Asymmetrical notch filter

Details Asymmetrical notch filter Asymmetrical notch filter

1995-10-16

1997-02-11

Lee, Benny

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333202, H03H 701

Patent

active

056025165

ABSTRACT:
A dual stage filter providing a relatively deep notch whose attenuation versus frequency curve is asymmetrical. The filter consists of a helical transmission line one end of which is connected to electrical ground. The opposite end is connected to a variable piston capacitor whose remaining end is also connected to ground. The ungrounded junction of these two components is connected to an input connector through a series capacitor. An identical circuit is arranged and connected to the output connector. These two circuits are isolated from each other by a conductive partition and housing. A series inductor connects the input and output connector. A matching capacitor is connected in parallel across a portion of the series inductor.

REFERENCES:
patent: 4186359 (1980-01-01), Kaegebein
patent: 4449108 (1984-05-01), Endo et al.
patent: 4586007 (1986-04-01), Ciszek
patent: 4901043 (1990-02-01), Palinkas
patent: 5032807 (1991-07-01), Petrovic
patent: 5202656 (1993-04-01), Clark et al.

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