Integrated Filter Feedthrough Assemblies Made From Low Temperature Co-Fired (LTCC) Tape
First Claim
1. A filter feedthrough capacitor, which comprises:
- a) a conductive ferrule comprising an annular sidewall having a ferrule opening extending axially along the ferrule sidewall from a first end to a second, opposite end thereof;
b) at least one conductive terminal pin;
c) an insulator having an outer sidewall hermetically sealed to an inner surface of the ferrule sidewall and comprising an insulator opening for passage of the terminal pin there through;
d) a filter capacitor mounted axially at one outer side of the insulator and having a central opening formed therein for pass-through reception of the terminal pin, wherein the capacitor comprises;
i) a planar substrate having an opening for passage of the terminal pin there through and an annular outer edge residing adjacent to the inner surface of the ferrule sidewall;
ii) at least a first electrode layer of an electrically conductive material supported on the substrate having a first edge terminating immediately adjacent to the terminal pin bore;
iii) a first dielectric layer covering at least a portion of the first electrode layer and having opposed ends spaced from the terminal pin bore and the outer edge of the substrate, respectively; and
iv) at least a second, opposite polarity electrode layer of an electrically conductive material supported on the substrate and having a second edge terminating immediately adjacent to the outer edge of the substrate; and
e) a conductive material providing electrical conductivity from one of the first and second electrode layers to the terminal pin and from the other of the first and second electrode layers to the ferrule.
1 Assignment
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Accused Products
Abstract
A filter capacitor comprising a substrate of at least one layer of a low temperature co-fires ceramic (LTCC) tape supporting alternating active and ground electrode layers segregated by a dielectric layer is described. The substrate is preferably a laminate of three LTCC tapes pieces that are heated under pressure and at a relatively low temperature to become a laminate that maintains its shape and structure dimensions even after undergoing numerous sintering steps. Consequently, relatively thin active and ground electrode layers along with the intermediate dielectric layer can be laid down or deposited on the LTCC substrate by a screen-printing technique. A second laminate of LTCC tapes is positioned on top of the active/dielectric/ground layers to finish the capacitor. Consequently, a significant amount of space is saved in comparison to a comparably rated capacitor or, a capacitor of a higher rating can be provided in the same size as a conventional prior art capacitor.
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Citations
49 Claims
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1. A filter feedthrough capacitor, which comprises:
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a) a conductive ferrule comprising an annular sidewall having a ferrule opening extending axially along the ferrule sidewall from a first end to a second, opposite end thereof; b) at least one conductive terminal pin; c) an insulator having an outer sidewall hermetically sealed to an inner surface of the ferrule sidewall and comprising an insulator opening for passage of the terminal pin there through; d) a filter capacitor mounted axially at one outer side of the insulator and having a central opening formed therein for pass-through reception of the terminal pin, wherein the capacitor comprises; i) a planar substrate having an opening for passage of the terminal pin there through and an annular outer edge residing adjacent to the inner surface of the ferrule sidewall; ii) at least a first electrode layer of an electrically conductive material supported on the substrate having a first edge terminating immediately adjacent to the terminal pin bore; iii) a first dielectric layer covering at least a portion of the first electrode layer and having opposed ends spaced from the terminal pin bore and the outer edge of the substrate, respectively; and iv) at least a second, opposite polarity electrode layer of an electrically conductive material supported on the substrate and having a second edge terminating immediately adjacent to the outer edge of the substrate; and e) a conductive material providing electrical conductivity from one of the first and second electrode layers to the terminal pin and from the other of the first and second electrode layers to the ferrule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 18, 19, 20, 21)
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16. A filter feedthrough capacitor, which comprises:
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a) a conductive ferrule comprising an annular sidewall having a ferrule opening extending axially along the ferrule sidewall from a first end to a second, opposite end thereof; b) at least one conductive terminal pin; c) an insulator having an outer sidewall hermetically sealed to an inner surface of the ferrule sidewall and comprising an insulator opening for passage of the terminal pin there through; d) a filter capacitor mounted axially at one outer side of the insulator and having a central opening formed therein for pass-through reception of the terminal pin, wherein the capacitor comprises; i) a planar substrate of at least one first layer of a low temperature co-fired ceramic (LTCC) tape having an opening for passage of the terminal pin there through and an annular outer edge residing adjacent to the inner surface of the ferrule sidewall; ii) at least two first active electrode layers of an electrically conductive material contacting each other adjacent to the terminal pin bore and supported there by the substrate; iii) a dielectric layer covering at least a portion of each of the first active electrode layers and having opposed ends extending to the terminal pin bore and the outer edge of the substrate; and iv) at least two second ground electrode layers of an electrically conductive material segregated from the active electrode layers by the dielectric layer, the ground electrode layers contacting each other adjacent to the outer edge of the substrate and supported there by the substrate; and e) a conductive material providing electrical conductivity from the active electrode layer to the terminal pin and from the ground electrode layer to the ferrule.
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17. A filter capacitor, which comprises:
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a) a planar substrate of a non-conductive material having an opening for passage of at least one terminal pin there through and an annular outer edge; b) at least a first active electrode layer of an electrically conductive material supported on the substrate having a first edge terminating immediately adjacent to the terminal pin bore; c) a first dielectric layer covering at least a portion of the first active electrode layer and having opposed ends spaced from the terminal pin bore and the outer edge of the non-conductive substrate, respectively; and d) at least a second ground electrode layer of an electrically conductive material supported on the non-conductive substrate and having a second edge terminating immediately adjacent to the outer edge of the non-conductive substrate, wherein the active electrode layer is electrically connectable to a terminal pin and the ground electrode layer is electrically connectable to a conductive substrate. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for providing filter capacitor assembly, comprising the steps of:
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a) providing a planar substrate; b) screen-printing at least a first electrode layer of an electrically conductive material on the substrate; c) screen-printing a first dielectric layer covering at least a portion of the first electrode layer and having opposed ends spaced from an intended location of a terminal pin bore and an intended location of an outer edge of the substrate, respectively; d) screen-printing at least a second, opposite polarity electrode layer of an electrically conductive material on the substrate, the second electrode layer having a second edge terminating immediately adjacent to the outer edge of the substrate; and e) cutting the substrate to provide an opening for passage of a terminal pin there through and an annular outer edge. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification