JPS56149818A - Elastic surface wave device - Google Patents

Elastic surface wave device

Info

Publication number
JPS56149818A
JPS56149818A JP5298380A JP5298380A JPS56149818A JP S56149818 A JPS56149818 A JP S56149818A JP 5298380 A JP5298380 A JP 5298380A JP 5298380 A JP5298380 A JP 5298380A JP S56149818 A JPS56149818 A JP S56149818A
Authority
JP
Japan
Prior art keywords
electrode
surface wave
auxiliary electrode
elastic surface
envelope
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
JP5298380A
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 JP5298380A priority Critical patent/JPS56149818A/en
Publication of JPS56149818A publication Critical patent/JPS56149818A/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
    • 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
    • H03H9/14517—Means for weighting
    • H03H9/1452—Means for weighting by finger overlap length, apodisation

Landscapes

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

Abstract

PURPOSE:To improve an unnecessary signal wave response by drawing out an electrode in the part where points of intersection are few, and providing an auxiliary electrode on the other side, in a weighted grid electrode. CONSTITUTION:An auxiliary electrode 7 is provided along the envelope 10 at the position which is the outside of the envelope 10 in the part 6 where a weighted electrode of the point of intersection of the comb line electrode fingers has been drawn out. This auxiliary electrode 7 suppresses a propagation speed of the elastic surface wave propagated on the piezoelectric substrate in this part. As a result, phase shift of the surface wave is removed, an unnecessary signal wave in the trap frequency disappears, and a satisfactory frequency characteristic can be displayed.
JP5298380A 1980-04-23 1980-04-23 Elastic surface wave device Pending JPS56149818A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5298380A JPS56149818A (en) 1980-04-23 1980-04-23 Elastic surface wave device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5298380A JPS56149818A (en) 1980-04-23 1980-04-23 Elastic surface wave device

Publications (1)

Publication Number Publication Date
JPS56149818A true JPS56149818A (en) 1981-11-19

Family

ID=12930134

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5298380A Pending JPS56149818A (en) 1980-04-23 1980-04-23 Elastic surface wave device

Country Status (1)

Country Link
JP (1) JPS56149818A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58200619A (en) * 1982-05-19 1983-11-22 Hitachi Ltd Surface acoustic wave device
JPS6012813A (en) * 1983-07-01 1985-01-23 Murata Mfg Co Ltd Elastic surface wave filter
JPS61113309A (en) * 1984-11-08 1986-05-31 Matsushita Electric Ind Co Ltd Surface acoustic wave filter
JPH03163904A (en) * 1989-11-22 1991-07-15 Hitachi Ltd Surface acoustic wave filter and communication equipment using same
US5175519A (en) * 1989-04-25 1992-12-29 Nihon Musen Kabushiki Kaisha Surface elastic wave filter having finger omitted transducers to eliminate side lobes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58200619A (en) * 1982-05-19 1983-11-22 Hitachi Ltd Surface acoustic wave device
JPS6012813A (en) * 1983-07-01 1985-01-23 Murata Mfg Co Ltd Elastic surface wave filter
JPH0563961B2 (en) * 1983-07-01 1993-09-13 Murata Manufacturing Co
JPS61113309A (en) * 1984-11-08 1986-05-31 Matsushita Electric Ind Co Ltd Surface acoustic wave filter
US5175519A (en) * 1989-04-25 1992-12-29 Nihon Musen Kabushiki Kaisha Surface elastic wave filter having finger omitted transducers to eliminate side lobes
JPH03163904A (en) * 1989-11-22 1991-07-15 Hitachi Ltd Surface acoustic wave filter and communication equipment using same

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