Patent ID: 6444922
Filing Date: 2002-09-03
Classification: H05K

Abstract:
A printed wiring board (PWB) comprising a substrate formed of at least one layer of dielectric material having two opposite major surfaces, at least one signal line embedded in the layer and extending generally parallel to the two major surfaces, a first one of the major surfaces being planar and supporting a ground plane, a second one of the major surfaces having at least one groove extending only partially through the PWB and at least partially towards the first major surface and running substantially parallel to the signal line, and a conductive coating on the second major surface and extending into the at least one groove thereby to provide at least partial e.m.i. shielding for the at least one signal line, wherein the at least one signal line is located proximate an edge of the layer and extends substantially parallel to the edge, the groove being located on a side of the signal line remote from the edge, the conductive coating extending over the edge.