A printed circuit board includes a first layer including a first power
portion and a first ground portion isolated from each other, and a second
layer including a second power portion and a second ground portion
isolated from each other. The second layer is spaced from the first
layer. The second ground portion is arranged below the first power
portion. The second power portion is arranged below the first ground
portion. One portion of the first power portion overlaps one portion of
the second power portion, and one portion of the first ground portion
overlaps one portion of the second ground portion to provide a
zero-intensity electric field between the first layer and the second
layer. The first power portion is coupled to the second power portion via
a first via. The first ground portion is coupled to the second ground
portion via a second via.