Tunable filter having a capacitive circuit connected to ground

Details Tunable filter having a capacitive circuit connected to ground Tunable filter having a capacitive circuit connected to ground

1995-03-02

1996-11-12

Lee, Benny

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333168, H03H 712

Patent

active

055744133

ABSTRACT:
A tunable filter (100) includes first and second resonant structures (140, 145) coupled by a capacitive coupler (120). The capacitive coupler (120) includes two tunable elements (121, 126) coupled by a capacitive circuit formed at least in part by a capacitive pi-network (130).

REFERENCES:
patent: 3049682 (1962-08-01), Waring
patent: 4430630 (1984-07-01), Sakamoto
patent: 4586007 (1986-04-01), Ciszek
patent: 4839617 (1989-06-01), Speake
patent: 5150085 (1992-09-01), Hales
patent: 5202656 (1993-04-01), Clark et al.
patent: 5285179 (1994-02-01), Wignot et al.
patent: 5376907 (1994-12-01), Duflot et al.

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