Electrical filter

Details Electrical filter Electrical filter

1977-11-07

1980-02-12

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333 12, 333176, 333181, H03H 710, H01P 120, H01P 704

Patent

active

041885988

ABSTRACT:
A four-terminal radio frequency interference filter is described which combines a series connected parallel tuned circuit with a pair of capacitors to form a pi network. In one refinement, a quarter wave coaxial stub and a zener diode are connected in parallel with one another and with one leg of the pi network. The series combination of a diode and a resistor are connected in parallel with the other leg. Filtering is improved by inductive coupling between the diode-resistor circuit and the coil of the tuned circuit.

REFERENCES:
patent: 2270416 (1942-01-01), Cork et al.
patent: 2923868 (1960-02-01), Giacoletto
Salzberg-"On the Optimum Length for Transmission Lines Used as Circuit Elements Publication No. St-93 Research and Engineering Dept. RCA, Harrison, N.J., Dec. 1937; Title Page and pp. 1561-1564.

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