Patent ID: 7492234
Filing Date: 2009-02-17
Classification: H05K

Abstract:
1. A printed circuit board (PCB) comprising: at least one signal layer; a ground layer; at least two signal lines arranged on the at least one signal layer for transmitting signals; and at least one grounded line arranged on the at least one signal layer and between the at least two signal lines, a plurality of vias defined in the at least one grounded line, the vias connected to the ground layer, a distance between each two adjacent vias being so arranged that a resonant frequency of an electromagnetic wave transmitted on the at least one grounded line is greater than a highest frequency of the signals transmitted on the at least two signal lines; wherein distances of every two adjacent vias are equal, the distance of every two adjacent vias satisfies: where L is the distance of each two adjacent vias, Fb is a highest frequency of signals of the at least two signal lines, C is a velocity of electromagnetic waves in a vacuum, and ξ is a dielectric constant of the PCB.