multiport SAW filter, comprising configuring a duplexer with the multiport SAW filter according to any one of the above.
受信回路と、当該複数通りの周波数にて共用される受信
アンテナと、請求項1乃至3記載の多端子対SAWフィ
ルタとを備え、上記共有端子対を受信アンテナに、上記
第1及び第2端子対を上記受信回路にそれぞれ接続した
ことを特徴とする請求項4記載の多端子対SAWフィル
タの使用方法。5. A receiving circuit capable of receiving signals at a plurality of frequencies, a receiving antenna shared by the plurality of frequencies, and a multi-port SAW filter according to claim 1; 5. The method according to claim 4, wherein the shared terminal pair is connected to a receiving antenna, and the first and second terminal pairs are connected to the receiving circuit, respectively.
タの入力端及び上記第2SAWフィルタの出力端とし
て、上記第1端子対を上記第1SAWフィルタの出力端
として、上記第2端子対を上記第2SAWフィルタの入
力端としてそれぞれ用いることにより、請求項1乃至3
のいずれかに記載の多端子対SAWフィルタを以て分波
器を構成することを特徴とする多端子対SAWフィルタ
の使用方法。6. The pair of shared terminals serves as an input terminal of the first SAW filter and the output terminal of the second SAW filter, the first terminal pair serves as an output terminal of the first SAW filter, and the second terminal pair serves as a terminal of the first SAW filter. Claims 1 through 3 are used as input terminals of a 2SAW filter.
A method of using a multiport SAW filter, comprising configuring a duplexer with the multiport SAW filter according to any one of the above.
受信回路及び送信回路にて共用される送受信アンテナ
と、請求項1乃至3記載の多端子対SAWフィルタとを
備え、上記共有端子対を送受信アンテナに、上記第1端
子対を上記受信回路に、上記第2端子対を上記送信回路
にそれぞれ接続したことを特徴とする請求項6記載の多
端子対SAWフィルタの使用方法。7. A shared terminal pair comprising: a pair of a receiving circuit and a transmitting circuit; a transmitting / receiving antenna shared by the receiving circuit and the transmitting circuit; and the multi-port SAW filter according to claim 1; 7. The method of using a multi-port SAW filter according to claim 6, wherein the first terminal pair is connected to the receiving circuit, and the second terminal pair is connected to the transmitting circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9121935A JPH10313229A (en) | 1997-05-13 | 1997-05-13 | Multi-terminal pair saw filter and its using method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9121935A JPH10313229A (en) | 1997-05-13 | 1997-05-13 | Multi-terminal pair saw filter and its using method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH10313229A true JPH10313229A (en) | 1998-11-24 |
Family
ID=14823582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9121935A Pending JPH10313229A (en) | 1997-05-13 | 1997-05-13 | Multi-terminal pair saw filter and its using method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH10313229A (en) |
Cited By (18)
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---|---|---|---|---|
JP2003209487A (en) * | 2001-12-13 | 2003-07-25 | Agilent Technol Inc | Filtering method using duplexer with differential receiver port |
GB2388727A (en) * | 2002-05-16 | 2003-11-19 | Murata Manufacturing Co | Surface acoustic wave duplexer includes inductors |
US6713940B2 (en) | 2001-01-10 | 2004-03-30 | Murata Manufacturing Co., Ltd. | Surface acoustic wave device |
US6788958B2 (en) | 2000-07-27 | 2004-09-07 | Murata Manufacturing Co., Ltd. | High-frequency module and mobile communication apparatus using the same |
JP2005287046A (en) * | 2004-03-30 | 2005-10-13 | Tdk Corp | Signal separating device and antenna switch module |
KR100616639B1 (en) | 2004-11-29 | 2006-08-28 | 삼성전기주식회사 | Apparatus for transmitting digital data using SAW filter |
US7138746B2 (en) | 2001-04-26 | 2006-11-21 | Murata Manufaturing Co., Ltd. | Surface acoustic wave apparatus and communication apparatus |
US7183878B2 (en) | 2003-08-25 | 2007-02-27 | Matsushita Electric Industrial Co., Ltd. | Surface acoustic wave filter |
EP1758247A2 (en) | 2005-08-25 | 2007-02-28 | Fujitsu Media Devices Limited | Duplexer having matching circuit |
JP2007074698A (en) * | 2005-08-08 | 2007-03-22 | Fujitsu Media Device Kk | Duplexer and ladder type filter |
JP2007336479A (en) * | 2006-06-19 | 2007-12-27 | Fujitsu Media Device Kk | Branching filter |
KR100795873B1 (en) | 2005-02-24 | 2008-01-21 | 쿄세라 코포레이션 | Surface acoustic wave device, duplexer, and communications equipment |
GB2441036A (en) * | 2006-08-17 | 2008-02-20 | Avago Technologies Wireless Ip | Matching acoustic wave filters |
EP1931054A1 (en) * | 2005-09-26 | 2008-06-11 | Murata Manufacturing Co., Ltd. | High-frequency front end module, and duplexer |
US7777592B2 (en) | 2006-03-24 | 2010-08-17 | Kabushiki Kaisha Toshiba | Antenna sharing device and portable telephone |
JP2013009411A (en) * | 2012-08-23 | 2013-01-10 | Taiyo Yuden Co Ltd | Antenna branching filter |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0269012A (en) * | 1988-09-05 | 1990-03-08 | Oki Electric Ind Co Ltd | Demultiplexer |
JPH0416014A (en) * | 1990-05-09 | 1992-01-21 | Murata Mfg Co Ltd | Surface acoustic wave device |
JPH05167388A (en) * | 1991-12-16 | 1993-07-02 | Fujitsu Ltd | Branching filter |
JPH0669750A (en) * | 1992-08-19 | 1994-03-11 | Fujitsu Ltd | Surface acoustic wave filter |
-
1997
- 1997-05-13 JP JP9121935A patent/JPH10313229A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0269012A (en) * | 1988-09-05 | 1990-03-08 | Oki Electric Ind Co Ltd | Demultiplexer |
JPH0416014A (en) * | 1990-05-09 | 1992-01-21 | Murata Mfg Co Ltd | Surface acoustic wave device |
JPH05167388A (en) * | 1991-12-16 | 1993-07-02 | Fujitsu Ltd | Branching filter |
JPH0669750A (en) * | 1992-08-19 | 1994-03-11 | Fujitsu Ltd | Surface acoustic wave filter |
Cited By (29)
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US7398103B2 (en) | 2000-07-27 | 2008-07-08 | Murata Manufacturing Co., Ltd. | High-frequency module and mobile communication apparatus using the same |
US6713940B2 (en) | 2001-01-10 | 2004-03-30 | Murata Manufacturing Co., Ltd. | Surface acoustic wave device |
US7138746B2 (en) | 2001-04-26 | 2006-11-21 | Murata Manufaturing Co., Ltd. | Surface acoustic wave apparatus and communication apparatus |
JP4495905B2 (en) * | 2001-12-13 | 2010-07-07 | アバゴ・テクノロジーズ・ワイヤレス・アイピー(シンガポール)プライベート・リミテッド | Filtering method by duplexer with differential receiving port |
JP2003209487A (en) * | 2001-12-13 | 2003-07-25 | Agilent Technol Inc | Filtering method using duplexer with differential receiver port |
GB2388727B (en) * | 2002-05-16 | 2004-05-26 | Murata Manufacturing Co | Surface acoustic wave duplexer and communication apparatus having the same |
US6943645B2 (en) | 2002-05-16 | 2005-09-13 | Murata Manufacturing Co., Ltd | Surface acoustic wave duplexer and communication apparatus having the same |
GB2388727A (en) * | 2002-05-16 | 2003-11-19 | Murata Manufacturing Co | Surface acoustic wave duplexer includes inductors |
US7183878B2 (en) | 2003-08-25 | 2007-02-27 | Matsushita Electric Industrial Co., Ltd. | Surface acoustic wave filter |
JP2005287046A (en) * | 2004-03-30 | 2005-10-13 | Tdk Corp | Signal separating device and antenna switch module |
KR100616639B1 (en) | 2004-11-29 | 2006-08-28 | 삼성전기주식회사 | Apparatus for transmitting digital data using SAW filter |
KR100795873B1 (en) | 2005-02-24 | 2008-01-21 | 쿄세라 코포레이션 | Surface acoustic wave device, duplexer, and communications equipment |
US7456705B2 (en) | 2005-02-24 | 2008-11-25 | Kyocera Corporation | Surface acoustic wave device, duplexer, and communications equipment |
JP2007074698A (en) * | 2005-08-08 | 2007-03-22 | Fujitsu Media Device Kk | Duplexer and ladder type filter |
US7573354B2 (en) | 2005-08-08 | 2009-08-11 | Fujitsu Media Devices Limited | Duplexer and ladder type filter |
EP1758247A2 (en) | 2005-08-25 | 2007-02-28 | Fujitsu Media Devices Limited | Duplexer having matching circuit |
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EP1931054A4 (en) * | 2005-09-26 | 2011-04-06 | Murata Manufacturing Co | High-frequency front end module, and duplexer |
US7777592B2 (en) | 2006-03-24 | 2010-08-17 | Kabushiki Kaisha Toshiba | Antenna sharing device and portable telephone |
US7755453B2 (en) | 2006-06-19 | 2010-07-13 | Fujitsu Media Devices Limited | Duplexer |
JP2007336479A (en) * | 2006-06-19 | 2007-12-27 | Fujitsu Media Device Kk | Branching filter |
US7501912B2 (en) | 2006-08-17 | 2009-03-10 | Avago Technologies Wireless Ip (Singapore) Pte. Ltd. | General matching network for acoustic wave filters and acoustic resonators |
GB2441036A (en) * | 2006-08-17 | 2008-02-20 | Avago Technologies Wireless Ip | Matching acoustic wave filters |
GB2441036B (en) * | 2006-08-17 | 2011-09-14 | Avago Technologies Wireless Ip | Matching acoustic wave filters |
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JP2013009411A (en) * | 2012-08-23 | 2013-01-10 | Taiyo Yuden Co Ltd | Antenna branching filter |
JP2018011280A (en) * | 2016-07-15 | 2018-01-18 | 株式会社村田製作所 | Multiplexer, high-frequency front end circuit and communication apparatus |
CN107623504A (en) * | 2016-07-15 | 2018-01-23 | 株式会社村田制作所 | Multiplexer, high-frequency front-end circuit and communicator |
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