Dual mode dielectric resonator filters without iris
First Claim
1. A dual hybrid mode dielectric resonator band pass filter, comprising:
- a tubular enclosure including a first plurality of n, n is a whole number, cascade couple ceramic dielectric-loaded disk resonators, wherein each of said resonators is spaced from each other and coaxially supported in said tubular enclosure;
means for exciting said resonators in said tubular enclosure so as to provide dual hybrid modes, said means for exciting including first and second probes fixed to and penetrated into said enclosure for providing input and output ports, coupling means for providing cross coupling of two orthogonal modes of each resonator, wherein said probes coupled the radial electric fields of said two orthogonal modes of said resonators and wherein the depth of penetration into said enclosure and the thickness of said probe is proportional to the amount of coupling of said dual-modes; and
wherein the cascade coupling between the n/2 and the (n+1)/2 th resonator of said first plurality n resonators is determined by an iris placed between said n/2 and (n+1)/2 th resonator, and wherein the cascade coupling between a second plurality of adjacent resonators is determined by the spacing between any two resonators of said second plurality and wherein said second plurality of adjacent resonators is defined as adjacent ones of the 1st to n/2th as well as adjacent ones of the (n+1)/2 th to n th ones of said first plurality n of adjacent resonators.
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Accused Products
Abstract
A microwave band pass filter including dual-mode dielectric resonators mounted in a tubular enclosure to achieve coupling among the resonators without an iris. The filter is implemented in a canonical symmetric form, as longitudinal dual-mode realization or a canonical asymmetric form. The microwave band pass filter has input and output coaxial probes located along the enclosure with tuning and coupling screws provided to enable adjustment control of the frequency of resonance of the dielectric resonators and to control the coupling of energy from one resonant mode to an orthogonal mode in the same resonator. Lastly, the coupling of energy from one resonator to an adjacent resonator is accomplished by properly placed coupling screws.
38 Citations
12 Claims
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1. A dual hybrid mode dielectric resonator band pass filter, comprising:
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a tubular enclosure including a first plurality of n, n is a whole number, cascade couple ceramic dielectric-loaded disk resonators, wherein each of said resonators is spaced from each other and coaxially supported in said tubular enclosure; means for exciting said resonators in said tubular enclosure so as to provide dual hybrid modes, said means for exciting including first and second probes fixed to and penetrated into said enclosure for providing input and output ports, coupling means for providing cross coupling of two orthogonal modes of each resonator, wherein said probes coupled the radial electric fields of said two orthogonal modes of said resonators and wherein the depth of penetration into said enclosure and the thickness of said probe is proportional to the amount of coupling of said dual-modes; and wherein the cascade coupling between the n/2 and the (n+1)/2 th resonator of said first plurality n resonators is determined by an iris placed between said n/2 and (n+1)/2 th resonator, and wherein the cascade coupling between a second plurality of adjacent resonators is determined by the spacing between any two resonators of said second plurality and wherein said second plurality of adjacent resonators is defined as adjacent ones of the 1st to n/2th as well as adjacent ones of the (n+1)/2 th to n th ones of said first plurality n of adjacent resonators. - View Dependent Claims (2, 3)
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4. A dual hybrid mode dielectric resonator band pass filter, comprising:
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a tubular enclosure including a plurality of cascade coupled ceramic dielectric-loaded disk resonators, wherein each of said resonators is spaced from each other and coaxially supported in said tubular enclosure; means for exciting said resonators in said tubular enclosure so as to provide dual hybrid modes, said means for exciting including first and second probes fixed to and penetrating into said enclosure for providing input and output ports, coupling means for providing cross coupling of two orthogonal modes of each resonator, wherein said probes couple the radial electric fields of said two orthogonal modes of said resonators and wherein the depth of penetration into said enclosure and the thickness of said probe is proportional to the amount of coupling of said dual modes; and wherein the cascade coupling of said cascade coupled ceramic resonators between any two resonators is determined by the spacing between said any two disk resonators. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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12. A microwave band pass filter comprising:
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a plurality of dielectric ceramic disks resonators coaxially placed in a cylindrical metallic tube; first and second coaxial connectors having center conductors extending inside of said metallic tube wherein said coaxial connectors serve as input and output ports of said filter; a first set of tuning screws provided to adjust the resonant frequency of one set of resonant modes; a second set of tuning screws provided to adjust the resonant frequencies of an orthogonal set of resonant modes of said dielectric resonators; a third set of screws placed midway between adjacent resonators in order to couple the energy between the resonant modes in one direction; a fourth set of screws placed midway between adjacent resonators for controlling the coupling of energy between the resonant modes in the orthogonal set of resonant modes; and wherein said input and output ports are associated with different ones of said resonators.
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Specification