Variable bandwidth crystal filter with varactor diodes

Details Variable bandwidth crystal filter with varactor diodes Variable bandwidth crystal filter with varactor diodes

1989-04-27

1991-09-24

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333189, H03H 958

Patent

active

050517112

ABSTRACT:
A crystal filter with continuously variable passband, and a constant input and output impedance using quartz crystals, fixed inductors and varactor diodes. The width of the filter passband is set by a DC voltage on a single control line through a resistor biasing network.

REFERENCES:
patent: 2248776 (1941-07-01), Och
patent: 2267957 (1941-12-01), Sykes
patent: 3110004 (1963-11-01), Pope
patent: 3416104 (1968-12-01), Argoudelis
patent: 3697903 (1972-10-01), Sauerland
patent: 4028647 (1977-06-01), Yee
patent: 4060776 (1977-11-01), Blinchikoff
patent: 4342014 (1982-07-01), Arvanitis
patent: 4849721 (1989-07-01), Matsuura

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