Filter with stepped impedance resonators and method of making the filter
First Claim
Patent Images
1. A filter comprising:
- first and second resonators, wherein said resonators are stepped impedance resonators including a high impedance portion connected to a low impedance portion, wherein said high impedance portions are integral with a housing, and wherein said high impedance portions are plastic and include a coating of conductive film; and
a coaxial cable including an inner conductor connected to said first resonator and an outer conductor connected to said second resonator.
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Abstract
A filter including first and second resonators and a coaxial cable connecting the resonators. Also, a filter including a housing and stepped impedance resonators wherein the high impedance portions of the stepped resonators are integral with the housing. Also, methods of manufacturing the filters.
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Citations
53 Claims
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1. A filter comprising:
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first and second resonators, wherein said resonators are stepped impedance resonators including a high impedance portion connected to a low impedance portion, wherein said high impedance portions are integral with a housing, and wherein said high impedance portions are plastic and include a coating of conductive film; and
a coaxial cable including an inner conductor connected to said first resonator and an outer conductor connected to said second resonator. - View Dependent Claims (2, 3, 4)
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5. A filter, comprising:
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a housing defining at least one cavity;
a plurality of stepped impedance resonators, each said stepped impedance resonator including a high impedance portion integral with said housing, and a low impedance portion connected to said high impedance portion, wherein one of said stepped impedance resonators is disposed in said cavity;
at least one coaxial cable capacitively coupling two of said plurality of stepped impedance resonators, wherein said coaxial cable has an inner conductor connected to a first stepped impedance resonator and an outer conductor connected to a second stepped impedance resonator; and
at least one spacer of dielectric material in said cavity between said housing and said stepped impedance resonator disposed in said cavity. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
said high impedance portion and said housing are plastic and include a coating of conductive film.
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7. The filter of claim 5, further comprising a cover connected to said housing.
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8. The filter of claim 5, wherein said cavity contains dielectric material with a loss tangent less than 0.05.
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9. The filter of claim 8, wherein said dielectric material is selected from the group consisting of air, polystyrene, polyphenylene oxide, polyphenylene sulfide, fluoropolymer resin, and alumina.
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10. The filter of claim 5, wherein said spacer is a fluoropolymer resin.
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11. The filter of claim 5, wherein said spacer is polystyrene.
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12. The filter of claim 5, wherein said spacer is a rod.
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13. The filter of claim 5, wherein said spacer is a ring.
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14. The filter of claim 5, wherein said low impedance portion is a metal selected from the group consisting of copper, alloyed copper, and aluminum.
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15. A filter, comprising:
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a housing;
first and second stepped impedance resonators, each said stepped impedance resonator including a high impedance portion integral with said housing, and a low impedance portion connected to said high impedance portion, wherein said low impedance portion includes an inner surface and an outer surface, wherein said inner surface of said low impedance portion defines a cavity, and wherein said high impedance portion is connected to said outer surface of said low impedance portion; and
a coaxial cable including an inner conductor connected to said low impedance portion of said first stepped impedance resonator and an outer conductor connected to said low impedance portion of said second stepped impedance resonator.
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16. A filter, comprising:
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a housing; and
a plurality of stepped impedance resonators, each said stepped impedance resonator including a high impedance portion integral with said housing, and a low impedance portion connected to said high impedance portion, wherein said high impedance portion and said housing are plastic and include a conductive film. - View Dependent Claims (17, 18, 19)
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20. A filter, comprising:
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a housing defining a cavity;
a plurality of stepped impedance resonators, each said stepped impedance resonator including a high impedance portion integral with said housing, and a low impedance portion connected to said high impedance portion, wherein one of said stepped impedance resonators is disposed in said cavity;
a cover connected to said housing; and
at least one dielectric spacer in said cavity between said housing and said stepped impedance resonator disposed in said cavity. - View Dependent Claims (21, 22)
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23. A filter, comprising:
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a housing defining at least one cavity;
a plurality of stepped impedance resonators, each said stepped impedance resonator including a high impedance portion integral with said housing, and a low impedance portion connected to said high impedance portion, wherein a first of said plurality of stepped impedance resonators is disposed in said cavity; and
at least one dielectric spacer disposed in said cavity between said housing and said first stepped impedance resonator. - View Dependent Claims (24, 25, 26)
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27. A method of manufacturing a filter, comprising:
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forming a housing and a high impedance portion of a stepped impedance resonator as an integral piece;
fastening a low impedance portion of said resonator to said high impedance portion; and
coating the housing and the high impedance portion with a conductive film. - View Dependent Claims (28, 29, 30)
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31. A method of manufacturing a filter, comprising:
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forming from plastic a housing and a plurality of high impedance portions of stepped impedance resonators as an integral piece;
fastening a plurality low impedance portions of said stepped impedance resonators to said plurality of high impedance portions; and
capacitively coupling said stepped impendance resonators. - View Dependent Claims (32, 33, 34, 35)
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36. A dielectric loaded filter, comprising:
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a housing;
first and second stepped impedance resonators, wherein each of said stepped impedance resonators includes a high impedance portion connected to a low impedance portion, and wherein each of said high impedance portions is integral with said housing;
a first dielectric having a loss tangent less than 0.05 disposed between said first stepped impedance resonator and said housing; and
a second dielectric having a loss tangent less than 0.05 disposed between said second stepped impedance resonator and said housing. - View Dependent Claims (37, 38, 39, 40, 41)
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42. A filter, comprising:
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a housing;
a plurality of stepped impedance resonators, each said stepped impedance resonator including a high impedance portion integral with said housing, and a low impedance portion connected to said high impedance portion, wherein said high impedance portion and said housing are plastic and include a coating of conductive film; and
at least one coaxial cable capacitively coupling two of said plurality of stepped impedance resonators, wherein said coaxial cable has an inner conductor connected to a first stepped impedance resonator and an outer conductor connected to a second stepped impedance resonator.
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43. A method of manufacturing a filter, comprising:
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forming from plastic a housing and a high impedance portion of a stepped impedance resonator as an integral piece;
fastening a low impedance portion of said resonator to said high impedance portion.
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44. A filter, comprising:
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first and second stepped impedance resonators, each said stepped impedance resonator including a low impedance portion connected to a high impedance portion, wherein said low impedance portion includes an inner surface and an outer surface, wherein said inner surface of said low impedance portion defines a cavity, and wherein said high impedance portion is connected to said outer surface of said low impedance portion; and
a coaxial cable including an inner conductor connected to said low impedance portion of said first stepped impedance resonator and an outer conductor connected to said low impedance portion of said second stepped impedance resonator. - View Dependent Claims (45, 46, 47, 48)
a housing defining a cavity, wherein said first stepped impedance resonator is disposed in said housing; and
a dielectric spacer disposed in said cavity between said housing and said first stepped impedance resonator.
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48. The filter of claim 47, wherein said housing defines a second cavity, and wherein said second stepped impedance resonator is disposed in said second cavity, and further comprising a second dielectric spacer disposed in said second cavity between said housing and said second stepped impedance resonator.
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49. A filter, comprising:
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first and second stepped impedance resonators, each said stepped impedance resonator including a low impedance portion connected to a high impedance portion, wherein said low impedance portion includes an inner surface and an outer surface, wherein said inner surface of said low impedance portion defines a cavity, and wherein said high impedance portion is connected to said outer surface of said low impedance portion; and
a trimmer capacitor connected between said first and second stepped impedance resonators. - View Dependent Claims (50, 51, 52, 53)
a housing defining a cavity, wherein said first stepped impedance resonator is disposed in said housing; and
a dielectric spacer disposed in said cavity between said housing and said first stepped impedance resonator.
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53. The filter of claim 52, wherein said housing defines a second cavity, and wherein said second stepped impedance resonator is disposed in said second cavity, and further comprising a second dielectric spacer disposed in said second cavity between said housing and said second stepped impedance resonator.
Specification