Dielectric resonator with variable diameter through hole and filter with such dielectric resonators
First Claim
1. A dielectric resonator comprising a body formed of a dielectric material, said body having a longitudinal direction and including a through hole in said longitudinal direction, said through hole varying in cross-sectional area perpendicular to said longitudinal direction as a function of said longitudinal direction, said longitudinal through hole adapted such that said body has dielectric material in a volume where a substantial portion of a field of a fundamental mode would exist in response to electromagnetic excitation of said dielectric resonator and provides open space where a substantial portion of a field of at least one spurious mode would exist in response to excitation of said dielectric resonator.
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Accused Products
Abstract
In accordance with the principles of the present invention, a dielectric resonator is provided with a longitudinal through hole with a diameter that varies as a function of height of the resonator so as to increase the frequency spacing between the fundamental mode and the spurious modes.
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Citations
28 Claims
- 1. A dielectric resonator comprising a body formed of a dielectric material, said body having a longitudinal direction and including a through hole in said longitudinal direction, said through hole varying in cross-sectional area perpendicular to said longitudinal direction as a function of said longitudinal direction, said longitudinal through hole adapted such that said body has dielectric material in a volume where a substantial portion of a field of a fundamental mode would exist in response to electromagnetic excitation of said dielectric resonator and provides open space where a substantial portion of a field of at least one spurious mode would exist in response to excitation of said dielectric resonator.
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27. A dielectric resonator circuit comprising:
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a plurality of dielectric resonators, each resonator comprising a body formed of the dielectric material, said body including a longitudinal through hole, said through hole varying in cross-sectional area perpendicular to said longitudinal direction as a function of said longitudinal direction, said longitudinal through hole adapted such that said body has dielectric material in a volume where a substantial portion of a field of a fundamental mode would exist in response to electromagnetic excitation of said dielectric resonator and provides open space where a substantial portion of a field of at least one spurious mode would exist in response to excitation of said dielectric resonator; an enclosure containing said dielectric resonators; an input coupler; an output coupler; wherein at least one of said dielectric resonators is mounted to said enclosure so as to be rotatable relative to another of said dielectric resonators about an axis perpendicular to longitudinal axis of said at least one dielectric resonator.
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28. A dielectric resonator circuit comprising:
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a plurality of dielectric resonators, each resonator comprising a body formed of the dielectric material, said body including a longitudinal through hole, said through hole varying in cross-sectional area perpendicular to said longitudinal direction as a function of said longitudinal direction, said longitudinal through hole adapted such that said body has dielectric material in a volume where a substantial portion of a field of a fundamental mode would exist in response to electromagnetic excitation of said dielectric resonator and provides open space where a substantial portion of a field of at least one spurious mode would exist in response to excitation of said dielectric resonator and wherein said dielectric resonators are arranged relative to each other so that the geometric centers of said dielectric resonators are on a single line; an enclosure containing said dielectric resonators; an input coupler; an output coupler; a pin mounting each dielectric resonator on said enclosure, each said pin having a first portion coupled to said enclosure and a second portion coupled to a corresponding dielectric resonator, each said pin having a longitudinal axis perpendicular to and intersecting said single line, all of said pins parallel to each other, and wherein said pins are rotatable about their longitudinal axes relative to at least one of said enclosure and said corresponding dielectric resonator.
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Specification