| 摘要 |
A via structure of a printed circuit board includes an insulation layer having a first surface and a second surface, a through-hole and a plurality of internal conducting coatings. The through-hole is throughout the first surface and the second surface of the insulation layer and the internal conductive coatings connected to a wall of the through-hole are mutually electrically insulated so that different signals can be transmitted between both sides of the substrate through a single via.
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