Patent ID: 7253363

Claim:
A circuit board comprising: a base member, a first interconnect layer formed on a part of the base member, an electrically-floating conductive layer formed on a substantially remaining part of the base member and having an edge adjacent to an edge of the first interconnect layer, a dielectric layer covering a part of the first interconnect layer and an entire surface of the electrically-floating conductive layer and filling a gap between the edge of the first interconnect layer and the edge of the electrically-floating conductive layer, a second interconnect layer formed on the dielectric layer, a bottom interconnect layer arranged on an opposite side of the base member and including a land, and a further electrically-floating conductive layer arranged on the opposite side of the base member and having an edge adjacent to an edge of the bottom interconnect layer, wherein a combined volume of the bottom interconnect layer and the further electrically-floating conductive layer is substantially equal to a combined volume of the first interconnect layer and the electrically-floating conductive layer.