Amplitude correction of field coupled varactor tuned filters

Details Amplitude correction of field coupled varactor tuned filters Amplitude correction of field coupled varactor tuned filters

1990-10-15

1992-04-21

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333174, 333175, 333185, H03H 700

Patent

active

051072335

ABSTRACT:
In a multi-stage, varactor-tuned bandpass filter utilizing electromagnetic field coupling between successive filter stages, the effective area of a coupling window provided in the RF shielding separating the filter stages is varied as a function of the varactor tune voltage to provide a flat frequency response over the filter frequency range. The bias current through a PIN diode connected across the coupling window is controlled by varactor tune voltage to effectively decrease the window area with increasing filter frequency.

REFERENCES:
patent: 3277406 (1966-10-01), Ocker
patent: 3715690 (1973-02-01), Young et al.
patent: 4760535 (1988-07-01), Englmeier
patent: 4839617 (1989-06-01), Speake
patent: 4970479 (1990-11-01), Landt et al.
Walters et al, "Helical filters with PIN-diode Q-control for Pre-converter AGC, Conference on Radio Receivers & Associated Systems", Jul. 1972, pp. 61-67.

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