Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

1991-12-27

1993-06-29

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 333195, H01L 4108

Patent

active

052237621

ABSTRACT:
Two surface acoustic wave resonators are transversely formed with a minute spacing between them on a piezoelectric substrate. Said two surface acoustic wave resonators are oppositely formed to each other to become line-symmetry. Each of the surface acoustic wave resonator comprises an interdigital transducer and reflectors formed on its both sides. An input terminal and an output terminal are lead from the corresponding interdigital transducer. Between the input and the output terminals, an electrostatic capacity is bridged. The electrostatic capacity is formed on, for example, a piezoelectric substrate. In this case, the electrostatic capacity may be formed by alternately interdigitating each part of comb-like electrodes of the two interdigital transducers. Furthermore, the electrostatic capacity may be formed by alternately interdigitating both parts of the two reflector electrodes.

REFERENCES:
patent: 3894251 (1975-07-01), Shibayama et al.
patent: 3909753 (1975-09-01), Burrow
patent: 4314215 (1982-02-01), Tanji et al.
patent: 4468642 (1984-08-01), Hikita et al.
patent: 4734664 (1988-03-01), Hikita et al.
patent: 4803449 (1989-02-01), Hikita et al.
patent: 4931775 (1990-06-01), Sakamoto et al.

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