JPS5555611A - Surface acoustic wave device - Google Patents

Surface acoustic wave device

Info

Publication number
JPS5555611A
JPS5555611A JP12837778A JP12837778A JPS5555611A JP S5555611 A JPS5555611 A JP S5555611A JP 12837778 A JP12837778 A JP 12837778A JP 12837778 A JP12837778 A JP 12837778A JP S5555611 A JPS5555611 A JP S5555611A
Authority
JP
Japan
Prior art keywords
electrode
acoustic wave
surface acoustic
dip
peak
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
JP12837778A
Other languages
Japanese (ja)
Inventor
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 JP12837778A priority Critical patent/JPS5555611A/en
Publication of JPS5555611A publication Critical patent/JPS5555611A/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
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves

Landscapes

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

Abstract

PURPOSE:To sufficiently keep the ratio of peak and dip of comb type characteristics, by taking greater the duty factor of the third electrode remote to the first electrode than that of the second electrode near to it. CONSTITUTION:On the surface of piezoelectric board 1, the first electrode 2 converting electric signal to surface acoustic wave, second and third electrodes 3 and 4 converting the surface acoustic wave into electric signal again, are provided. Further, the duty factor represented in the sum 2a of the width of electrode of one period to the periodical length 2P of the reed screen electrode is taken greater for the electrode 4 than for the electrode 3, allowing to make greater the electric capacitance of the electrode 4 than that of the electrode 3 to compensate the decrease in the strength of surface acoustic wave by the loss in reflection propagation and diffraction of the electrode 3. The output of the same level can be obtained to sufficiently assure the ratio of peak and dip of the comb type characteristics.
JP12837778A 1978-10-20 1978-10-20 Surface acoustic wave device Pending JPS5555611A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12837778A JPS5555611A (en) 1978-10-20 1978-10-20 Surface acoustic wave device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12837778A JPS5555611A (en) 1978-10-20 1978-10-20 Surface acoustic wave device

Publications (1)

Publication Number Publication Date
JPS5555611A true JPS5555611A (en) 1980-04-23

Family

ID=14983307

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12837778A Pending JPS5555611A (en) 1978-10-20 1978-10-20 Surface acoustic wave device

Country Status (1)

Country Link
JP (1) JPS5555611A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498150A (en) * 1972-05-10 1974-01-24
JPS498151A (en) * 1972-05-10 1974-01-24
JPS5394154A (en) * 1977-01-28 1978-08-17 Hitachi Ltd Elastic surface wave device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498150A (en) * 1972-05-10 1974-01-24
JPS498151A (en) * 1972-05-10 1974-01-24
JPS5394154A (en) * 1977-01-28 1978-08-17 Hitachi Ltd Elastic surface wave device

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