JPS56149814A - Elastic surface wave filter - Google Patents

Elastic surface wave filter

Info

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
Application number
JP5298280A
Other languages
Japanese (ja)
Inventor
Hideo Abe
Jun Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5298280A priority Critical patent/JPS56149814A/en
Publication of JPS56149814A publication Critical patent/JPS56149814A/en
Pending legal-status Critical Current

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.
JP5298280A 1980-04-23 1980-04-23 Elastic surface wave filter Pending JPS56149814A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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