Surface acoustic wave filter device

Details Surface acoustic wave filter device Surface acoustic wave filter device

1993-03-26

1994-03-15

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313D, 333154, H01L 4108

Patent

active

052948595

ABSTRACT:
A surface acoustic wave filter device includes a substrate which comprises quartz or the like piezoelectric having a small temperature coefficient and which is formed with unidirectional transducers of asymmetrical construction. A floating electrode is spaced from intermediate position between adjacent positive and negative electrodes which are arranged in interdigital manner, to effectively utilize a mechanical reflection caused by the floating electrode. In consideration of the sign and magnitude of the reflection factor of the floating electrodes, short-circuited electrodes only are used for the floating electrodes. The surface acoustic wave filter device has improved temperature characteristic, insertion loss characteristic and phase characteristic.

REFERENCES:
patent: 4464597 (1984-08-01), Setsune
patent: 4516093 (1985-05-01), Nyffler
patent: 4736172 (1988-04-01), Ebneter
patent: 5065065 (1991-11-01), Hikita
patent: 5087901 (1992-02-01), Kurosawa et al.

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