Low-loss tunable radio frequency filter

Details Low-loss tunable radio frequency filter Low-loss tunable radio frequency filter

2010-12-02

2011-11-22

Chang, Daniel D (Department: 2819)

Wave transmission lines and networks

Miscellaneous

Multipactor applications

C333S205000, C333S168000, C333S174000

Reexamination Certificate

active

08063714

ABSTRACT:
A tunable RF filter comprises a signal transmission path having an input and output, a plurality of resonant elements disposed along the signal transmission path between the input and output, and a set of non-resonant elements coupling the resonant elements together to form a stop band having a plurality of transmission zeroes corresponding to respective frequencies of the resonant elements, and at least one sub-band between the transmission zeroes. The set of non-resonant elements comprises a first plurality of non-resonant elements respectively coupled in parallel with the resonant elements, and a second plurality of non-resonant elements respectively coupled in series with the resonant elements. The first plurality of non-resonant elements comprises at least one variable non-resonant element for selectively introducing at least one reflection zero within the stop band to create a pass band in one of the one sub-band(s) without varying any of the second plurality of non-resonant elements.

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