Patent ID: 8194412

Claim:
A printed circuit board (PCB) comprising: a signal plane comprising a pad, a passive element mounted on the pad, and a signal transmission line electrically connected to the passive element via the pad; and a reference plane to provide a return path for a signal transmitted through the passive element and the signal transmission line, wherein a void is defined in the reference plane corresponding to the passive element, to increase a length of the return path, a length of a first axis, perpendicular to the signal transmission line, of the void satisfies a following equation: W 1 ≈ 8 ⁢ Wpad + 10 ⁢ T 0.8 ⁢ Wtrace + T , wherein Wpad is a width of the pad, Wtrace is a width of the signal transmission line, T is the height of the pad.