Patent ID: 6949991
Filing Date: 2005-09-27
Classification: H01P,H05K

Abstract:
1. A method for shielding a signal conductor in a multi-layer substrate, the method comprising: laminating a conductive reference layer, a first dielectric layer, a signal conductor, a second dielectric layer, and a conductive layer, respectively; forming trenches in the conductive reference layer, the first dielectric layer and the second dielectric layer so as to expose portions of the conductive layer, the trenches having sidewalls spaced away from opposing sides of the signal conductor; and applying a conductive material over at least a portion of the conductive reference layer and along the sidewalls of the trenches so as to form a conductive shield substantially enclosing the signal conductor, at least a portion of the conductive reference layer, at least a portion of the first dielectric layer, and at least a portion of the second dielectric layer, such that the signal conductor is shielded by the conductive shield on four sides and separated from the conductive shield by the enclosed portion of the conductive reference layer, the enclosed portion of the first dielectric layer and the enclosed portion of the second dielectric layer.