Reduced coupling saw filter

Details Reduced coupling saw filter Reduced coupling saw filter

1999-03-19

2000-04-18

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

333193, H01L 4108

Patent

active

060519088

ABSTRACT:
A relatively narrow fractional bandwidth saw filter formed on a standard ST cut of quartz. The electrode pattern is modified in order to eliminate distortion. In particular, the overlap pattern is formed with one or less active overlaps per wavelength in those regions of the SAW filter where the weighing function is maximum. A plurality of six finger/.lambda. electrode patterns with two active overlaps per wavelength is also provided.

REFERENCES:
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patent: 5021699 (1991-06-01), Dufilie
patent: 5028831 (1991-07-01), Malocha et al.
patent: 5264751 (1993-11-01), Dufilie et al.
patent: 5313177 (1994-05-01), Hickernell et al.
patent: 5438306 (1995-08-01), Yamanouchi et al.
patent: 5663695 (1997-09-01), Tanaka et al.
Hartmann, Clinton S., "Weighting Interdigital Surface Wave Transducers by Selective Withdrawal of Electrodes" 1973 Ultrasonics Symposium Proceedings, IEEE Cat. #73 CHO 807-8SU.

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