Surface acoustic wave device

Details Surface acoustic wave device Surface acoustic wave device

1995-03-16

1997-02-18

Budd, Mary O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313R, 333193, H01L 4108

Patent

active

056043937

ABSTRACT:
A surface acoustic wave (SAW) device includes a plurality of SAW filters connected in cascade. An impedance matching element in the form of a SAW resonator is interposed between two adjoining SAW filters. Each filter includes a first piezoelectric substrate having a first electromechanical coupling factor and the resonator includes a second piezoelectric substrate having a second electromechanical coupling factor. The second electromechanical coupling factor is greater than the first factor so that the inductive band of the SAW resonator is wider than the pass band of the SAW filter. The device affords improved filter properties including an increased fractional bandwidth and an increased out-of-band attenuation.

REFERENCES:
patent: 4954793 (1990-09-01), Misu et al.
patent: 5202652 (1993-04-01), Tabuchi et al.
patent: 5486800 (1996-01-01), Davenport

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