Wave transmission lines and networks – Coupling networks – With impedance matching
Patent
1974-11-08
1976-03-02
Gensler, Paul L.
Wave transmission lines and networks
Coupling networks
With impedance matching
310 95, 310 97, 333 72, H03H 926, H03H 930, H01L 4110
Patent
active
039421392
ABSTRACT:
A thin film piezoelectric transducer generates bulk mode ultrasonic elastic waves which propagate into a transmission medium, such as silicon. The wave is reflected back towards the first transducer by a reflecting surface. A second transducer is located adjacent to the first transducer and receives the acoustic wave from the reflected surface. The path length of the ultrasonic wave from the first transducer to the second transducer is long enough to enable the bulk wave to be in the Fraunhofer field. An acoustic absorbing material, such as indium, may be placed on the reflecting surface and on the surface containing the two transducers in selective areas to reduce undesired reflections. The structure is suitable for use in the microwave region wherein the insertion loss may be relatively constant over a given frequency band.
REFERENCES:
patent: 2398701 (1946-04-01), Firestone
patent: 2839731 (1958-06-01), McSkimin
patent: 3150275 (1964-09-01), Lucy
patent: 3240962 (1966-03-01), White
patent: 3247473 (1966-04-01), Allen
patent: 3582834 (1971-06-01), Evans
Mason-"Physical Acoustics," I Part A, Academic Press, New York and London, 1964, pp. 491-494.
Cooper Herbert Warren
DEKlerk John
Gensler Paul L.
Nussbaum Marvin
Trepp R. M.
Westinghouse Electric Corporation
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