JPS57208719A - Surface acoustic wave device - Google Patents

Surface acoustic wave device

Info

Publication number
JPS57208719A
JPS57208719A JP9386581A JP9386581A JPS57208719A JP S57208719 A JPS57208719 A JP S57208719A JP 9386581 A JP9386581 A JP 9386581A JP 9386581 A JP9386581 A JP 9386581A JP S57208719 A JPS57208719 A JP S57208719A
Authority
JP
Japan
Prior art keywords
surface acoustic
acoustic waves
piezoelectric substrate
electric signal
comb type
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
JP9386581A
Other languages
Japanese (ja)
Inventor
Seiji Kishimoto
Jun Yamada
Takeshi Hazama
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 JP9386581A priority Critical patent/JPS57208719A/en
Publication of JPS57208719A publication Critical patent/JPS57208719A/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
    • H03H9/02842—Means for compensation or elimination of undesirable effects of 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
    • H03H9/02818—Means for compensation or elimination of undesirable effects
    • H03H9/02881—Means for compensation or elimination of undesirable effects of diffraction of wave beam

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

PURPOSE:To decrease the dispersion in reflecting characteristics and to make a titled device small-sized, by providing a reflector consistuted with a material in which the full reflection critical angle is <=45 deg., to a transmission path of surface acoustic waves on a piezoelectric substrate. CONSTITUTION:An input electrode 2 and an output electrode 4 are arranged on a piezoelectric substrate 3 and comb type converters 21 and 41 are connected respectively. An electric signal is given to an input electrode 2 from an input terminal 1, the conversion between the electric signal and the surface acoustic waves is made at the comb type converter 21, the surface acoustic waves propagate on the piezoelectric substrate 3 and are converted into an electric signal at the comb type converter 41 and outputted from an output terminal 5. On the path of surface acoustic waves, a reflector 7 constituted with a material in which sound velocity is different from that on the piezoelectric substrate and the full reflection critical angle is <=45 deg. is arranged so tht the reflecting end is a linear ridge end of 45 deg. with respect to the propagation direction of surface acoustic waves, and the surface acoustic waves of the incident angle of 45 deg. can fully be reflected.
JP9386581A 1981-06-19 1981-06-19 Surface acoustic wave device Pending JPS57208719A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9386581A JPS57208719A (en) 1981-06-19 1981-06-19 Surface acoustic wave device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9386581A JPS57208719A (en) 1981-06-19 1981-06-19 Surface acoustic wave device

Publications (1)

Publication Number Publication Date
JPS57208719A true JPS57208719A (en) 1982-12-21

Family

ID=14094334

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9386581A Pending JPS57208719A (en) 1981-06-19 1981-06-19 Surface acoustic wave device

Country Status (1)

Country Link
JP (1) JPS57208719A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60259010A (en) * 1984-06-06 1985-12-21 Toshiba Corp Elastic surface wave resonator
US5414321A (en) * 1991-03-28 1995-05-09 Siemens Aktiengesellschaft Surface-wave arrangement having a structure for preventing interfering acoustic wave components
WO2000057548A1 (en) * 1999-03-24 2000-09-28 Fujitsu Limited Surface acoustic wave filter
US6650207B1 (en) * 2000-04-24 2003-11-18 Mitsubishi Denki Kabushiki Kaisha Longitudinally coupled surface acoustic wave filter with linearly weighted reflectors

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60259010A (en) * 1984-06-06 1985-12-21 Toshiba Corp Elastic surface wave resonator
US5414321A (en) * 1991-03-28 1995-05-09 Siemens Aktiengesellschaft Surface-wave arrangement having a structure for preventing interfering acoustic wave components
WO2000057548A1 (en) * 1999-03-24 2000-09-28 Fujitsu Limited Surface acoustic wave filter
US6650207B1 (en) * 2000-04-24 2003-11-18 Mitsubishi Denki Kabushiki Kaisha Longitudinally coupled surface acoustic wave filter with linearly weighted reflectors

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