Signal transmission loss on printed circuit board in GHz frequency region

Higher-speed signal transmission is strongly required on a printed circuit board to handle massive data in electronic systems. So, signal transmission loss of copper wiring on a printed circuit board has been studied First, total signal loss was divided into dielectric loss and conductor loss quantitatively based on electromagnetic theory. In particular, the scattering loss due to surface roughness of copper foil has been examined in detail And the usefulness of the copper foil with low surface roughness has been demonstrated