Tunable filter
First Claim
1. A tunable filter, comprising:
- an input/output line formed on a dielectric substrate;
at least two coupling sections inserted in series 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 including a gap dividing the input/output line in a width direction thereof, and one or more coupling electrodes arranged in the gap in the longitudinal direction of the input/output line;
a resonator connected to the input/output line between every adjacent two of said coupling sections and configured to vary a resonance frequency thereof;
switch means for performing at least one of selective grounding of the coupling electrodes of the coupling sections and selective short-circuiting among the coupling electrodes or between the coupling electrodes and the input/output line to vary a frequency bandwidth of each coupling section; and
resonance frequency varying means for varying the resonance frequency of the resonator in association with the switch means.
1 Assignment
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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.
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Citations
20 Claims
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1. A tunable filter, comprising:
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an input/output line formed on a dielectric substrate; at least two coupling sections inserted in series 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 including a gap dividing the input/output line in a width direction thereof, and one or more coupling electrodes arranged in the gap in the longitudinal direction of the input/output line; a resonator connected to the input/output line between every adjacent two of said coupling sections and configured to vary a resonance frequency thereof; switch means for performing at least one of selective grounding of the coupling electrodes of the coupling sections and selective short-circuiting among the coupling electrodes or between the coupling electrodes and the input/output line to vary a frequency bandwidth of each coupling section; 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)
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18. A tunable filter, comprising:
- an input/output line formed on a dielectric substrate;
at least two coupling sections inserted in series 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 including a gap dividing the input/output line in a width direction thereof, the divided input/output lines having wider parts opposing each other via the gap of at least one of said 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 connected to the input/output line between every adjacent two of the coupling sections and configured to vary a resonance frequency thereof;
switch means for performing at least one of selective grounding of the coupling electrodes of the coupling sections and selective short-circuiting among the coupling electrodes or between the coupling electrodes and the input/output line to vary a fractional bandwidth of the tunable filter;
resonance frequency varying means for varying the resonance frequency of the resonator in association with the switch means. - View Dependent Claims (19)
- an input/output line formed on a dielectric substrate;
Specification