Acoustic wave filter

Details Acoustic wave filter Acoustic wave filter

1980-03-06

1982-04-13

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 333196, H03H 964, H03H 925

Patent

active

043250378

ABSTRACT:
An acoustic wave filter comprising a piezoelectric substrate body upon which at least two digital structures are formed and which comprise input and output transducers and form a selective wave reflective pair with at least one of the digital structures having a wide band amplitude characteristic F1 and at least one of the other digital structures having a narrower frequency band amplitude characteristic and wherein the center frequency f1 of the wider band F1 digital structure is displaced relative to the center frequency f2 of the digital structure which has a narrower frequency band F2 by a frequency of .DELTA..sub.f on either side of the center frequency f1 so that one of the zero locations f.sub.R1'2 of the distortion signal F.sub.R of interdigital reflections is placed close to the value of the center frequency f.sub.0 of the filter.

REFERENCES:
patent: 3582838 (1971-06-01), De Vries
Crabb et al., "Surface-Acoustic-Wave Oscillators: Mode Selection and Frequency Modulation", Electronics Letters, May 17, 1973, vol. 9, No. 10, pp. 195-197.

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