Surface acoustic wave transducer

Details Surface acoustic wave transducer Surface acoustic wave transducer

1980-12-03

1982-12-14

Shoop, William M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

333154, 333196, H01L 4108

Patent

active

043639909

ABSTRACT:
A surface acoustic wave transducer having a piezoelectric thin film, interdigital electrodes disposed on one side surface of said piezoelectric thin film and an apodized counter electrode disposed on the opposite-side surface of said piezoelectric thin film. The outline of the apodized counter electrode is composed of parallel edges parallel to fingers of the interdigital electrode and perpendicular edges perpendicular to the fingers. The parallel edges are positioned in gaps between the fingers, so as not to lie over the fingers. Such structure remarkably reduces the deviation of characteristics of the transducer due to the incomplete alignment of the counter electrode with the interdigital electrode.

REFERENCES:
patent: 3676721 (1972-07-01), Van Den Heuvel et al.
patent: 3760204 (1973-09-01), Yester, Jr.

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