Higher order transverse mode suppression in surface acoustic wav

Details Higher order transverse mode suppression in surface acoustic wav Higher order transverse mode suppression in surface acoustic wav

1988-12-23

1990-06-12

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310312, 310313R, 333151, 333155, 333194, 29 2535, H01L 4108

Patent

active

049335880

ABSTRACT:
A technique for adjusting the frequency of odd mode transverse waves propagating in a SAW device is described. A pair of localized regions of frequency determining trimming material are deposited onto selected portions of a surface wave propagating surface, to provide localized regions on said surface where the odd order transverse mode has energy maxima. These regions change the acoustic properties and hence the velocity characteristics of the surface wave propagating surface in said regions. The frequency of the odd mode transverse wave is changed accordingly and is preferably changed to match that of the fundamental transverse propagating wave. This decreases the insertion loss of the device at the fundamental frequency and eliminates the odd mode transverse wave propagation characteristic within the operating frequency range of the resonator. In a preferred embodiment, the SAW device further includes an acoustically matched piezoelectric transparent cover disposed over the surface wave propagating surface having disposed thereon a trim pad which is selectively removed to provide the localized regions and thus the localized alterations in the acoustic properties of the surface acoustic wave device.

REFERENCES:
patent: 3581248 (1971-05-01), De Vries
patent: 3818379 (1974-06-01), Wauk, III
patent: 3908137 (1975-09-01), Hunsinger et al.
patent: 4204178 (1980-05-01), Mitchell
patent: 4243960 (1981-01-01), White et al.
patent: 4434383 (1984-02-01), Cho et al.
patent: 4757283 (1988-07-01), Greer

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