Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

1982-04-23

1984-05-29

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313D, 333153, 333196, H03H 976, H03H 964, H03H 9145

Patent

active

044518056

ABSTRACT:
A surface acoustic wave filter which comprises a substrate of piezoelectric material and a multistrip coupler. The multistrip coupler comprises a plurality of parallel conductive strips formed on the substrate; at least one input transducer is disposed on one side of the multistrip coupler, and at least one output transducer is disposed on the other side of the multistrip coupler. The surface acoustic wave filter is characterized in that a part of the middle portion of each of the conductive strips of the multistrip coupler is made of a photoconductive material.

REFERENCES:
patent: 3446974 (1969-05-01), Seiwatz
patent: 3706055 (1972-12-01), Dieulesaint et al.
patent: 3911381 (1975-10-01), Brooks et al.
Crowley et al., "Acoustoelectrically Controlled Saw Divider", 1977 Ultrasonics Symposium Proceedings, IEEE Cat. 77CH1264-1SU, Oct. 1977, Phoenix, Az.; pp. 633-636.
Patent Abstracts of Japan, vol. 2, No. 58, Apr. 26, 1978, p. 1675.
Patent Abstracts of Japan, vol. 2, No. 55, Apr. 21, 1978, p. 1303.

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