JPS56149814A - Elastic surface wave filter - Google Patents
Elastic surface wave filterInfo
- Publication number
- JPS56149814A JPS56149814A JP5298280A JP5298280A JPS56149814A JP S56149814 A JPS56149814 A JP S56149814A JP 5298280 A JP5298280 A JP 5298280A JP 5298280 A JP5298280 A JP 5298280A JP S56149814 A JPS56149814 A JP S56149814A
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- thickness
- electrode
- unnecessary volume
- volume wave
- 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
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
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02866—Means for compensation or elimination of undesirable effects of bulk wave excitation and reflections
-
- 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
- H03H9/02614—Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves
- H03H9/02622—Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves of the surface, including back surface
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
PURPOSE:To suppress an unnecessary volume wave signal so that a satisfactory selectivity characteristics can be obtained, by changing the thickness of the piezoelectric substrate of the input electrode part and the output electrode part. CONSTITUTION:The thickness of the piezoelectric substrate 1 on which the input electrode 2 is provided is made into the thick part 1a, and also the thickness of the substrate on which the output electrode is provided is made into the thin part 1b. In this constitution, an elastic surface wave which has been generated by the electrode provided on the thick part 1a is converted to an electric signal by the electrode 3 provided on the thin part 1b. In this case, since the thickness of the substrate 1 is varied with the position of the electrodes 2, 3, the resonance frequency which generates an unnecessary volume wave response is varied, and generation of an unnecessary volume wave is suppressed. The substrate 1 is formed with lithium niobate of 127.8 degree rotary Y cut, the thick part 1a and the thin part 1b are made 600mum and 300mum, respectively, and the width of electrodes 2, 3 is made 15mum. When it is compared with the substrate 1 whose thickness is uniform, the suppression effect of an unnecessary volume wave is about 10dB.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5298280A JPS56149814A (en) | 1980-04-23 | 1980-04-23 | Elastic surface wave filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5298280A JPS56149814A (en) | 1980-04-23 | 1980-04-23 | Elastic surface wave filter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56149814A true JPS56149814A (en) | 1981-11-19 |
Family
ID=12930104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5298280A Pending JPS56149814A (en) | 1980-04-23 | 1980-04-23 | Elastic surface wave filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56149814A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1734654A1 (en) * | 2004-04-08 | 2006-12-20 | Murata Manufacturing Co., Ltd. | Surface acoustic wave filter and manufacturing method thereof |
-
1980
- 1980-04-23 JP JP5298280A patent/JPS56149814A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1734654A1 (en) * | 2004-04-08 | 2006-12-20 | Murata Manufacturing Co., Ltd. | Surface acoustic wave filter and manufacturing method thereof |
EP1734654A4 (en) * | 2004-04-08 | 2009-12-23 | Murata Manufacturing Co | Surface acoustic wave filter and manufacturing method thereof |
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