TUNABLE FILTER
First Claim
1. A tunable filter, comprising:
- an input/output line formed on a dielectric substrate;
at least two coupling sections formed in the input/output line at a distance from each other in the longitudinal direction of the input/output line, each of the coupling sections having a gap formed in the input/output line and one or more coupling electrodes arranged in the gap in the longitudinal direction of the input/output line;
a resonator capable of varying the resonance frequency that is connected to the input/output line between every adjacent two of said coupling sections;
switch means for selectively grounding the coupling electrodes of the coupling sections and/or selectively short-circuiting the coupling electrodes or the coupling electrodes and the input/output line; and
resonance frequency varying means for varying the resonance frequency of the resonator in association with the switch means.
1 Assignment
0 Petitions
Accused Products
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.
10 Citations
20 Claims
-
1. A tunable filter, comprising:
-
an input/output line formed on a dielectric substrate; at least two coupling sections formed in the input/output line at a distance from each other in the longitudinal direction of the input/output line, each of the coupling sections having a gap formed in the input/output line and one or more coupling electrodes arranged in the gap in the longitudinal direction of the input/output line; a resonator capable of varying the resonance frequency that is connected to the input/output line between every adjacent two of said coupling sections; switch means for selectively grounding the coupling electrodes of the coupling sections and/or selectively short-circuiting the coupling electrodes or the coupling electrodes and the input/output line; and resonance frequency varying means for varying the resonance frequency of the resonator in association with the switch means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 20)
-
-
18. A tunable filter, comprising:
-
an input/output line formed on a dielectric substrate; at least two coupling sections formed in the input/output line at a distance from each other in the longitudinal direction of the input/output line, each of the coupling sections having a gap formed in the input/output line, the input/output line having wider parts on the opposite sides of the gap of at least one of the at least two coupling sections, at least one slit extending in the width direction of the input/output line being formed in the wider parts, and a coupling electrode extending in the longitudinal direction of the slit being disposed in each slit; a resonator capable of varying the resonance frequency that is connected to the input/output line between every adjacent two of the coupling sections; switch means for selectively grounding the coupling electrodes of the coupling sections and/or selectively short-circuiting the coupling electrodes or the coupling electrodes and the input/output line; and resonance frequency varying means for varying the resonance frequency of the resonator in association with the switch means. - View Dependent Claims (19)
-
Specification