Ceramic band-pass filter
First Claim
Patent Images
1. A filter comprising:
- a body of dielectric material having (a) first and second surfaces on opposite sides of the body, (b) at least two side surfaces generally orthogonal to the first and second surfaces and connecting the edges of the first and second surfaces to each other, and (c) two end surfaces connecting the ends of the first, second and side surfaces to each other;
said body defining at least one hole with an interior surface which extends into said body from said first surface toward said second surface;
a conductive layer covering major portions of the second surface, one side surface of said body, both end surfaces, and the interior surface of said hole so as to form at least one transmission line resonator, the other side surface being generally free of said conductive layer; and
an electrically-conductive electrode pattern means located on the other side surface of said body for providing electrical signal coupling to and from the transmission line resonator by creating a field that penetrates the uncoated other side surface of the body to the interior surface of the hole, the coupling varying from (a) capacitive to (b) mixed capacitive and inductive to (c) inductive, depending on the relative location of the pattern means on the side surface between areas adjacent the first surface to areas adjacent the second surface, respectively.
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Abstract
A dielectric filter is formed from a block of ceramic material with holes extending from a top surface toward a bottom surface. At least the bottom, both ends and one side surface are coated with conductive material. Also, the interior surfaces of the holes are coated with conductive material to form transmission line resonators. The uncoated side surface has an electrode pattern which allows coupling to the filter and between resonators of the filter. The elevation of the electrodes on the side surface between the top and bottom determines whether the coupling is capacitive, mixed inductive and capacitive, or inductive.
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Citations
37 Claims
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1. A filter comprising:
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a body of dielectric material having (a) first and second surfaces on opposite sides of the body, (b) at least two side surfaces generally orthogonal to the first and second surfaces and connecting the edges of the first and second surfaces to each other, and (c) two end surfaces connecting the ends of the first, second and side surfaces to each other; said body defining at least one hole with an interior surface which extends into said body from said first surface toward said second surface; a conductive layer covering major portions of the second surface, one side surface of said body, both end surfaces, and the interior surface of said hole so as to form at least one transmission line resonator, the other side surface being generally free of said conductive layer; and an electrically-conductive electrode pattern means located on the other side surface of said body for providing electrical signal coupling to and from the transmission line resonator by creating a field that penetrates the uncoated other side surface of the body to the interior surface of the hole, the coupling varying from (a) capacitive to (b) mixed capacitive and inductive to (c) inductive, depending on the relative location of the pattern means on the side surface between areas adjacent the first surface to areas adjacent the second surface, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 21, 22, 23)
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14. A band-pass filter comprising:
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a body of dielectric material having first and second surfaces on opposite sides of the body from each other, end surfaces and side surfaces; said body defining at least two holes extending from the first surface toward the second surface; a conductive coating on said second, end and one side surfaces as well as the interior surfaces of the holes, to form at least two transmission line resonators the other side surface being generally free of said conductive coating; an insulating plate having first and second surfaces with the first surface against the other side surface of the body; and a conductive electrode pattern on the insulating plate for coupling between said two resonators, the electrode pattern providing coupling between the at least two resonators by creating a field that penetrates the uncoated other side of the body to the interior surface of the hole, said coupling being capacitive, mixed capacitive-inductive and inductive depending on whether the pattern is near and thereby closer to the first surface than to the second surface, or more equidistant between the first and second surfaces or near and thereby closer to the second surface than to the first surface, respectively. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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24. A duplexer filter for a radio having an antenna, a transmitter and a receiver, comprising:
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first and second blocks of dielectric material, each block having first and second surfaces on opposite sides from each other, end surfaces and side surfaces;
each block defining at least one hole extending from the first surface to the second surface;a conductive coating over the second surface, end surfaces and one side surface, as well as over the interior of the hole of each block, so as to form at least one transmission line resonator in each block the other side surface being generally free of the conductive coating; a conductive electrode pattern on the other side surface of each block for coupling directly to and from the resonator through the dielectric in each block by means of fields created at the electrodes that penetrate the other side surface and extend to the hole, the coupling varying from capacitive, to mixed capacitive-inductive, to inductive as the pattern is located respectively on the other side surface near and thereby closer to the first surface than to the second surface, to more equidistant between the first and second surfaces, to nearer and thereby closer to the second surface than to the first surface and connecting means for connecting the first block between the transmitter and the antenna, and for connecting the second block between the receiver and the antenna. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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31. A filter comprising:
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first and second blocks of dielectric material, each block having first and second surfaces on opposite sides from each other, end surfaces and side surfaces;
each block defining one hole extending from the first surface to the second surface;a conductive coating over the second surface, end surfaces and one side surface, as well as over the interior of the hole of each block, so as to form one transmission line resonator in each block the other side surface being substantially free of the conductive coating; conductive electrode patterns on the other side surface of each block for coupling to and from the resonator in each block by means of fields created by signals on the electrode patterns that penetrate the other side surface and extend to the hole, the coupling varying from capacitive, to mixed capacitive-inductive, to inductive as the pattern is located respectively on the other side surface near and thereby closer to the first surface than to the second surface, to more equidistant between the first and second surfaces, to nearer and thereby closer to the second surface than to the first surface; and connecting means for connecting the first block to the second block between the receiver and the antenna.
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32. A bandpass filter, comprising:
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a body of dielectric material having a plurality of surfaces including two opposite surfaces and a side surface extending between said two opposite surfaces, said body defining at least one hole with an interior surface which extends into said body from each of said two opposite surfaces; resonator means for producing at least one transmission line resonator, said resonator means including a conductive layer covering portions of at least some of said plurality of surfaces and an interior surface of said hole; means for providing electrical signal coupling to and from said resonator means, said providing means including an electrically-conductive electrode pattern means on said side surface which varies said coupling from capacitive to mixed capacitive and inductive to inductive, depending on a relative location of the pattern means on the side surface between areas of said side surface adjacent to said two opposite surfaces; an electrically conductive plate spaced from said pattern means so as to define a gap therebetween which determines a bandwidth; and means for coupling said plate to said interior surface of said hole. - View Dependent Claims (33, 34, 35, 36, 37)
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Specification