Patent ID: 8411460
Filing Date: 2013-04-02
Classification: H05K

Abstract:
1. A printed circuit board (PCB) comprising: a ground layer; a first signal layer; and a backboard; wherein the backboard is arranged below the first signal layer, a plurality of vias is formed on the backboard and equidistantly arranged along peripheral edges of the backboard, the plurality of vias extend through the first signal layer and are connected to the ground layer for anti-EMI, and further comprising a second signal layer and a power layer, wherein the power layer is sandwiched between the second signal layer and the ground layer, the first signal layer is arranged below the ground layer opposite to the power layer, the backboard is arranged below the first signal layer opposite to the ground layer; wherein a distance S of each two vias of the plurality of vias is described as: S<C/(20*f*Er