Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

1994-10-07

1996-12-03

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 333195, H01L 4108

Patent

active

055811418

ABSTRACT:
A SAW resonator disposed with an IDT electrode and reflector electrodes is formed on the surface of a piezoelectric substrate. Three pieces of the SAW resonator form an acoustic coupling by being disposed close to each other, electrode fingers comprising the IDT electrode in the center are all grounded, and IDT electrode fingers are electrically independent on the side to be connected to input-output terminals of the IDT electrodes disposed outside. As a result, three excitation modes having different propagation frequencies are generated which are used to attain a broad band SAW resonator filter. When these three pairs of the IDT electrode are electrically independent, a balanced input-output can be achieved, and excellent out-of-band rejection characteristics can be obtained.

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patent: 5059848 (1991-10-01), Mariani
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patent: 5374908 (1994-12-01), Wright
patent: 5426339 (1995-06-01), Wright
patent: 5438305 (1995-08-01), Hikita et al.

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