Surface elastic wave filter having finger omitted transducers to

Details Surface elastic wave filter having finger omitted transducers to Surface elastic wave filter having finger omitted transducers to

1990-04-18

1992-12-29

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313B, 310313C, 333196, H03H 964

Patent

active

051755190

ABSTRACT:
A surface elastic wave filter includes a plurality of input interdigital transducers for receiving a high-frequency input signal, and a plurality of output inter-digital transducers for producing an output signal derived from the input signal and having predetermined frequency characteristics. Each of the input and output interdigital transducers having a pair of confronting connectors for receiving the input signal and extracting the output signal, respectively, and a pair of groups of interdigitating electrode fingers extending from the connectors. The input and/or output interdigital transducers include finger-withdrawn interdigital transducers with electrode fingers selectively withdrawn in different positions. With such withdrawal weighting, the interdigital transducers have different sidelobe characteristics, i.e., frequency blocking characteristics, so that the surface elastic wave filter operates with a greater sidelobe suppression.

REFERENCES:
patent: 3946342 (1976-03-01), Hartmann
patent: 4321567 (1982-03-01), Sandy
patent: 4464597 (1989-08-01), Setsune
patent: 4491758 (1985-01-01), Hartmann
patent: 4492940 (1985-01-01), Hikita
patent: 4600852 (1986-07-01), Gerber
"Soviet Journal of Communications Technology and Electronics", Scripta Technica Inc., vol. 32, Jan. 1987, pp. 159-160.

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