Ceramic band-stop filter
First Claim
1. A band-stop filter, comprising;
- a plurality of resonators, each of the resonators being composed of a portion of dielectric material having top, bottom and at least two side surfaces with a respective hole extending from said top surface to said bottom surface, the portion of dielectric material for each resonator being adjacent each other along dividing lines, the top, bottom and at least a first side surface being generally covered with an electrically conducting material, a second side surface being at most partially covered with electrically conductive material; and
conductive strip means for substantially cancelling out electric and magnetic fields between said resonators, said conductive strip means including at least one conductive strip located at a respective one of the dividing lines on the second side surface and extending generally straightly between the conductive material on the top and bottom surfaces, said conductive strip being elongated in a direction parallel to a direction of elongation of the resonator hole.
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Accused Products
Abstract
In order to provide a sufficient isolation between the resonators of a band-stop filter, prior art band-stop filters must be manufactured from separate ceramic resonator blocks. According to the invention the band-stop filter can be manufactured in a single ceramic block (1), having on one side surface strip-like areas (14; 15) of electrically conducting material extending perpendicularly from the bottom edge to the top edge and being located in the area between the resonators (A and B, B and C) and having dimensions selected so that they substantially cancel the electric and magnetic field between the resonators. If necessary, the coupling between the resonators can be adjusted by changing the width of the strip-like areas (14; 15) or by providing them with discontinuities.
87 Citations
14 Claims
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1. A band-stop filter, comprising;
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a plurality of resonators, each of the resonators being composed of a portion of dielectric material having top, bottom and at least two side surfaces with a respective hole extending from said top surface to said bottom surface, the portion of dielectric material for each resonator being adjacent each other along dividing lines, the top, bottom and at least a first side surface being generally covered with an electrically conducting material, a second side surface being at most partially covered with electrically conductive material; and conductive strip means for substantially cancelling out electric and magnetic fields between said resonators, said conductive strip means including at least one conductive strip located at a respective one of the dividing lines on the second side surface and extending generally straightly between the conductive material on the top and bottom surfaces, said conductive strip being elongated in a direction parallel to a direction of elongation of the resonator hole. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A ceramic band-stop filter, comprising;
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a plurality of resonators each composed of a portion of dielectric material having top, bottom and at least two side surfaces with a respective hole extending from said top surface to said bottom surface, said top, bottom and at least a first of the side surfaces being at least partly covered with an electrically conducting material, a second of said side surfaces being at most partially covered with electrically conductive material and which has elongated top and bottom edges; and conductive strip means for affecting coupling between adjacent ones of said resonators, said second side surface having respective locations which coincide with projections of said holes onto said second side surface, said conductive strip means being located between and spaced from said respective locations, said conductive strip means including at least one conductive strip extending generally straightly from the top edge to the bottom edge of said second side surface and which is elongated in a direction perpendicular to a direction of elongation of said top and bottom edges, said conductive strip means having a discontinuity whose length affects the coupling between said adjacent resonators. - View Dependent Claims (10)
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11. A ceramic band-stop filter, comprising;
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a plurality of resonators each composed of a portion of dielectric material having top, bottom and at least two side surfaces with a respective hole, extending from said top surface to said bottom surface, said top, bottom and at least a first of the side surfaces being at least partly covered with an electrically conducting material, a second of said side surfaces being at most partially covered with electrically conductive material and which has elongated top and bottom edges; and conductive strip means for affecting coupling between adjacent ones of said resonators, said second side surface having respective locations which coincide with projections of said holes onto said second side surface, said conductive strip means being arranged spaced from and between said respective locations, said conductive strip means including at least one conductive strip extending generally straightly from the top edge to the bottom edge and which is elongated in a direction perpendicular to a direction of elongation of said top and bottom edges, said conductive strip means including a conductive strip that has a width which affects the coupling between said adjacent resonators and being narrower than that necessary for cancelling an electric and magnetic field between said adjacent resonators. - View Dependent Claims (12)
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13. A ceramic band-stop filter, comprising;
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a plurality of resonators each composed of a portion of dielectric material having top, bottom and at least two side surfaces with a respective hole extending from said top surface to said bottom surface, said top, bottom and at least a first of the side surfaces being at least partly covered with an electrically conducting material, a second of said side surfaces being at most partially covered with electrically conductive material and which has elongated top and bottom edges; and conductive strip means for substantially cancelling out electric and magnetic fields between said resonators, said second side surface having respective locations which coincide with projections of said holes onto said second side surface, said conductive strip means being located between and spaced from said respective locations, said conductive strip means including at least one conductive strip extending generally straightly from the top edge to the bottom edge of said second side surface and which is elongated in a direction perpendicular to a direction of elongation of said top and bottom edges, said conductive strip means having a discontinuity whose length affects the coupling between said adjacent resonators elongation of said top and bottom edges. - View Dependent Claims (14)
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Specification