Narrow-band filters with zig-zag hairpin resonator
First Claim
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1. A zig-zag hairpin-comb narrow-band bandpass filter, comprising:
- a plurality of side-coupled zig-zag hairpin-comb resonators, each of the zig-zag hairpin-comb resonators comprising a pair of neighboring legs forming an open end and a closed end, the neighboring legs of adjacent zig-zag hairpin-comb resonators straddling a respective coupling gap, at least a portion of each of the neighboring legs from adjacent zig-zag hairpin-comb resonators formed with zig-zag sections; and
wherein each of the plurality of zig-zag hairpin-comb resonators are oriented with their respective open ends in the same direction.
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Abstract
A filter comprising a plurality of zig-zag hairpin-comb resonators that are separated by one or more coupling gaps is provided. The zig-zag hairpin-comb resonators may be fabricated using HTS or non-HTS planar structures, such as microstrip, stripline and suspended stripline. Each of the zig-zag hairpin-comb resonators comprises a pair of neighboring legs. The neighboring legs of adjacent resonators straddle a respective coupling gap. Each of the neighboring legs is formed with zig-zag sections. In this manner, the filters provide unusual compactness, as well as minimizing coupling between the resonators.
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Citations
30 Claims
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1. A zig-zag hairpin-comb narrow-band bandpass filter, comprising:
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a plurality of side-coupled zig-zag hairpin-comb resonators, each of the zig-zag hairpin-comb resonators comprising a pair of neighboring legs forming an open end and a closed end, the neighboring legs of adjacent zig-zag hairpin-comb resonators straddling a respective coupling gap, at least a portion of each of the neighboring legs from adjacent zig-zag hairpin-comb resonators formed with zig-zag sections; and
wherein each of the plurality of zig-zag hairpin-comb resonators are oriented with their respective open ends in the same direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A zig-zag hairpin narrow-band bandstop filter comprising:
a plurality of zig-zag hairpin resonators disposed adjacent to a main transmission line at intervals of a quarter wavelength with the closed end of the resonators adjacent to the main line so as to provide magnetic couplings between the main transmission line and the resonators. - View Dependent Claims (21, 22, 23, 24)
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25. A tunable zig-zag hairpin-comb narrow-band bandpass filter comprising:
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a plurality of side-coupled zig-zag hairpin-comb resonators, each of the zig-zag hairpin-comb resonators comprising a pair of neighboring legs forming an open end and a closed end, the neighboring legs of adjacent zig-zag hairpin-comb resonators straddling a respective coupling gap, at least a portion of each of the neighboring legs from adjacent zig-zag hairpin-comb resonators formed with zig-zag sections, wherein each of the plurality of zig-zag hairpin-comb resonators are oriented with their respective open ends in the same direction, and wherein the respective coupling gap increases in width in the direction of the open end of the zig-zag hairpin-comb resonators;
a variable capacitor provided across the open end of each of the plurality of zig-zag hairpin-comb resonators;
an input coupled to one of the plurality of zig-zag hairpin-comb resonators;
an ouput coupled to one of the plurality of zig-zag hairpin-comb resonators; and
a resonant circuit connected to each of the input and output. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification