Surface acoustic wave devices with mode changing characteristics

Details Surface acoustic wave devices with mode changing characteristics Surface acoustic wave devices with mode changing characteristics

1994-04-01

1995-06-20

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 333196, H01L 4108

Patent

active

054263395

ABSTRACT:
A novel surface acoustic wave device that includes a multiple track transducer having a first portion for generating a transverse symmetrical mode acoustic wave and a second portion for receiving only a transverse nonsymmetrical surface acoustic wave such that substantially no direct coupling occurs between the first and second portions of the multiple track transducer and where reflector gratings are mode changing gratings that reflect the transverse symmetrical wave as a transverse nonsymmetrical wave that is received by the second portion of the multiple track transducer thereby substantially reducing undesired in-band surface acoustic wave transducer responses as well as spurious bulk responses and allowing a narrow passband to be obtained with a short structure when compared with the prior art structures.

REFERENCES:
patent: 3987379 (1976-10-01), De Vries
patent: 3988703 (1976-10-01), De Vries
patent: 4072291 (1978-02-01), Mitchell
patent: 4178571 (1979-12-01), Mitchell
patent: 4649357 (1987-03-01), Nagai et al.
patent: 5010269 (1991-04-01), Mikita et al.
patent: 5296824 (1994-03-01), Cho et al.
Morgan, "Simplifications For Analysis Of Saw Multipole Resonators", 1993 Ultrasonics Symposium -173.

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