Importance

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Abstract

A planar filter assembly 12 is comprised of a generally planar inductive member 14 having upper and lower surfaces 16, 18 and a plurality of terminal receiving apertures 22 extending therethrough and a plurality of pairs of capacitors 44, 46, one capacitor pair being at respective ends of each aperture 22; whereby each the pair of capacitors 44, 46 and said inductive member therebetween forms a pi-network filter for an electrical terminal member 48 inserted into aperture 22. The capacitors 44, 46 are formed on the upper and lower surfaces 16, 18 of the inductive member by disposing a series of layers of materials on the surfaces. The first layer 24 comprises an electrically-conductive material disposed on first selected locations of upper and lower surfaces 16, 18, the first conductive coating being spaced from apertures 22 and including the ground electrode portions 25 for the capacitors 44, 46. A dielectric layer 30 is disposed on the first conductive layer 24, the dielectric layer 24 extending to the edge of the apertures 22. A second electrically conductive layer 36 is disposed on dielectric layer 30 at isolated second selected locations on the upper and lower surfaces 16, 18 to form contact pads comprising signal electrodes 38. The combination of ground electrode, portion 25 dielectric layer 30 and signal electrode forms the capacitors 44, 46 at respective ends of each aperture 22 and the combination of capacitor-inductor-capacitor forms a pi-network filter for an electrical terminal member 48 inserted into the aperture 22.

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First Claim