JP2005184566A - 弾性表面波フィルタ - Google Patents
弾性表面波フィルタ Download PDFInfo
- Publication number
- JP2005184566A JP2005184566A JP2003423859A JP2003423859A JP2005184566A JP 2005184566 A JP2005184566 A JP 2005184566A JP 2003423859 A JP2003423859 A JP 2003423859A JP 2003423859 A JP2003423859 A JP 2003423859A JP 2005184566 A JP2005184566 A JP 2005184566A
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- JP
- Japan
- Prior art keywords
- acoustic wave
- surface acoustic
- resonators
- filter
- resonator
- 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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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
- H03H9/644—Coupled resonator filters having two acoustic tracks
- H03H9/6456—Coupled resonator filters having two acoustic tracks being electrically coupled
- H03H9/6469—Coupled resonator filters having two acoustic tracks being electrically coupled via two connecting electrodes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/0023—Balance-unbalance or balance-balance networks
- H03H9/0028—Balance-unbalance or balance-balance networks using surface acoustic wave devices
- H03H9/0047—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks
- H03H9/0052—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically cascaded
- H03H9/0061—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically cascaded the balanced terminals being on opposite sides of the tracks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02921—Measures for preventing electric discharge due to pyroelectricity
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
- H03H9/6483—Ladder SAW filters
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
【解決手段】 弾性表面波共振器S1、S2、P1〜P4を有する弾性表面波フィルタにおいて、信号入力端子12とこれに最も近いグランドG1との間、及び信号出力端子14とこれに最も近いグランドG3との間の少なくとも一方に、直列に接続された複数の弾性表面波共振器P1、P2;P4、P5が設けられ、当該複数の弾性表面波共振器の静電容量は略等しい(Cp1/Cp2=0.9〜1.1;Cp4/Cp5=0.9〜1.1)。
【選択図】 図1
Description
12 信号入力端子
14 信号出力端子
16 IDT電極
18、20 反射電極
30 DMSフィルタ
32 入力
34 出力
36 信号出力端子
S1〜S4 直列腕共振器
P1〜P5 並列腕共振器
Claims (8)
- 弾性表面波共振器を有する弾性表面波フィルタにおいて、信号入力端子とこれに最も近いグランドとの間、及び信号出力端子とこれに最も近いグランドとの間の少なくとも一方に、直列に接続された複数の弾性表面波共振器が設けられ、当該複数の弾性表面波共振器の静電容量は略等しいことを特徴とする弾性表面波フィルタ。
- 前記複数の弾性表面波共振器はいずれも、前記弾性表面波フィルタの並列腕に設けられていることを特徴とする請求項1記載の弾性表面波フィルタ。
- 前記複数の弾性表面波共振器はいずれも、前記弾性表面波フィルタの直列腕に設けられていることを特徴とする請求項1記載の弾性表面波フィルタ。
- 前記複数の弾性表面波共振器は、前記弾性表面波フィルタの直列腕に設けられた弾性表面波共振器と並列腕に設けられた弾性表面波共振器とを有することを特徴とする請求項1記載の弾性表面波フィルタ。
- 前記複数の弾性表面波共振器は、前記信号入力端子とこれに最も近いグランドとの間に設けられた第1の弾性表面波共振器群と、前記信号出力端子とこれに最も近いグランドとの間に設けられた第2の弾性表面波共振器群とを含み、
前記第1の弾性表面波共振器群は略等しい静電容量を持つ複数の弾性表面波共振器を有し、前記第2の弾性表面波共振器群は略等しい静電容量を持つ複数の弾性表面波共振器を有することを特徴とする請求項1記載の弾性表面波フィルタ。 - 前記弾性表面波フィルタはラダー型フィルタを含むことを特徴とする請求項1から5のいずれか一項記載の弾性表面波フィルタ。
- 前記弾性表面波フィルタは多重モード型フィルタを含むことを特徴とする請求項1から5のいずれか一項記載の弾性表面波フィルタ。
- 前記弾性表面波フィルタはバランス型の多重モード型フィルタを含み、前記直列に接続された複数の弾性表面波共振器は前記多重モード型フィルタのバランス端子にそれぞれ設けられていることを特徴とする請求項1から5のいずれか一項記載の弾性表面波フィルタ。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003423859A JP4230347B2 (ja) | 2003-12-19 | 2003-12-19 | 弾性表面波フィルタ |
EP04257848A EP1544997A3 (en) | 2003-12-19 | 2004-12-16 | Surface acoustic wave filter |
KR1020040107055A KR100724015B1 (ko) | 2003-12-19 | 2004-12-16 | 탄성 표면파 필터 |
US11/014,164 US7388456B2 (en) | 2003-12-19 | 2004-12-17 | Surface acoustic wave filter |
CNB2004101016893A CN100536329C (zh) | 2003-12-19 | 2004-12-20 | 表面声波滤波器 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003423859A JP4230347B2 (ja) | 2003-12-19 | 2003-12-19 | 弾性表面波フィルタ |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005184566A true JP2005184566A (ja) | 2005-07-07 |
JP4230347B2 JP4230347B2 (ja) | 2009-02-25 |
Family
ID=34510716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2003423859A Expired - Lifetime JP4230347B2 (ja) | 2003-12-19 | 2003-12-19 | 弾性表面波フィルタ |
Country Status (5)
Country | Link |
---|---|
US (1) | US7388456B2 (ja) |
EP (1) | EP1544997A3 (ja) |
JP (1) | JP4230347B2 (ja) |
KR (1) | KR100724015B1 (ja) |
CN (1) | CN100536329C (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010004686A1 (ja) * | 2008-07-10 | 2010-01-14 | 株式会社村田製作所 | 弾性波装置及びラダー型フィルタ装置 |
JP2012533252A (ja) * | 2009-07-13 | 2012-12-20 | エプコス アーゲー | Esd耐性を高めたsawフィルタ回路 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005020086B4 (de) * | 2005-04-29 | 2013-07-11 | Epcos Ag | Elektrisches Multiband-Bauelement |
DE102006057340B4 (de) * | 2006-12-05 | 2014-05-22 | Epcos Ag | DMS-Filter mit verbesserter Anpassung |
WO2010061496A1 (ja) * | 2008-11-25 | 2010-06-03 | 株式会社村田製作所 | 弾性波フィルタ装置 |
DE102014112676A1 (de) | 2014-09-03 | 2016-03-03 | Epcos Ag | Filter mit verbesserter Linearität |
CN115955212B (zh) * | 2023-03-14 | 2023-06-16 | 阿尔伯达(苏州)科技有限公司 | 一种扩大带宽的saw滤波器 |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2800905B2 (ja) * | 1991-10-28 | 1998-09-21 | 富士通株式会社 | 弾性表面波フィルタ |
JPH06224682A (ja) | 1993-01-22 | 1994-08-12 | Matsushita Electric Ind Co Ltd | 弾性表面波装置 |
JP3424971B2 (ja) * | 1994-01-20 | 2003-07-07 | 松下電器産業株式会社 | 弾性表面波フィルタ |
EP0757438B1 (en) * | 1995-07-25 | 2001-08-16 | Murata Manufacturing Co., Ltd. | Surface acoustic wave device |
FR2739232B1 (fr) * | 1995-09-26 | 1997-10-24 | Thomson Csf | Filtre a ondes acoustiques de surface utilisant le couplage de trois voies acoustiques |
JPH09205343A (ja) * | 1996-01-24 | 1997-08-05 | Murata Mfg Co Ltd | 弾性表面波フィルタ |
GB9622654D0 (en) * | 1996-10-31 | 1997-01-08 | Flowers James E | Filters |
US5949306A (en) * | 1997-12-02 | 1999-09-07 | Cts Corporation | Saw ladder filter with split resonators and method of providing same |
JPH11251871A (ja) * | 1998-03-06 | 1999-09-17 | Oki Electric Ind Co Ltd | 弾性表面波分波器の受信用フィルタ |
JP3206548B2 (ja) * | 1998-05-14 | 2001-09-10 | 株式会社村田製作所 | 表面波フィルタ、共用器、通信機装置 |
JP3563414B2 (ja) * | 1998-05-19 | 2004-09-08 | 松下電器産業株式会社 | Sawフィルタおよびそれを用いたアンテナ共用器およびそれを用いた移動体通信機 |
JP3255128B2 (ja) * | 1998-11-24 | 2002-02-12 | 株式会社村田製作所 | 弾性表面波フィルタ |
FR2788176B1 (fr) * | 1998-12-30 | 2001-05-25 | Thomson Csf | Dispositif a ondes acoustiques guidees dans une fine couche de materiau piezo-electrique collee par une colle moleculaire sur un substrat porteur et procede de fabrication |
US6262637B1 (en) * | 1999-06-02 | 2001-07-17 | Agilent Technologies, Inc. | Duplexer incorporating thin-film bulk acoustic resonators (FBARs) |
JP2000349591A (ja) * | 1999-06-08 | 2000-12-15 | Oki Electric Ind Co Ltd | 弾性表面波フィルタを用いた分波器 |
JP2001156588A (ja) * | 1999-11-26 | 2001-06-08 | Kyocera Corp | 弾性表面波装置 |
KR20010055046A (ko) * | 1999-12-09 | 2001-07-02 | 구자홍 | 표면 탄성파 필터 제조방법 |
GB0014963D0 (en) * | 2000-06-20 | 2000-08-09 | Koninkl Philips Electronics Nv | A bulk acoustic wave device |
DE10123369A1 (de) * | 2001-05-14 | 2002-12-05 | Infineon Technologies Ag | Filteranordnung für, symmetrische und unsymmetrische Leitungssysteme |
JP4030795B2 (ja) * | 2002-05-09 | 2008-01-09 | 日本電波工業株式会社 | 弾性表面波デバイス |
-
2003
- 2003-12-19 JP JP2003423859A patent/JP4230347B2/ja not_active Expired - Lifetime
-
2004
- 2004-12-16 EP EP04257848A patent/EP1544997A3/en not_active Withdrawn
- 2004-12-16 KR KR1020040107055A patent/KR100724015B1/ko not_active IP Right Cessation
- 2004-12-17 US US11/014,164 patent/US7388456B2/en active Active
- 2004-12-20 CN CNB2004101016893A patent/CN100536329C/zh active Active
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010004686A1 (ja) * | 2008-07-10 | 2010-01-14 | 株式会社村田製作所 | 弾性波装置及びラダー型フィルタ装置 |
US8188812B2 (en) | 2008-07-10 | 2012-05-29 | Murata Manufacturing Co., Ltd. | Elastic wave device and ladder filter device |
JP2013009408A (ja) * | 2008-07-10 | 2013-01-10 | Murata Mfg Co Ltd | ラダー型フィルタ装置 |
JP5141766B2 (ja) * | 2008-07-10 | 2013-02-13 | 株式会社村田製作所 | 弾性波装置及びラダー型フィルタ装置 |
JP2012533252A (ja) * | 2009-07-13 | 2012-12-20 | エプコス アーゲー | Esd耐性を高めたsawフィルタ回路 |
Also Published As
Publication number | Publication date |
---|---|
EP1544997A3 (en) | 2010-01-06 |
US20050151601A1 (en) | 2005-07-14 |
JP4230347B2 (ja) | 2009-02-25 |
KR100724015B1 (ko) | 2007-05-31 |
CN1630187A (zh) | 2005-06-22 |
EP1544997A2 (en) | 2005-06-22 |
US7388456B2 (en) | 2008-06-17 |
KR20050062402A (ko) | 2005-06-23 |
CN100536329C (zh) | 2009-09-02 |
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