Patent ID: 7291916

Claim:
A signal transmission structure, suitable for a multi-layer circuit substrate comprising a core layer and at least a dielectric layer, wherein the core layer comprises a first surface, a second surface, and at least a through hole conducting the first surface and the second surface, the signal transmission structure comprising: a first via landing pad disposed on the first surface of the core layer, wherein the first via landing pad electrically connects with one end of the through hole, and the dielectric layer covering the first via landing pad and the first surface of the core layer; and a first reference plane disposed on the dielectric layer, the first reference plane having a first opening disposed above one end of the through hole, and the area where the first reference plane is projected on the first surface of the core layer does not overlap with the area where the first via landing pad is projected on the first surface of the core layer, wherein the first reference plane is disposed above the first via landing pad.