Surface acoustic wave resonator

Details Surface acoustic wave resonator Surface acoustic wave resonator

1991-10-02

1993-04-20

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313D, 333195, H01L 4108

Patent

active

052045757

ABSTRACT:
A surface acoustic wave resonator having an interdigital transducer on a piezoelectric substrate. Grating reflectors, which have electrode strips of the same width and the same pitch as those of electrodes of the interdigital transducer and of a number smaller than 1/5 that of said electrodes of said interdigital transducer, are disposed at the intervals equal to said pitch at both sides of said interdigital transducer on a surface wave propagation path. The electrode portion of the interdigital transducer is weighted so that the aperture of the interdigital transducer is maximum at the center of the interdigital transducer and uniformly decreases toward its both sides along respective sides of a rhombus with its vertices at the centers of the outermost electrode strips of the grating reflectors.

REFERENCES:
patent: 4206380 (1980-06-01), Hazama et al.
patent: 4322651 (1982-03-01), Inoue et al.
patent: 4388600 (1983-06-01), Wakino et al.
patent: 4634913 (1987-01-01), Whatmore et al.

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