Patent ID: 7297877

Claim:
A substrate to which a laser technique is applied, comprising: a signal layer; a micro-via structure, including a first conductive column, including a first flat conductive layer, a first dielectric layer, and a first cambered conductive layer, wherein the first dielectric layer is enclosed between the first flat conductive layer and the first cambered conductive layer, a second conductive column, being opposite to the first conductive column and including a second flat conductive layer, a second dielectric layer, and a second cambered conductive layer, wherein the second dielectric layer is enclosed between the second flat conductive layer and the second cambered conductive layer, and a third dielectric layer, disposed between the first conductive column and the second conductive column, for electrically separating the first flat conductive layer and the second flat conductive layer; and a differential signal pair, disposed on the signal layer, including a first trace, electrically connected to one end of the first flat conductive layer, and a second trace, electrically connected to one end of the second flat conductive layer.