Tunable reject filter for radar warning receiver

Details Tunable reject filter for radar warning receiver Tunable reject filter for radar warning receiver

1982-09-23

1984-08-28

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333 35, 333176, 333185, 334 15, 334 45, 455182, H01P 1203, H03H 701

Patent

active

044686447

ABSTRACT:
Spaced conductive strips are formed on a substrate. A first transmission line transformer is connected between the input and one end of the first strip. A second transmission line transformer is connected between the other end of the first strip and the output. The second strip is connected to ground. A shunt tuning circuit is connected between the strips. The circuit includes first and second MOS capacitors mounted on and connected to the grounded strip. An RF choke interconnects the other side of each capacitor. A varactor diode is mounted on and connected to the first capacitor. An etched spiral inductor connects the varactor and the first strip. A bias signal is applied to the junction between the choke and the second capacitor in order to tune the filter.

REFERENCES:
patent: 3079571 (1963-02-01), Elliot et al.
patent: 3651409 (1972-03-01), George et al.
patent: 3864824 (1975-02-01), Watson et al.
patent: 4283694 (1981-08-01), Pauker
patent: 4339559 (1983-08-01), Theriault

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