Filter having an electromagnetically tunable transmission zero

Details Filter having an electromagnetically tunable transmission zero Filter having an electromagnetically tunable transmission zero

1994-02-28

1996-08-06

Lee, Benny

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333205, 333207, H01P 1201

Patent

active

055437648

ABSTRACT:
A transmission line filter comprises four resonators (100, 200, 300, 400), and transmission zeroes can be added to the transfer function of the filter using a known phasing coupling technique using a transmission line (53, 54) coupled between two resonators. The location of the transmission zeroes can be varied using control circuits (A,B). Each control circuit comprises a series coupled inductance (55, 58) and capacitance (56, 59) forming a resonance circuit, the resonance frequency of which can be varied using a variable d.c. voltage (V.sub.1, V.sub.2). The inductance of each control circuit is arranged adjacent its respective transmission line so that the two are weakly electromagnetically coupled. By supplying the variable voltage to the resonance circuits, normal operation of the phasing coupling is affected, thereby varying the location of the transmission zero. One or more control circuits can be provided for filters having transmission zeroes in their transfer function which need to be varied. The provision of these control circuits allow transmission zeroes to be selected in situ, rather than solely during manufacture.

REFERENCES:
patent: 4418324 (1983-11-01), Higgins
patent: 4536725 (1985-08-01), Hubler
patent: 5138288 (1992-08-01), Blackburn
patent: 5227748 (1993-07-01), Sroka

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