Teradyhe, Inc.

Ellen M Gately

Mark W Gailus

Robert A McGrath

A multi-layer printed circuit board includes a via having a conductive upper portion, a conductive lower portion, and an electrically insulating intermediate portion between the upper and lower portions. In one embodiment, the insulating intermediate portion of the via is provided by a non-platable layer of the circuit board, as may be comprised of PTFE. Vias having a continuous conductive coating may be formed through clearance holes in the non-platable layer which are provided with a platable inner surface, either by filling the hole with a platable material, such as epoxy resin, prior to laminating the board or by chemically conditioning the non-platable material to make it platable. In a further embodiment, the as insulating intermediate portion of the via has a narrower diameter than the conductive upper and lower portions.

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Merrimack, NH, United States of America

Ellen M Gately