Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

1980-06-18

1981-12-29

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 333196, H03H 964, H03H 925

Patent

active

043085105

ABSTRACT:
A surface acoustic wave filter comprises an interdigital transducer structured to excite individually a symmetrical component and an asymmetrical component for the purpose of achieving an asymmetrical frequency characteristic. The interdiginal transducer is divided into a plurality of portion electrodes in the propagating direction of the surface acoustic wave and the divided portion electrodes are electrically connected in series. Accordingly, the electrode fingers adjacent to each other at the dividing region have different potentials. One of the electrode fingers adjacent to each other at the dividing region is configured to be bent or widened toward the other electrode finger, while the other electrode finger is configured to be bent on widened toward the one electrode finger at the extended portion thereof.

REFERENCES:
patent: 4223284 (1980-09-01), Inoue et al.

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