Patent ID: 8711055
Filing Date: 2014-04-29
Classification: H01L,H01Q

Abstract:
1. A printed circuit board, comprising: an antenna; a circuit chip; a plurality of metal layers and a plurality of dielectric layers; a pair of transmission lines for transmitting a signal to the antenna; and an electromagnetic bandgap structure disposed between the antenna and the circuit chip in the printed circuit board and for preventing an electromagnetic wave from being transmitted from the circuit chip to the antenna, wherein one of the pair of transmission lines is formed in a first metal layer of the plurality of metal layers so as to transmit the signal to the antenna, and the electromagnetic bandgap structure comprises a plurality of metal plates spaced apart from the one of the pair of transmission lines in a direction of the antenna; and a plurality of vias for connecting the one of the pair of transmission lines and the metal plates to each other, in which sets of the metal plates and the vias are periodically arranged at a predetermined interval, and wherein the other of the pair of transmission lines is formed in a second metal layer of the plurality of metal layers which is spaced apart from the first metal layer in a direction of the antenna, and the metal plates are formed in the second metal layer.