Patent ID: 7378601

Claim:
A differential pair signal transmission structure suitable for a multi-layered circuit board having a core layer with a top surface, a bottom surface, a first through hole and a second through hole, wherein the first and the second through holes link the top surface with the bottom surface for transmitting a differential pair of signals, wherein the differential pair signal transmission structure comprising: a pair of first conductive vias; a pair of first via lands respectively connecting to one ends of the pair of first conductive vias on the top surface of the core layer to cover first ends of the first and the second through holes respectively; and a pair of conductive walls respectively located only on a portion of the inner wall of the first through hole and a portion of the inner wall of the second through hole such that the pair of conductive walls are respectively electrically connected to the pair of first conductive vias through the first via lands, wherein the pair of conductive walls are located away from each other and have a C-shaped sectional profile.