Patent ID: 7309917

Claim:
A multilayer board, comprising: an insulation material, a grounding layer formed in the insulation material, and inter-layer-connected by a grounding via, a signal layer formed in the insulation material, and inter-layer-connected by a signal via, a grounding land formed at the bottom surface of the insulation material, and connected to the grounding layer and to a terminal for an external connection, a signal land formed at the bottom surface of the insulation material, and connected to the signal layer and to a terminal for an external connection, the diameter of the signal land being W 1 , a plurality of grounding vias that are arranged near the circumference of the signal via, and a clearance for the signal land to pass through, which clearance is provided in a grounding layer that is nearest to the signal land, the diameter of the clearance W 2 being greater than W 1 .