Technique for frequency trimming of a saw device using dielectri

Details Technique for frequency trimming of a saw device using dielectri Technique for frequency trimming of a saw device using dielectri

1987-04-24

1988-07-12

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, 333153, 333196, H03H 925, H03H 964

Patent

active

047572833

ABSTRACT:
A surface acoustic wave device includes a substrate which supports surface acoustic wave propagation having a predetermined surface acoustic wave velocity characteristic and a pair of interdigitated transducers coupled to said surface wave propagation surface. The pair of interdigitated transducers are spaced by a region of said surface wave propagation surface. To adjust the surface wave velocity characteristic of said surface wave device, a thin layer of a nonconducting elastic material, such as aluminum oxide or zinc sulfide is deposited onto a portion of the region disposed between the pair of interdigitated transducers, to change the surface wave velocity characteristic of the surface wave device.

REFERENCES:
patent: 3795879 (1974-03-01), Whitehouse et al.
patent: 4243960 (1981-01-01), White et al.
patent: 4435176 (1982-08-01), Grudkowski et al.
"Fine Tuning of Narrow-Band Saw Devices Using Dielectric Overlays", by C. N. Helmick, Jr. et al, 1977 Ultrasonics Symposium Proceedings, IEEE Cat. #77CH1264-ISU, pp. 659-663.
"Observations of Aging and Temperature Effects on Dielectric Coated Saw Devices", by Helmick et al, 1978 Ultrasonics Symposium Proceedings, IEEE Cat. No. 78CH 1344-ISU; pp. 580-585.

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