Patent ID: 8050044

Claim:
A power plane, used for providing a dc potential and filtering out the noises on the power plane, comprising: a first circuit region, wherein the length of the first circuit region is related to the noise frequency that the power plane is designed to filter out; and a second circuit region coupled to the first circuit region, wherein the length of the second circuit region is related to the noise frequency to be filtered out, and the width of the second circuit region is unequal to the width of the first circuit region, wherein the length of the first circuit region is equal to the length of the second circuit region, wherein the lengths of the first circuit region and the second region are L=Vp/4f√{square root over ( )}(∈ eff ), where L represents the length of the first circuit region and the second circuit region, Vp represents the phase velocity, f represents the noise frequency, and ∈ eff represents the effective dielectric constant of the first circuit region and the second circuit region.