Dielectric tube loaded metal cavity resonators and filters
First Claim
1. A dielectric loaded cavity resonator filter having at least one elongate dielectric tube resonator defining a clear through axial opening and sized to receive a tuning screw, said resonator being positioned in a conductive cavity, said elongate dielectric tube resonator being substantially the entire height of said conductive cavity and having a length which is equal to or greater than its diameter, and means for securing said dielectric tube resonator in said cavity.
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Accused Products
Abstract
Dielectric tube loaded metal cavity resonators and filters having a dielectric tube resonator extending substantially the full height of the metallic cavity are disclosed herein. The resonators and filters achieve low insertion loss in a size substantially smaller than conventional dielectric loaded resonators for equivalent quality factors. The dielectric tube resonators may be used with coaxial resonators to provide mixed resonator filter constructions.
45 Citations
22 Claims
- 1. A dielectric loaded cavity resonator filter having at least one elongate dielectric tube resonator defining a clear through axial opening and sized to receive a tuning screw, said resonator being positioned in a conductive cavity, said elongate dielectric tube resonator being substantially the entire height of said conductive cavity and having a length which is equal to or greater than its diameter, and means for securing said dielectric tube resonator in said cavity.
- 8. A dielectric loaded cavity resonator comprising an enclosed housing defining a conductive cavity and an elongate cylindrical dielectric tube resonator defining a clear-through axial opening having first and second ends and sized to receive a tuning screw, said resonator being centrally located in said conductive cavity by a securing mechanism positioned at least partially in one of the group of the first and second ends and the resonator extending substantially the full height of said cavity.
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10. A dielectric loaded cavity resonator having at least one elongate dielectric tube resonator defining a clear through axial opening and sized to receive a tuning screw, said resonator being positioned in a conductive cavity, said elongate dielectric tube resonator extending at least 70% of the height of said cavity and having a length which is equal to or greater than its diameter, and means for securing said dielectric tube resonator in said cavity, and wherein said dielectric tube resonator defines centering formations in the clear-through axial opening, said centering formations engaging said means for securing said dielectric tube resonator at each end of said dielectric tube resonator.
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11. A dielectric loaded cavity resonator filter comprising:
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a housing having a plurality of cavities, each having a height;
a first cylindrical dielectric resonator having a first end, a second end, and a longitudinal opening extending from the first end to the second end, the first cylindrical dielectric resonator positioned within one of the plurality of cavities, and having a height that is substantially the same as the height of the cavity; and
a second resonator positioned within a second one of the plurality of cavities. - View Dependent Claims (12, 13, 14, 15)
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16. A dielectric resonator positioned within a housing defining a cavity having a height, the resonator comprising:
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a first end having a first opening, a second end having a second opening, and a longitudinal opening extending from the first opening to the second opening;
a height that extends at least 70% of the height of the cavity; and
wherein the first opening is operable to receive a tuning screw and wherein the second opening is operable to receive a fastener that substantially closes the second opening when the resonator is positioned within the housing. - View Dependent Claims (17, 18, 19)
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20. A dielectric load cavity resonator filter comprising:
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a housing having a plurality of conductive cavitites, each having a height between opposing walls;
a cylindrical dielectric resonator having a first end and a second end defining a clear-through axial opening therebetween from the first end to the second end with the first end sized to centrally locate sadi resonator inside one of the plurality of conductive cavities with a securing mechanism at one wall of the housing;
a tuning screw at the opposing wall of the housing, said resonator second end extending to partially receive said tuning screw; and
a second resonator positoned within a second one of the plurality of conductive cavities. - View Dependent Claims (21, 22)
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Specification