Filter circuit utilizing a surface acoustic wave filter

Details Filter circuit utilizing a surface acoustic wave filter Filter circuit utilizing a surface acoustic wave filter

1981-06-17

1984-03-20

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333196, H03H 9125, H03H 964

Patent

active

044384173

ABSTRACT:
A filter circuit having a surface acoustic wave filter device which includes a piezoelectric substrate and the input and output transducers disposed on the surface of the substrate, an inductance element connected with the input or output transducer, and, a variable resistor connected in parallel with the inductance element for adjusting the Q-factor value of a resonant circuit comprising the inductance element and capacitance of the surface acoustic wave filter device.

REFERENCES:
patent: 2075181 (1937-03-01), Curtis
patent: 3446974 (1969-05-01), Seiwatz
patent: 3582838 (1971-06-01), DeVries
patent: 4316220 (1982-02-01), Muterspaugh et al.
Hannah et al.-"Broadband Surface-Acoustic-Wave Delay Lines Using Weakly Piezoelectric Substrates," Wave Electronics, 3 (1977/1978); pp. 97-105.

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