Broadband microwave bulk acoustic delay device

Wave transmission lines and networks – Coupling networks – With impedance matching

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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.

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