High electromechanical-coupling coefficient surface acoustic wav

Details High electromechanical-coupling coefficient surface acoustic wav High electromechanical-coupling coefficient surface acoustic wav

1983-08-29

1985-10-01

Wong, Peter S.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313A, 333154, 333194, H03H 925

Patent

active

045448574

ABSTRACT:
A high electromechanical-coupling surface acoustic wave device has a lithium niobate rotated Y-cut crystal as a piezoelectric substrate, and a thin high-density film formed on a predetermined portion of the lithium niobate rotated Y-cut crystal which includes at least a propagation path along which the surface acoustic wave propagates. A Love wave propagates in the thin or thick high-density film on the surface of the lithium niobate rotated Y-cut crystal substrate, so that the electromechanical coupling coefficient of the thin film can be improved, and spurious response caused by a Rayleigh wave can be eliminated.

REFERENCES:
patent: 3795879 (1974-03-01), Whitehouse
patent: 4480237 (1984-10-01), Yamada
Matthews, H., ed., "Surface Wave Filters", Wiley, 1977, pp. 26-37.

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