WO2005004327A1 - 弾性表面波フィルタとそれを用いたデバイス - Google Patents
弾性表面波フィルタとそれを用いたデバイス Download PDFInfo
- Publication number
- WO2005004327A1 WO2005004327A1 PCT/JP2004/008280 JP2004008280W WO2005004327A1 WO 2005004327 A1 WO2005004327 A1 WO 2005004327A1 JP 2004008280 W JP2004008280 W JP 2004008280W WO 2005004327 A1 WO2005004327 A1 WO 2005004327A1
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- WO
- WIPO (PCT)
- Prior art keywords
- saw
- resonator
- series
- capacitance
- connection point
- Prior art date
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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
- H03H9/6483—Ladder SAW filters
Definitions
- the present invention relates to a surface acoustic wave filter used for communication equipment and an electronic device using the same.
- FIG. 15 shows a conventional ladder-type surface acoustic wave (SAW) filter 1001 disclosed in Japanese Patent Application Laid-Open No. 6-152173.
- SAW surface acoustic wave
- the characteristics of the SAW fill 1001 are shown by the line 202 in FIGS. As shown by the line 202, the SAW filter 1001 has an attenuation band on both sides of the passband. Filters such as the S AW filter 1001 are required to have a characteristic in which the loss in the pass band is small and the band shifts sharply to the attenuation band. Disclosure of the invention
- the surface acoustic wave (SAW) filter is composed of a first SAW resonator, a second SAW resonator connected in series with the first SAW resonator at a first connection point, and a second SAW resonator.
- a third SAW resonator connected in series with the S AW resonator at a second connection point, and a third S AW resonator
- a fourth SAW resonator connected in series with the third node at the third connection point, a fifth SAW resonator oscillated between the first connection point and ground, and a third connection
- a sixth SAW resonator connected between the point and the ground; and a first capacitance component forming a capacitance, connected between the second connection point and the ground.
- This S AW filter has a steep attenuation characteristic on the high band side of the pass band, so that the pass band is wide and the loss in the pass band is small.
- FIG. 1 is a circuit diagram of a surface acoustic wave (S AW) filter according to an embodiment of the present invention.
- S AW surface acoustic wave
- FIG. 2 is a frequency characteristic diagram of the SAW filter according to the embodiment.
- FIG. 3 is a frequency characteristic diagram of the SAW filter according to the embodiment.
- FIG. 4 is a cross-sectional view of the SAW file according to the embodiment.
- FIG. 5j Equivalent circuit according to the embodiment.
- FIG. 6 is an equivalent circuit diagram of the SAW filter according to the embodiment.
- FIG. 7 is a plan view of the SAW file according to the embodiment.
- FIG. 8 is a plan view of a capacitance structure of the SAW filter according to the embodiment.
- FIG. 9 is a plan view of another capacitance structure of the SAW filter according to the embodiment.
- FIG. 10 is a plan view of still another capacitance structure of the SAW filter according to the embodiment.
- FIG. 11 is a plan view of another SAW file according to the embodiment.
- FIG. 12 is a plan view of yet another SAW file according to the embodiment.
- FIG. 13 is a circuit diagram of still another SAW filter according to the embodiment. .
- FIG. 14 is a block diagram of a device using the SAW file according to the embodiment.
- FIG. 15 is a circuit diagram of a conventional SAW filter. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a circuit diagram of a surface acoustic wave (SAW) filter 101 according to an embodiment of the present invention.
- SAW surface acoustic wave
- series resonators 3 to 6 are connected in this order from the input terminal 1 to the output terminal 2.
- One end of the parallel resonator 7 is connected between the series resonator 3 and the series resonator 4.
- One end of the parallel resonator 8 is connected between the series resonator 5 and the series resonator 6.
- the other end of the parallel resonator 7 is connected to the ground via an inductance component 9 forming an inductance.
- the other end of the parallel resonator 8 is connected to Durand via an inductance component 10 forming an inductance.
- a capacitance structure 11 that forms a capacitance between the series resonator 4 and the series resonator 5 and between the series resonators and the land is connected.
- the SAW filter 101 according to the embodiment is a conventional SAW filter 1001 (line 202) shown in FIG. 15 in the pass band from 192 GHz to 1.98 GHz. ) Less loss. Further, the filter 101 has greater attenuation on both sides of the passband than the conventional SAW filter 1001 (line 202), and has a steeper attenuation characteristic than the SAW filter 1001 (line 202). Therefore, the SAW filter 101 according to the embodiment has a wider band and lower loss than the conventional SAW filter 101.
- FIG. 4 is a cross-sectional view of the SAW filter 101 according to the embodiment.
- the inductance components 9 and 10 are formed of wires connected to the piezoelectric substrate 51 on which the resonators 3 to 8 are formed.
- FIG. 5 is a partial equivalent circuit of the SAW filter 101 shown in FIG.
- the parallel resonance of the series resonators 3 to 6 itself greatly contributes to the attenuation on the higher side of the pass band of the SAW filter 101.
- the series resonance of the parallel resonators 7 and 8 itself greatly contributes to the attenuation on the lower side of the pass band of the SAW filter 101.
- the characteristics of the SAW filter 101 in the pass band The series resonance of the series resonators 3 to 6 itself and the parallel resonance of the parallel resonators 7 and 8 themselves greatly contribute. Conventionally, attenuation characteristics are designed by adjusting these resonators. The ratio between the series resonance and the parallel resonance of these resonators is almost determined by the conditions of the piezoelectric substrate on which these resonators are formed.
- Fig. 6 shows the equivalent circuit of the equivalent circuit shown in the figure at frequencies near the high-frequency attenuation pole of the SAW filter 101.
- the series resonators 4 and 5 become parallel resonance circuits 12 and 13, respectively, and the parallel resonators 7 and 8 become capacitors 14 and 15, respectively. Therefore, the equivalent circuit shown in FIG. 6 including the capacitance construct 11 can be approximated to an elliptic function bandpass filter at frequencies near the high-frequency attenuation pole.
- a sharp attenuation characteristic is obtained while maintaining the high-frequency attenuation, so that the S AW filter 101 has a low-loss filter with a wide pass band as shown by the line 201 in FIG. Become.
- the capacitance structure 11 can be formed on a piezoelectric substrate in the same manner as the series resonators 3 to 6 and the parallel resonators 7 and 8. Hereinafter, the method will be described.
- FIG. 7 is a plan view of the SAW filter 101 according to the embodiment.
- an input terminal 1 On a piezoelectric substrate 51, an input terminal 1, an output terminal 2, series resonators 3 to 6, parallel resonators 7, 8, ground electrodes 16 to 18, and a capacitance component 11 are formed.
- the capacitance component 11 is formed by an interdigital electrode 141, which protrudes from the connection point 52 of the series resonator 4 and the series resonator 5 and the ground electrode 18 and faces each other. .
- FIG. 8 to 10 are plan views of other capacitance components 11 1 to 11 13.
- the portions 11 1 C and 11 ID protruding from the long sides are opposed to each other.
- lines 112C and 112D protruding from electrodes 112A and 112B extending from the connection point 52 between the series resonator 4 and the series resonator 5 and the ground electrode 18 are parallel to each other. And are opposed to each other.
- the concave and convex portions 113C and 113C are provided at opposing portions of the electrodes 113A and 113B extending from the connection point 52 between the series resonators 4 and 5 and the ground electrode 18, respectively.
- 113D is provided.
- FIG. 11 is a plan view of another SAW filter 102 according to the embodiment.
- the orientation of the interdigital electrodes 142 forming the capacitance structure 11 is different from the interdigital electrode 11 forming the capacitance structure 11 shown in FIG. 10, and the series resonators 3, 4, 5 , 6 and the parallel resonators 7, 8 'are rotated 90 degrees.
- the index and interval of the digital electrodes 141 and 12 are set by their capacitance.
- the direction of the in-digital electrode 142 shown in FIG. 11 is different from the direction of the inter-digital electrode of each resonator by 90 °. The vibration of each resonator does not affect the capacitance component 11 regardless of the capacitance of the capacitance component 11.
- FIG. 12 is a plan view of still another SAW file 103 according to the embodiment.
- Ground electrodes 16 to 18 and a ground electrode 40 surrounding each element of the SAW filter 103 are connected on a piezoelectric substrate 51.
- the ground electrode 40 functions as a force when dividing a piezoelectric substrate wafer on which a plurality of SAW filters are formed into individual SAW filters. Has been removed and does not affect the characteristics of SAW Phil 40.
- FIG. 13 is a circuit diagram of the SAW filter 104 according to the embodiment.
- the capacitance structure 19 Is provided between the connection point 61 between the series resonators 3 and 4 and the ground.
- a capacitance structure 20 is provided between a connection point 62 between the series resonator 5 and the series resonator 6 and the ground.
- the capacitance components 19 and 20 can be formed with the same structure as the capacitance component 11 shown in FIGS. FIG.
- FIG. 14 is a block diagram of a device including the SAW filters 101 to 104 according to the embodiment and other elements such as the antenna 41 and the amplifiers 43 and 44.
- a duplexer 42 using a SAW filter connected to an antenna 41 is connected to a power amplifier 43 on the transmitting side and an amplifier 44 on the receiving side.
- the device shown in FIG. 14 may be a mobile phone having a shared device 42 and a secondary battery 145 that supplies power to the amplifiers 43 and 44.
- the effect of reducing the loss in the pass band of the SAW filter by 0.1 dB when the battery capacity W of the battery 145 is, for example, 58 OmAh will be described in detail.
- the voltage of the battery 145 is V (V)
- the current consumption is I (A)
- the output power of the radio wave from the antenna 41 is Pout (dBm).
- the surface acoustic wave (SAW) filter according to the present invention has a steep attenuation at the higher side of the pass band. It has the characteristic that the pass band is widened and the loss in the pass band is small.
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04736352A EP1646146A4 (en) | 2003-07-07 | 2004-06-08 | SURFACE WAVE FILTER AND DEVICE USING SUCH A FILTER |
US10/517,827 US7286028B2 (en) | 2003-07-07 | 2004-06-08 | Surface acoustic wave filter and device employing it |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-192653 | 2003-07-07 | ||
JP2003192653A JP2005033246A (ja) | 2003-07-07 | 2003-07-07 | Sawフィルタとそれを用いた電子デバイス |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005004327A1 true WO2005004327A1 (ja) | 2005-01-13 |
Family
ID=33562416
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/008280 WO2005004327A1 (ja) | 2003-07-07 | 2004-06-08 | 弾性表面波フィルタとそれを用いたデバイス |
Country Status (4)
Country | Link |
---|---|
US (1) | US7286028B2 (ja) |
EP (1) | EP1646146A4 (ja) |
JP (1) | JP2005033246A (ja) |
WO (1) | WO2005004327A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006123518A1 (ja) | 2005-05-16 | 2006-11-23 | Murata Manufacturing Co., Ltd. | 弾性境界波装置 |
US8179211B2 (en) * | 2005-07-08 | 2012-05-15 | Epcos Ag | RF-filter with improved adjacent channel suppression |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4202245B2 (ja) * | 2003-12-24 | 2008-12-24 | 富士通メディアデバイス株式会社 | 弾性表面波フィルタ |
JP2008109413A (ja) * | 2006-10-25 | 2008-05-08 | Fujitsu Media Device Kk | 弾性波デバイスおよびフィルタ |
JP5240793B2 (ja) * | 2009-03-09 | 2013-07-17 | 日本電波工業株式会社 | デュプレクサ |
WO2011093449A1 (ja) * | 2010-01-28 | 2011-08-04 | 株式会社村田製作所 | チューナブルフィルタ |
DE112011100580B4 (de) * | 2010-05-13 | 2017-02-09 | Murata Manufacturing Co., Ltd. | Vorrichtung für elastische Wellen |
EP2773039A4 (en) * | 2011-10-24 | 2015-07-08 | Murata Manufacturing Co | ELASTIC WAVE DEMULTIPLEXER |
JP5955095B2 (ja) * | 2012-05-22 | 2016-07-20 | スカイワークス・パナソニック フィルターソリューションズ ジャパン株式会社 | 弾性波装置 |
DE102018125498B4 (de) * | 2018-10-15 | 2020-04-23 | RF360 Europe GmbH | Elektroakustisches HF-Filter mit verbesserter Leistung und Multiplexer-Komponente, die ein HF-Filter umfasst |
CN111431505B (zh) * | 2020-04-07 | 2021-01-05 | 诺思(天津)微系统有限责任公司 | 滤波器和多工器以及通信设备 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH10190406A (ja) * | 1996-10-21 | 1998-07-21 | Matsushita Electric Ind Co Ltd | 高周波弾性表面波フィルタとその製造方法 |
WO2000030252A1 (fr) * | 1998-11-13 | 2000-05-25 | Matsushita Electric Industrial Co., Ltd. | Filtre d'ondes acoustiques de surface |
JP2002330055A (ja) * | 2001-04-27 | 2002-11-15 | Tdk Corp | 表面弾性波フィルタ、表面弾性波フィルタ用パッケージ及び表面弾性波フィルタモジュール |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2800905B2 (ja) * | 1991-10-28 | 1998-09-21 | 富士通株式会社 | 弾性表面波フィルタ |
JP3201017B2 (ja) | 1992-11-13 | 2001-08-20 | 株式会社村田製作所 | 梯子型弾性表面波フィルタ |
JP2905094B2 (ja) * | 1994-07-01 | 1999-06-14 | 富士通株式会社 | 分波器パッケージ |
JP3390537B2 (ja) * | 1994-08-22 | 2003-03-24 | 富士通株式会社 | 弾性表面波フィルタ |
DE69625734T2 (de) * | 1995-03-15 | 2003-05-22 | Matsushita Electric Industrial Co., Ltd. | Akustischer Oberflächenwellenfilter |
DE69608997T2 (de) * | 1995-04-12 | 2000-11-16 | Matsushita Electric Industrial Co., Ltd. | Resonateur-Kettenfilter mit akustischen Oberflächenwellen |
GB2312110B (en) * | 1996-03-29 | 2000-07-05 | Advanced Saw Prod Sa | Acoustic wave filter |
GB2312109B (en) * | 1996-03-29 | 2000-08-02 | Advanced Saw Prod Sa | Acoustic wave filter |
JPH1013187A (ja) * | 1996-06-19 | 1998-01-16 | Oki Electric Ind Co Ltd | はしご型フィルタ |
US6107899A (en) | 1996-10-21 | 2000-08-22 | Matsushita Electric Industrial Co., Ltd. | Surface acoustic wave filter with grounds not connected in the package or on the piezoelectric substrate |
JP3401408B2 (ja) * | 1997-07-22 | 2003-04-28 | 沖電気工業株式会社 | 弾性表面波フィルタ |
US5933062A (en) * | 1997-11-04 | 1999-08-03 | Motorola Inc. | Acoustic wave ladder filter with effectively increased coupling coefficient and method of providing same |
JP3792409B2 (ja) * | 1998-10-05 | 2006-07-05 | 京セラ株式会社 | 弾性表面波フィルタ |
JP3498204B2 (ja) * | 1999-03-10 | 2004-02-16 | 株式会社村田製作所 | 弾性表面波フィルタ、それを用いた通信機装置 |
JP3403669B2 (ja) * | 1999-06-04 | 2003-05-06 | 富士通株式会社 | アンテナ分波器 |
US6593678B1 (en) * | 2000-10-24 | 2003-07-15 | Clarisay, Inc. | Surface acoustic wave filter having diminished bandwidth and method of operating the same |
-
2003
- 2003-07-07 JP JP2003192653A patent/JP2005033246A/ja active Pending
-
2004
- 2004-06-08 EP EP04736352A patent/EP1646146A4/en not_active Withdrawn
- 2004-06-08 WO PCT/JP2004/008280 patent/WO2005004327A1/ja not_active Application Discontinuation
- 2004-06-08 US US10/517,827 patent/US7286028B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH10190406A (ja) * | 1996-10-21 | 1998-07-21 | Matsushita Electric Ind Co Ltd | 高周波弾性表面波フィルタとその製造方法 |
WO2000030252A1 (fr) * | 1998-11-13 | 2000-05-25 | Matsushita Electric Industrial Co., Ltd. | Filtre d'ondes acoustiques de surface |
JP2002330055A (ja) * | 2001-04-27 | 2002-11-15 | Tdk Corp | 表面弾性波フィルタ、表面弾性波フィルタ用パッケージ及び表面弾性波フィルタモジュール |
Non-Patent Citations (1)
Title |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006123518A1 (ja) | 2005-05-16 | 2006-11-23 | Murata Manufacturing Co., Ltd. | 弾性境界波装置 |
EP1883157A1 (en) * | 2005-05-16 | 2008-01-30 | Murata Manufacturing Co., Ltd. | Boundary acoustic wave device |
EP1883157A4 (en) * | 2005-05-16 | 2008-10-08 | Murata Manufacturing Co | RAND SOUND WAVE DEVICE |
US8179211B2 (en) * | 2005-07-08 | 2012-05-15 | Epcos Ag | RF-filter with improved adjacent channel suppression |
Also Published As
Publication number | Publication date |
---|---|
US7286028B2 (en) | 2007-10-23 |
EP1646146A1 (en) | 2006-04-12 |
EP1646146A4 (en) | 2008-04-23 |
JP2005033246A (ja) | 2005-02-03 |
US20050231306A1 (en) | 2005-10-20 |
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