Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

1982-08-18

1984-07-03

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

29 2535, 310313C, 333195, H03H 964, H03H 9145

Patent

active

044582218

ABSTRACT:
A high-performance surface acoustic wave filter is provided having a relative band width greater than 0.2, a shape factor less than 1.5, and a flat group delay time characteristic. The filter has input and output transducers, each with overlapped interdigital electrode fingers, spaced on the surface of a piezoelectric substrate, including an apodized transducer and a second transducer. The envelope of the overlapped portions of the electrode fingers in the apodized transducer includes a main lobe and a plurality of side lobes. The height of side lobes of the apodized transducer which are located farther from the second transducer is greater than the height of side lobes nearer the second transducer. The heights of corresponding side lobes on opposite sides of the main lobe are mathematically related.

REFERENCES:
patent: 3633132 (1972-01-01), Hartemann
patent: 3663899 (1972-05-01), Dieulesaint

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