Patent ID: 7872876

Claim:
A printed circuit board (PCB), comprising: a circuit board body; a multi-layered substrate disposed on the circuit board body, the multi-layered substrate including a plurality of signal lines and a first ground voltage plate interposed between the plurality of signal lines and the circuit board body wherein the circuit board body, signal lines and first ground voltage plate are like those of a PCB having a microstrip line; thermal interface material disposed directly on the signal lines of the multi-layered substrate; and a heat sink of electrically conductive material disposed on the thermal interface material, wherein the heat sink dissipates heat generated by the multi-layered substrate and suppresses electromagnetic interference between signals transmitted through adjacent ones of the plurality of signal lines, the thermal interface material transfers heat from the multi-layered substrate to the heat sink, and the impedance of the plurality of signal lines is tuned by the thermal interface material.