Unidirectional surface acoustic wave transducer and transversal-

Details Unidirectional surface acoustic wave transducer and transversal- Unidirectional surface acoustic wave transducer and transversal-

1998-11-19

2000-11-14

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313B, 310313D, H03H 9145, H03H 964

Patent

active

061475742

ABSTRACT:
A unidirectional surface acoustic wave transducer includes a plurality of interdigital transducers and a plurality of reflectors disposed on a piezoelectric substrate. The directivity of a first group of the plurality of reflectors is opposite relative to the directivity of a second group of the plurality of reflectors.

REFERENCES:
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patent: 5550793 (1996-08-01), Dufilie
patent: 5663695 (1997-09-01), Tanaka et al.
patent: 5703427 (1997-12-01), Solal et al.
C.S. Hartmann & B.P. Abbott: "Overview of Design Challenges For Single Phase Unidirectional Saw Filters", Proc. IEEE Ultrasonics Symposium (1989) pp. 79-89.
M.F. Lewis: "Low Loss Saw Devices Employing Single Stage Fabrication", Proc. IEEE Ultrasonics Symposium (1983) pp. 104-108.
K. Yamanouchi and H. Furuyashiki: "Low Loss Saw Filter Using Internal Reflection Types of New Single-Phase Unidirectional Transducer", Proc. IEEE Ultrasonics Symposium, (1984) pp. 68-71.

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