Patent ID: 8258408

Claim:
An EMI noise reduction printed circuit board, having an electromagnetic bandgap structure with band stop frequency properties inserted into an inner portion of the board, the EMI noise reduction printed circuit board being a multi-layered printed circuit board, the EMI noise reduction printed circuit board comprising: a first area, in which a ground layer and a power layer are formed; and a second area placed on a side surface of the first area, the second area having the electromagnetic bandgap structure formed therein so as to shield an EMI noise radiated to the outside of the board through the side surface of the first area, wherein the electromagnetic bandgap structure comprises: a plurality of first conductive plates placed along the side surface of the first area; a plurality of second conductive plates disposed on a planar surface that is different from the first conductive plates such that the second conductive plates are alternately disposed with the first conductive plates; and a via configured to connect the first conductive plates to the second conductive plates.