Electric circuit using surface acoustic wave device

Details Electric circuit using surface acoustic wave device Electric circuit using surface acoustic wave device

1979-12-07

1981-10-27

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333151, 358905, H03H 964, H03H 942

Patent

active

042976600

ABSTRACT:
A surface acoustic wave device comprises an input and output transducers. A signal is supplied from a signal input circuit to the input transducer and a surface wave corresponding to the input signal is propagated from the input transducer to the output transducer, from which an electrical signal corresponding to the surface wave is withdrawn and is applied to a signal output circuit. An impedance converting circuit is inserted in series between the signal input circuit and the input transducer and/or between the output transducer and the signal output circuit. It has been discovered that this arrangement reduces the electrical triple transit echo.

REFERENCES:
Smith et al.-"Analysis of Interdigital Surface Wave Transducers by Use of an Equivalent Circuit Model", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-17, No. 11, Nov. 1969, pp. 856-864.
Rogers-"The Theory of Networks in Electrical Communication and Other Fields", MacDonald, London, 1957, pp. 405-408 and Title Page.
Johnson-"Multiband L Matching Network" in QST, Dec. 1955, pp. 45-47.

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