JPS5574230A - Surface acoustic wave device - Google Patents

Surface acoustic wave device

Info

Publication number
JPS5574230A
JPS5574230A JP14765478A JP14765478A JPS5574230A JP S5574230 A JPS5574230 A JP S5574230A JP 14765478 A JP14765478 A JP 14765478A JP 14765478 A JP14765478 A JP 14765478A JP S5574230 A JPS5574230 A JP S5574230A
Authority
JP
Japan
Prior art keywords
electrode
similarly
reflected
wave
transmission
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.)
Granted
Application number
JP14765478A
Other languages
Japanese (ja)
Other versions
JPS6156895B2 (en
Inventor
Koichi Sugawara
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.)
Japan Radio Co Ltd
Original Assignee
Japan Radio Co 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 Japan Radio Co Ltd filed Critical Japan Radio Co Ltd
Priority to JP14765478A priority Critical patent/JPS5574230A/en
Publication of JPS5574230A publication Critical patent/JPS5574230A/en
Publication of JPS6156895B2 publication Critical patent/JPS6156895B2/ja
Granted 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 elements; 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
    • H03H9/0285—Means for compensation or elimination of undesirable effects of reflections of triple transit echo
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02637—Details concerning reflective or coupling arrays
    • H03H9/02685—Grating lines having particular arrangements
    • H03H9/02708—Shifted grating lines

Landscapes

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

Abstract

PURPOSE:To suppress the tripple transit echo, by providing the shield electrode of lattice shape having twisted part by the transmission wave length/4 on the propagation path of surface acoustic waves. CONSTITUTION:The shield electrode 6 of lattice type twisting the upper part 6' and the lower part 6'' by lambda0/4 (where: lambda0 is transmission wave length), is placed between the transmission and reception electrodes 2 and 3. A-F and A'-F' are reflections of the reflection wave MEL reflected at the reception electrode and the reflection wave RW reflected at the load, A and A' are cancelled with the phase difference of 180 deg., and B, B'-F and F' are disappeared with cancellation each other similarly. TTE being the vector sum of MEL and RW repeats the above process three times, then attenuation is made much. On the other hand, the desired wave is reflected partly at the electrode 6 similarly, but the component is similarly cancelled and since the number of passage of the electrode 6 for the desired wave is once, the attenuation is less in comparison with that for TTE.
JP14765478A 1978-11-29 1978-11-29 Surface acoustic wave device Granted JPS5574230A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14765478A JPS5574230A (en) 1978-11-29 1978-11-29 Surface acoustic wave device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14765478A JPS5574230A (en) 1978-11-29 1978-11-29 Surface acoustic wave device

Publications (2)

Publication Number Publication Date
JPS5574230A true JPS5574230A (en) 1980-06-04
JPS6156895B2 JPS6156895B2 (en) 1986-12-04

Family

ID=15435232

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14765478A Granted JPS5574230A (en) 1978-11-29 1978-11-29 Surface acoustic wave device

Country Status (1)

Country Link
JP (1) JPS5574230A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63215108A (en) * 1987-02-19 1988-09-07 ヘーゼルタイン　コーポレーション Surface elastic wave device
EP1115200A3 (en) * 2000-01-05 2008-02-20 Fujitsu Limited Surface acoustic wave filter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5231347U (en) * 1975-08-26 1977-03-04
JPS5231347A (en) * 1975-09-04 1977-03-09 Furukawa Battery Co Ltd Zinc plate

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5231347U (en) * 1975-08-26 1977-03-04
JPS5231347A (en) * 1975-09-04 1977-03-09 Furukawa Battery Co Ltd Zinc plate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63215108A (en) * 1987-02-19 1988-09-07 ヘーゼルタイン　コーポレーション Surface elastic wave device
US4870312A (en) * 1987-02-19 1989-09-26 Hazeltine Corporation Surface wave device having anti-reflective shield
EP1115200A3 (en) * 2000-01-05 2008-02-20 Fujitsu Limited Surface acoustic wave filter

Also Published As

Publication number Publication date
JPS6156895B2 (en) 1986-12-04

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