Patent ID: 8102219
Filing Date: 2012-01-24
Classification: H05K

Abstract:
1. A printed circuit board in which an electromagnetic bandgap structure is disposed in an area of a noise transferable path between a noise source point and a noise blocking destination point of the printed circuit board, the electromagnetic bandgap structure comprising: a dielectric layer; a plurality of conductive plates placed on a planar surface which is different from that of the dielectric layer; vias, each of the vias being connected to each of the conductive plates and penetrating through the dielectric layer from one end part that is connected to the conductive plates; a conductive trace connecting the other end parts of the vias with each other such that all of the conductive plates are electrically connected; and a conductive layer interposed between the conductive plates and the dielectric layer, wherein the other end part of the via and the conductive trace are accommodated in a clearance hole formed in the conductive layer such that each of the conductive plates and the conductive layer can be electrically separated from each other, wherein the conductive layer is one of a ground layer and a power layer, and the conductive plates are electrically connected to the other of the ground layer and the power layer.