Low reflectivity apodized surface acoustic transducer with means

Details Low reflectivity apodized surface acoustic transducer with means Low reflectivity apodized surface acoustic transducer with means

1980-10-09

1982-06-01

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313C, 333151, 333154, H03H 9145, H03H 925, H03H 964

Patent

active

043330657

ABSTRACT:
In order to reduce the reflectivity of an apodized surface acoustic wave transducer, one portion of the dummy area thereof is bare and another portion is 100% metallized, and the boundary between these two regions is shaped to equalize total acoustic transit times across the transducer aperture. This avoids any net refraction, and thus permits any acoustic wavefronts which traverse the two regions to remain flat.

REFERENCES:
patent: 4023124 (1977-05-01), Parker et al.
patent: 4144508 (1979-03-01), Lewis et al.
patent: 4158823 (1979-06-01), Kuny et al.

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