Electrode pattern for surface acoustic wave device

Details Electrode pattern for surface acoustic wave device Electrode pattern for surface acoustic wave device

1983-07-05

1984-09-18

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

044726538

ABSTRACT:
A surface acoustic wave device comprises on a piezoelectric substrate a first interdigital electrode array for converting electric signals into surface acoustic waves and a second interdigital electrode array for receiving the surface acoustic waves propagating from the first interdigital electrode array along the surface portion of the piezoelectric substrate to convert them into electric signals again. The lengths of overlapping of the pairs of adjacent interdigital electrode or finger portions in each of the first and second electrode arrays are not the same. The distribution of the overlapping finger lengths in one of the first and second electrode arrays along the direction of propagation of the surface acoustic waves or the transverse direction of the piezoelectric substrate is such that the overlapping finger length has the minimum value at a central portion of the one electrode array and gradually increases toward both sides of the one electrode array.

REFERENCES:
patent: 3768032 (1973-10-01), Mitchell

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