Tunable filter

Details Tunable filter Tunable filter

2007-02-22

2009-08-11

Tan, Vibol (Department: 2819)

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

C333S225000, C333S235000

Reexamination Certificate

active

07573356

ABSTRACT:
A tunable filter wherein coupling sections (51, 52, 53) are formed in an input/output line along its lengthwise direction, each coupling section including a gap (G51, G52, G53) formed in the input/output line and coupling electrodes (E5a1, E5b1, E5c1) arranged in the gap in the longitudinal direction of the input/output line; and resonators (41, 42) capable of varying the resonance frequency are connected to the input/output line at the positions between adjacent ones of the coupling sections. Switch means (71, 72, 73) are provided for selectively grounding the coupling electrodes of the coupling sections or selectively short-circuiting the coupling electrodes and the input/output line, and resonance frequency varying means (4m1, 4m2) are provided for varying the resonance frequency of the one or more resonators in association with the switch means.

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