Band-stop filter

Details Band-stop filter Band-stop filter

1989-10-17

1991-01-08

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333223, 333226, H01P 1202

Patent

active

049839381

ABSTRACT:
A band-stop filter comprises a plurality of resonator units each comprised of an end-shorted coaxial resonator and a variable condenser connected in series therewith, a printed circuit board combining said resonator units in a multistage having thru-holes adjacent a bushing which isolates the inner conductor of the end-shorted coaxial resonator from the printed circuit board. A thru-hole conductor is provided in the thru-hole, and an adjusting screw having a radius is a little larger than the thru-hole. The adjusting screw can have both the proper torque and the electrical connection. The inner conductor surface of the resonator operates electrically as a stator and the adjusting screw operates as a rotor.

REFERENCES:
patent: Re32768 (1988-10-01), D'Avello et al.
patent: 4179673 (1976-12-01), Nishikawa et al.
patent: 4255729 (1981-03-01), Fukasawa et al.
patent: 4342972 (1982-08-01), Nishikawa et al.
patent: 4386328 (1983-05-01), Masuda et al.
patent: 4426631 (1984-01-01), D'Avello et al.
patent: 4431977 (1984-02-01), Sokola et al.
patent: 4434410 (1984-02-01), Miyake et al.
patent: 4546334 (1985-10-01), Nishikawa et al.
patent: 4703291 (1987-10-01), Nishikawa et al.

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