GB1363519A - Acoustic surface wave device - Google Patents

Acoustic surface wave device

Info

Publication number
GB1363519A
GB1363519A GB3915971A GB3915971A GB1363519A GB 1363519 A GB1363519 A GB 1363519A GB 3915971 A GB3915971 A GB 3915971A GB 3915971 A GB3915971 A GB 3915971A GB 1363519 A GB1363519 A GB 1363519A
Authority
GB
United Kingdom
Prior art keywords
substrate
surface wave
fingers
glass
change
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.)
Expired
Application number
GB3915971A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3915971A priority Critical patent/GB1363519A/en
Publication of GB1363519A publication Critical patent/GB1363519A/en
Expired 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
    • H03H9/02543—Characteristics of substrate, e.g. cutting angles
    • H03H9/02574—Characteristics of substrate, e.g. cutting angles of combined substrates, multilayered substrates, piezoelectrical layers on not-piezoelectrical substrate

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

1363519 Surface wave devices; oscillators; frequency changers STANDARD TELEPHONES & CABLES Ltd 17 Aug 1972 [20 Aug 1971] 39159/71 Headings H3U and H3F Surface wave transducers 2 comprising interdigitated Al electrodes 4 with two or more fingers on a sputtered-on film of ZnO piezoelectric material 3 are mounted on a glass substrate 1 having the property that the change of acoustic surface wave velocity due to change in temperature is substantially balanced by the thermal expansion of the substrate, so that the wave transmit time between given points of the glass is kept within 6 p.p.m./‹ C. between - 30‹ and 80‹ C. The fingers are either above, or below the 1-5 Á thick piezo film, Figs. 3, 2 (not shown), or the fingers and a gold counter electrode (5), Figs. 4, 5 (not shown), may sandwich the piezo film. For suitable choice of substrate glass, the effect of temperature variation of delay due to the transducer structures can also be compensated. The device can be connected between the input and output of a broad band amplifier (not shown), whence the frequency of oscillation depends only on the phase change through the transducers and substrate, leading to an oscillator stable to less than 1 p.p.m. Exemplary transducer dimensions are disclosed.
GB3915971A 1972-08-17 1972-08-17 Acoustic surface wave device Expired GB1363519A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3915971A GB1363519A (en) 1972-08-17 1972-08-17 Acoustic surface wave device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3915971A GB1363519A (en) 1972-08-17 1972-08-17 Acoustic surface wave device

Publications (1)

Publication Number Publication Date
GB1363519A true GB1363519A (en) 1974-08-14

Family

ID=10407998

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3915971A Expired GB1363519A (en) 1972-08-17 1972-08-17 Acoustic surface wave device

Country Status (1)

Country Link
GB (1) GB1363519A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101852A (en) * 1976-09-21 1978-07-18 Northwestern University Microacoustic shear bulk wave device
US4511816A (en) * 1982-03-11 1985-04-16 Nobuo Mikoshiba Surface acoustic wave device using an elastic substrate and an aluminum nitride piezoelectric film
US4516049A (en) * 1982-10-05 1985-05-07 Nobuo Mikoshiba Multi-layer acoustic surface wave device having minimal delay time temperature coefficient

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101852A (en) * 1976-09-21 1978-07-18 Northwestern University Microacoustic shear bulk wave device
US4511816A (en) * 1982-03-11 1985-04-16 Nobuo Mikoshiba Surface acoustic wave device using an elastic substrate and an aluminum nitride piezoelectric film
US4516049A (en) * 1982-10-05 1985-05-07 Nobuo Mikoshiba Multi-layer acoustic surface wave device having minimal delay time temperature coefficient

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee