Varactor tuned helical resonator for use with duplex filter

Details Varactor tuned helical resonator for use with duplex filter Varactor tuned helical resonator for use with duplex filter

1996-11-14

1998-02-10

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333175, 333176, H01P 120

Patent

active

057173680

ABSTRACT:
A radio frequency filter comprising several resonator circuits, such as duplex filter, is provides with a given passband. Signal frequencies generating spurious response, mirror frequencies, etc. can be effectively attenuated so that the filter comprises one more resonator circuit connected as a bandstop circuit. That comprises a transmission line resonator (Res), a series connection of an inductive element (MLIN2) and a capacitance diode (D), one end of the series connection being couples to a coupling point in the transmission line resonator, dividing it into two parts (TLIN1, TLIN2), and the other end being couples to the output connector (1) of the radio frequency filter. In addition, means are provided for carrying the direct voltage (V+) to the cathode of the capacitance diode, whereby the series resonance frequency changes according to the control voltage.

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patent: 5107233 (1992-04-01), Stoft
patent: 5227748 (1993-07-01), Sroka
Patent Abstracts of Japan, Publication No. JP1089709, published Apr. 4, 1989, page 1 of 1.

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