Patent ID: 7432575
Filing Date: 2008-10-07
Classification: G02B,H01L,H05K

Abstract:
1. A circuitry substrate comprising: a conductive return plane having a device attachment area; a dielectric sheet of dielectric material having a top surface and a bottom surface, the bottom surface being attached to the return plane, wherein the dielectric sheet does not cover the device attachment area and wherein the dielectric sheet includes an inner edge that borders the device attachment area and has an outer edge distal from the device attachment area; and a plurality of signal lines and return paths formed on the top surface of the dielectric sheet, at least one return path extending between an adjacent pair of signal lines, whereby the return paths electrically shield the adjacent pair of signal lines from each other and wherein the return paths extend from the inner edge of the dielectric sheet to the outer edge of the dielectric sheet and wherein each return path wraps around at least one edge of the dielectric sheet to make electrical contact with the return plane whereby the return paths extend along the length of the signal lines and between the signal lines.