Patent ID: 8502085

Claim:
A multi-layer substrate comprising: a plurality of substrate main bodies; a plurality of layers alternately layered with the main bodies, the plurality of substrate main bodies and layers having a sub through-hole therein; a hollow sub column located around an inner circumference of the sub through-hole, the hollow sub column connected to at least one grounding line located in a same layer as at least one of the plurality of layers, the hollow sub column including a distance part or a through part such that the hollow sub-column does not contact at least one signal line located in a same layer as at least one of the plurality of layers, and the at least one grounding line located in a same layer as the at least one signal line passing the distance part or the through part, the at least one grounding line and the at least one signal line being arranged to get away from each other; a pair of sub pads extending from ends of the sub column to contact respective layers; a hollow signal column located within the hollow sub column to define a signal via hole, the signal column connected to the at least one signal line; and a supporter which connects the signal column and the sub column to hold the signal column within the sub column at a predetermined distance from the sub column, the supporter passing through the sub dielectric.