JPS5498158A - Surface elastic wave unit - Google Patents

Surface elastic wave unit

Info

Publication number
JPS5498158A
JPS5498158A JP433178A JP433178A JPS5498158A JP S5498158 A JPS5498158 A JP S5498158A JP 433178 A JP433178 A JP 433178A JP 433178 A JP433178 A JP 433178A JP S5498158 A JPS5498158 A JP S5498158A
Authority
JP
Japan
Prior art keywords
thin film
piezo
inter
matching
conductive thin
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
JP433178A
Other languages
Japanese (ja)
Inventor
Akitsuna Yuhara
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 JP433178A priority Critical patent/JPS5498158A/en
Publication of JPS5498158A publication Critical patent/JPS5498158A/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
    • H03H9/02637—Details concerning reflective or coupling arrays
    • 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
    • H03H9/02637—Details concerning reflective or coupling arrays
    • H03H9/02779—Continuous surface reflective arrays

Landscapes

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

Abstract

PURPOSE:To cancel mismatching by using a conductive thin film wiring, which is provided on the piezo-electric characteristic substrate where an inter-digital transducer will be provided, as a micro strip line to form an impedance matching circuit. CONSTITUTION:For the purpose of obtaining the matching to an external circuit, a thin film distribution constant matching circuit is provided on the propagation path of the elastic surface unit where input inter-digital transducer 5 and output inter-digital transducer 6 are provided on piezo-electric substrate 3. The thin film distribution constant matching circuit consists of the micro strip line where piezo- electric substrate 3 is used as a dielectric and conductive thin film wirings 7 and 9 are provided, and selects properly a characteristic impedance to obtain the matching to the external circuit by changing the length and the width of conductive thin film wirings 7 and 9. Now, 11 in the figure indicates a shield electrode.
JP433178A 1978-01-20 1978-01-20 Surface elastic wave unit Pending JPS5498158A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP433178A JPS5498158A (en) 1978-01-20 1978-01-20 Surface elastic wave unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP433178A JPS5498158A (en) 1978-01-20 1978-01-20 Surface elastic wave unit

Publications (1)

Publication Number Publication Date
JPS5498158A true JPS5498158A (en) 1979-08-02

Family

ID=11581454

Family Applications (1)

Application Number Title Priority Date Filing Date
JP433178A Pending JPS5498158A (en) 1978-01-20 1978-01-20 Surface elastic wave unit

Country Status (1)

Country Link
JP (1) JPS5498158A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4409567A (en) * 1979-12-28 1983-10-11 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave device
JPH03297211A (en) * 1990-04-16 1991-12-27 Oki Electric Ind Co Ltd Surface acoustic wave filter
EP0617378A1 (en) * 1993-03-22 1994-09-28 Canon Kabushiki Kaisha Surface acoustic wave element resolving variations in properties in connection with matching circuit, signal receiver using it, and communication system using it
US5438305A (en) * 1991-08-12 1995-08-01 Hitachi, Ltd. High frequency module including a flexible substrate

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4931230B1 (en) * 1970-05-14 1974-08-20

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4931230B1 (en) * 1970-05-14 1974-08-20

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4409567A (en) * 1979-12-28 1983-10-11 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave device
JPH03297211A (en) * 1990-04-16 1991-12-27 Oki Electric Ind Co Ltd Surface acoustic wave filter
US5438305A (en) * 1991-08-12 1995-08-01 Hitachi, Ltd. High frequency module including a flexible substrate
EP0617378A1 (en) * 1993-03-22 1994-09-28 Canon Kabushiki Kaisha Surface acoustic wave element resolving variations in properties in connection with matching circuit, signal receiver using it, and communication system using it

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