JP2002319836A - Ladder type filter - Google Patents
Ladder type filterInfo
- Publication number
- JP2002319836A JP2002319836A JP2001125493A JP2001125493A JP2002319836A JP 2002319836 A JP2002319836 A JP 2002319836A JP 2001125493 A JP2001125493 A JP 2001125493A JP 2001125493 A JP2001125493 A JP 2001125493A JP 2002319836 A JP2002319836 A JP 2002319836A
- Authority
- JP
- Japan
- Prior art keywords
- resonance frequency
- resonator
- series
- parallel
- parallel resonance
- 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.)
- Pending
Links
- 230000001939 inductive effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
Landscapes
- Filters And Equalizers (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、水晶振動子あるい
は弾性表面波振動子などからなる共振器を用いたラダー
型フィルタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder-type filter using a resonator composed of a quartz oscillator or a surface acoustic wave oscillator.
【０００２】[0002]
【従来の技術】図５は従来のラダー型フィルタの構成を
示す。図５において、入力端１１と出力端１２との間の
シリーズアームには１以上の第一の共振器１３、１３、
・・が設けられ、また、シャントアームには１以上の第
二の共振器１４、１４、・・が設けられる。第一の共振
器１３と第二の共振器１４とはそれぞれ直列共振周波数
と並列共振周波数とを有し、第一の共振器１３において
は直列共振周波数ｆ1sよりも並列共振周波数ｆ1pの方が
高くなっており、同様に、第二の共振器１４において
も、直列共振周波数ｆ2sよりも並列共振周波数ｆ2pの方
が高くなっている。また、第一の共振器１３の直列共振
周波数ｆ1sと第二の共振器１４の並列共振周波数ｆ2pと
がほぼ等しくなっている。従って、これら共振器１３、
１４のインピーダンス特性は図６に示すようになる。2. Description of the Related Art FIG. 5 shows a configuration of a conventional ladder type filter. In FIG. 5, a series arm between an input terminal 11 and an output terminal 12 includes one or more first resonators 13, 13,.
Are provided, and the shunt arm is provided with one or more second resonators 14, 14,. The first resonator 13 and the second resonator 14 have a series resonance frequency and a parallel resonance frequency, respectively. In the first resonator 13, the parallel resonance frequency f 1p is higher than the series resonance frequency f 1s. Similarly, also in the second resonator 14, the parallel resonance frequency f 2p is higher than the series resonance frequency f 2s . Further, the series resonance frequency f 1s of the first resonator 13 and the parallel resonance frequency f 2p of the second resonator 14 are substantially equal. Therefore, these resonators 13,
The impedance characteristics of 14 are as shown in FIG.
【０００３】この結果、第一の入力端１１に信号を入力
したときの伝送特性は、図７に示すように第一の共振器
１３の並列共振周波数ｆ1pと第二の共振器１４の直列共
振周波数ｆ2sとで大きく減衰し、各共振周波数の間が通
過帯域となり、バンドパスフィルタが構成される。As a result, the transmission characteristics when a signal is input to the first input terminal 11 are, as shown in FIG. 7, the parallel resonance frequency f 1p of the first resonator 13 and the series resonance of the second resonator 14. It is greatly attenuated at the resonance frequency f 2s, and a pass band is formed between the resonance frequencies, thereby forming a band-pass filter.
【０００４】従って、通過帯域を広くするには各共振器
１３、１４の直列共振周波数と並列共振周波数との差
（Δ１＝ｆ1P−ｆ1S、Δ２＝ｆ2P−ｆ2S）を大きくする
か、又は第一の共振器１３の直列共振周波数ｆ1Sよりも
第二の共振器１４の並列共振周波数ｆ2Pを低くして、第
一の共振器１３の直列共振周波数ｆ1Sと第二の共振器１
４の並列共振周波数ｆ2Pとを離間させればよい。[0004] Therefore, whether to widen the pass band difference (Δ1 = f 1P -f 1S, Δ2 = f 2P -f 2S) between the parallel resonant frequency and the series resonant frequency of each resonator 13, 14 is increased Alternatively, the parallel resonance frequency f 2P of the second resonator 14 is made lower than the series resonance frequency f 1S of the first resonator 13 so that the series resonance frequency f 1S of the first resonator 13 and the second resonance frequency f 1S are reduced. Vessel 1
4 may be separated from the parallel resonance frequency f2P .
【０００５】[0005]
【発明が解決しようとする課題】しかし、各共振器にお
ける直列共振周波数と並列共振周波数との差は物理的な
寸法上の制約からあまり大きくは出来ず、また、第一の
共振器の直列共振周波数とそれよりも高い第二の共振器
の並列共振周波数との間を離間させると、通過帯域内の
伝送特性にリップルを生じるという問題がある。However, the difference between the series resonance frequency and the parallel resonance frequency in each resonator cannot be made too large due to physical dimensional restrictions, and the series resonance frequency of the first resonator cannot be increased. When the frequency is separated from the parallel resonance frequency of the second resonator which is higher than the frequency, there is a problem that a ripple occurs in transmission characteristics in a pass band.
【０００６】そこで、本発明のラダー型フィルタにおい
ては、各共振器の直列共振周波数と並列共振周波数との
差が大きく出来ない場合においても、通過帯域における
リップルがなく、通過帯域を広くすることが出来るよう
にすることを目的とする。Therefore, in the ladder-type filter of the present invention, even when the difference between the series resonance frequency and the parallel resonance frequency of each resonator cannot be made large, there is no ripple in the pass band and the pass band can be widened. The purpose is to be able to do it.
【０００７】[0007]
【課題を解決するための手段】上記の課題を解決する手
段として、第一の直列共振周波数とそれよりも高い第一
の並列共振周波数とを有し、シリーズアームに設けられ
た１以上の第一の共振器と、前記第一の直列共振周波数
よりも低い第二の直列共振周波数と前記第一の並列共振
周波数よりも低い第二の並列共振周波数を有し、シャン
トアームに設けられた１以上の第二の共振器とを備え、
前記第一の共振器に第一のインダクタンス素子を並列に
接続し、前記第二の共振器に第二のインダクタンス素子
を直列に介挿した。As a means for solving the above-mentioned problems, one or more first series resonance frequencies having a first series resonance frequency and a first parallel resonance frequency higher than the first series resonance frequency are provided. One resonator, a second series resonance frequency lower than the first series resonance frequency, and a second parallel resonance frequency lower than the first parallel resonance frequency; Comprising the above second resonator,
A first inductance element was connected in parallel to the first resonator, and a second inductance element was inserted in series in the second resonator.
【０００８】また、前記第一の直列共振周波数と前記第
二の並列共振周波数とをほぼ一致させた。Further, the first series resonance frequency and the second parallel resonance frequency are substantially matched.
【０００９】[0009]
【発明の実施の形態】以下、図１乃至図４を参照して本
発明のラダー型フィルタを説明する。先ず、図１におい
て、入力端１と出力端２との間のシリーズアームには１
以上の第一の共振器３、３、・・が設けられる。各第一
の共振器１３は互いに同一構成で同一の特性を有し、そ
の等価回路は図２に示すような直並列共振回路で示され
る。そして、直列共振周波数（第一の直列共振周波数）
ｆ1sよりも並列共振周波数（第一の並列共振周波数）ｆ
1pが高くなっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A ladder-type filter according to the present invention will be described below with reference to FIGS. First, in FIG. 1, a series arm between the input terminal 1 and the output terminal 2 has
The first resonators 3, 3,... Are provided. Each of the first resonators 13 has the same configuration and the same characteristics, and its equivalent circuit is represented by a series-parallel resonance circuit as shown in FIG. And the series resonance frequency (first series resonance frequency)
The parallel resonance frequency (first parallel resonance frequency) f than f 1s
1p is higher.
【００１０】また、シャントアームには１以上の第二の
共振器４、４、・・が設けられる。第二の共振器４も図
２の等価回路で示されると共に、各第二の共振器１４も
互いに同一構成で同一の特性を有し、直列共振周波数
（第二の直列共振周波数）ｆ2sよりも並列共振周波数
（第二の並列共振周波数）ｆ2pが高くなっている。ま
た、第一の共振器３の直列共振周波数ｆ1sと第二の共振
器４の並列共振周波数ｆ2pとがほぼ等しくなっている。
従って、これら共振器３、４のインピーダン特性はそれ
ぞれ図３の実線Ａ、Ｂで示すようになる。The shunt arm is provided with one or more second resonators 4, 4,... The second resonator 4 is also shown in the equivalent circuit of FIG. 2, and each of the second resonators 14 has the same configuration and the same characteristics as each other, and is obtained from the series resonance frequency (second series resonance frequency) f 2 s . Also, the parallel resonance frequency (second parallel resonance frequency) f 2p is high. Further, the series resonance frequency f 1s of the first resonator 3 and the parallel resonance frequency f 2p of the second resonator 4 are substantially equal.
Therefore, the impedance characteristics of these resonators 3 and 4 are as shown by solid lines A and B in FIG. 3, respectively.
【００１１】また、各第一の共振器３にはそれぞれ第一
のインダクタンス素子１５、１５、・・が並列に接続さ
れ、各第二の共振器１４にはそれぞれ第二のインダクタ
ンス素子１６、１６、・・が直列に介挿される。Each first resonator 3 is connected in parallel with a first inductance element 15, 15,..., And each second resonator 14 is connected with a second inductance element 16, 16 respectively. Are interposed in series.
【００１２】この結果、第一の共振器３と第一のインダ
クタンス素子５とによる直列共振周波数は変化しない
が、並列共振周波数は以前の第一の並列共振周波数ｆ1p
よりも高い方に移動し、その値はＦ1Pとなる。一方、第
二の共振器４と第二のインダクタンス素子６とによる並
列共振周波数は変化しないが、直列共振周波数は以前の
第二の直列共振周波数ｆ2sよりも低い方に移動し、その
値はＦ2Sとなる。この時のインピーダンス特性をそれぞ
れ図３の点線ａ、ｂで示す。As a result, the series resonance frequency of the first resonator 3 and the first inductance element 5 does not change, but the parallel resonance frequency changes to the previous first parallel resonance frequency f 1p.
Higher, and its value becomes F 1P . On the other hand, the parallel resonance frequency due to the second resonator 4 and the second inductance element 6 does not change, but the series resonance frequency moves to a lower value than the previous second series resonance frequency f 2s , and the value thereof is F2S . The impedance characteristics at this time are shown by dotted lines a and b in FIG. 3, respectively.
【００１３】従って、出力端２における伝送特性は、第
一の共振器３と第一のインダクタンス素子５とによる新
たな並列共振周波数はＦ1Pと、第二の共振器４と第二の
インダクタンス素子６とによる新たな直列共振周波数は
Ｆ2Sとにおいて減衰し、その間の周波数帯域を通過帯域
となり、通過帯域の広いバンドパスフィルタが構成され
る。Therefore, the transmission characteristic at the output terminal 2 is such that the new parallel resonance frequency of the first resonator 3 and the first inductance element 5 is F 1P , and the second resonator 4 and the second inductance element 5 6, the new series resonance frequency is attenuated at F2S, and the frequency band between them becomes a pass band, and a bandpass filter having a wide pass band is formed.
【００１４】ここで、第一の共振器３における第一の直
列共振周波数ｆ1sと第二の共振器４における第二の並列
共振周波数ｆ2pとをほぼ一致させておけば、中華帯域内
でのリップルが少なくなる。Here, if the first series resonance frequency f 1s in the first resonator 3 and the second parallel resonance frequency f 2p in the second resonator 4 are made to substantially coincide with each other, within the Chinese band, Less ripple.
【００１５】[0015]
【発明の効果】以上説明したように、本発明のラダー型
フィルタは、第一の直列共振周波数とそれよりも高い第
一の並列共振周波数とを有し、シリーズアームに設けら
れた１以上の第一の共振器と、第一の直列共振周波数よ
りも低い第二の直列共振周波数と第一の並列共振周波数
よりも低い第二の並列共振周波数を有し、シャントアー
ムに設けられた１以上の第二の共振器とを備え、第一の
共振器に第一のインダクタンス素子を並列に接続し、第
二の共振器に第二のインダクタンス素子を直列に介挿し
たので、各共振器自体の特性を変えることなく簡単に通
過帯域を広げることが出来る。As described above, the ladder-type filter of the present invention has a first series resonance frequency and a first parallel resonance frequency higher than the first series resonance frequency, and has at least one series resonance frequency provided on the series arm. A first resonator having a second series resonance frequency lower than the first series resonance frequency and a second parallel resonance frequency lower than the first parallel resonance frequency, and one or more provided on the shunt arm The first resonator is connected in parallel to the first resonator, and the second inductor is inserted in series with the second resonator. The passband can be easily widened without changing the characteristics of.
【００１６】また、第一の直列共振周波数と第二の並列
共振周波数とをほぼ一致させたので、通過帯域における
リップルが少ないフィルタを構成出来る。Further, since the first series resonance frequency and the second parallel resonance frequency are substantially matched, a filter with little ripple in the pass band can be constructed.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明のラダー型フィルタの構成を示す回路図
である。FIG. 1 is a circuit diagram showing a configuration of a ladder-type filter of the present invention.
【図２】本発明のラダー型フィルタに使用する共振器の
等価回路図である。FIG. 2 is an equivalent circuit diagram of a resonator used in the ladder-type filter of the present invention.
【図３】本発明のラダー型フィルタにおける共振器のイ
ンピーダンス特性図である。FIG. 3 is an impedance characteristic diagram of a resonator in the ladder-type filter of the present invention.
【図４】本発明のラダー型フィルタの伝送特性図であ
る。FIG. 4 is a transmission characteristic diagram of the ladder-type filter of the present invention.
【図５】従来のラダー型フィルタの構成を示す回路図で
ある。FIG. 5 is a circuit diagram showing a configuration of a conventional ladder-type filter.
【図６】従来のラダー型フィルタにおけるインピーダン
ス特性図である。FIG. 6 is an impedance characteristic diagram of a conventional ladder filter.
【図７】従来のラダー型フィルタの伝送特性図である。FIG. 7 is a transmission characteristic diagram of a conventional ladder-type filter.
１ 入力端 ２ 出力端 ３ 第一の共振器 ４ 第二の共振器 ５ 第一のインダクタンス素子 ６ 第二のインダクタンス素子 ｆ1s 第一の共振器の直列共振周波数（第一の直列共振
周波数） ｆ1p 第一の共振器の並列共振周波数（第一の並列共振
周波数） Ｆ1P 第一の共振器と第一のインダクタンス素子とによ
る並列共振周波数（新たな並列共振周波数） ｆ2s 第二の共振器の直列共振周波数 ｆ2p 第二の共振器の並列共振周波数 Ｆ2S 第二の共振器と第二のインダクタンス素子とによ
る直列共振周波数（新たな直列共振周波数） Reference Signs List 1 input terminal 2 output terminal 3 first resonator 4 second resonator 5 first inductance element 6 second inductance element f 1s series resonance frequency of first resonator (first series resonance frequency) f 1p Parallel resonance frequency of first resonator (first parallel resonance frequency) F 1P Parallel resonance frequency of first resonator and first inductance element (new parallel resonance frequency) f 2s Second resonator Series resonance frequency f 2p parallel resonance frequency of the second resonator F 2S series resonance frequency of the second resonator and the second inductance element (new series resonance frequency)
Claims (2)
第一の並列共振周波数とを有し、シリーズアームに設け
られた１以上の第一の共振器と、前記第一の直列共振周
波数よりも低い第二の直列共振周波数と前記第一の並列
共振周波数よりも低い第二の並列共振周波数を有し、シ
ャントアームに設けられた１以上の第二の共振器とを備
え、前記第一の共振器に第一のインダクタンス素子を並
列に接続し、前記第二の共振器に第二のインダクタンス
素子を直列に介挿したことを特徴とするラダー型フィル
タ。A first series resonance frequency having a first series resonance frequency and a first parallel resonance frequency higher than the first series resonance frequency, wherein the at least one first resonator is provided in a series arm; A second parallel resonance frequency lower than the second parallel resonance frequency and a second parallel resonance frequency lower than the first parallel resonance frequency, and includes one or more second resonators provided on a shunt arm; A ladder filter, wherein a first inductance element is connected in parallel to one resonator, and a second inductance element is inserted in series in the second resonator.
並列共振周波数とをほぼ一致させたことを特徴とする請
求項１に記載のラダー型フィルタ。2. The ladder-type filter according to claim 1, wherein the first series resonance frequency and the second parallel resonance frequency are substantially matched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001125493A JP2002319836A (en) | 2001-04-24 | 2001-04-24 | Ladder type filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001125493A JP2002319836A (en) | 2001-04-24 | 2001-04-24 | Ladder type filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002319836A true JP2002319836A (en) | 2002-10-31 |
Family
ID=18974707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001125493A Pending JP2002319836A (en) | 2001-04-24 | 2001-04-24 | Ladder type filter |
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| Country | Link |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003069382A (en) * | 2001-08-27 | 2003-03-07 | Matsushita Electric Ind Co Ltd | Surface acoustic wave filter and antenna duplexer using it |
| US6862441B2 (en) * | 2003-06-09 | 2005-03-01 | Nokia Corporation | Transmitter filter arrangement for multiband mobile phone |
| US6909338B2 (en) * | 2002-10-30 | 2005-06-21 | Murta Manufacturing Co., Ltd. | Ladder-type filter, branching filter, and communication device |
| JP2007074698A (en) * | 2005-08-08 | 2007-03-22 | Fujitsu Media Device Kk | Duplexer and ladder filter |
| KR100790278B1 (en) | 2005-08-25 | 2008-01-02 | 후지쓰 메디아 데바이스 가부시키가이샤 | Filter and antenna splitter |
| JP2008011151A (en) * | 2006-06-29 | 2008-01-17 | Kyocera Kinseki Corp | Bandpass filter |
| JP2010206843A (en) * | 2010-06-10 | 2010-09-16 | Fujitsu Media Device Kk | Filter and antenna branching filter |
| WO2016013659A1 (en) * | 2014-07-25 | 2016-01-28 | 株式会社村田製作所 | Bandpass filter and filter module |
| WO2024001157A1 (en) * | 2022-06-29 | 2024-01-04 | 河源市艾佛光通科技有限公司 | Fbar filter and multi-ladder filter |
-
2001
- 2001-04-24 JP JP2001125493A patent/JP2002319836A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003069382A (en) * | 2001-08-27 | 2003-03-07 | Matsushita Electric Ind Co Ltd | Surface acoustic wave filter and antenna duplexer using it |
| US6909338B2 (en) * | 2002-10-30 | 2005-06-21 | Murta Manufacturing Co., Ltd. | Ladder-type filter, branching filter, and communication device |
| US6862441B2 (en) * | 2003-06-09 | 2005-03-01 | Nokia Corporation | Transmitter filter arrangement for multiband mobile phone |
| JP2007074698A (en) * | 2005-08-08 | 2007-03-22 | Fujitsu Media Device Kk | Duplexer and ladder filter |
| EP1755217A3 (en) * | 2005-08-08 | 2014-02-26 | Taiyo Yuden Co., Ltd. | Duplexer and ladder type filter |
| KR100790278B1 (en) | 2005-08-25 | 2008-01-02 | 후지쓰 메디아 데바이스 가부시키가이샤 | Filter and antenna splitter |
| JP2008011151A (en) * | 2006-06-29 | 2008-01-17 | Kyocera Kinseki Corp | Bandpass filter |
| JP2010206843A (en) * | 2010-06-10 | 2010-09-16 | Fujitsu Media Device Kk | Filter and antenna branching filter |
| WO2016013659A1 (en) * | 2014-07-25 | 2016-01-28 | 株式会社村田製作所 | Bandpass filter and filter module |
| JPWO2016013659A1 (en) * | 2014-07-25 | 2017-06-01 | 株式会社村田製作所 | Bandpass filters and filter modules |
| US10340887B2 (en) | 2014-07-25 | 2019-07-02 | Murata Manufacturing Co., Ltd. | Band pass filter and filter module |
| WO2024001157A1 (en) * | 2022-06-29 | 2024-01-04 | 河源市艾佛光通科技有限公司 | Fbar filter and multi-ladder filter |
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