Acoustic surface wave device

Details Acoustic surface wave device Acoustic surface wave device

1982-09-07

1984-09-18

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313C, 333151, 333196, H03H 925, H03H 964, H03H 9145

Patent

active

044726945

ABSTRACT:
An acoustic surface wave filter device having an input transducer of interleaved overlapping electrode structure. Acoustic surface wave absorbing material is disposed on a region of the electrodes within the overlap envelope and back of the electrodes having the maximum amount of overlap. The absorbing material suppresses waves traveling backward in the transducer thus greatly reducing the problem of spurious signals caused by acoustic reflections from the edges of the electrodes within the overlap envelope.

REFERENCES:
patent: 4139791 (1979-02-01), Yamada et al.
patent: 4162415 (1979-07-01), Andreev et al.
patent: 4322651 (1982-03-01), Inoue et al.
patent: 4350963 (1982-09-01), Iwamoto et al.
patent: 4354129 (1982-10-01), Ieki

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