Correlation between Insertion Loss and Interface Relative Conductivity

For high-speed signal transmission lines in printed wiring boards, a parameter is required to determine the insertion loss in the line. Surface relative conductivity (σr) is considered to be a promising option. However, surface σr cannot always be measured because of the surface treatment or semi-additive process used. In this report, we characterize the conditions of the interface conductor by the interface σr. The results show a strong correlation between insertion loss and interface or. Therefore, we consider interface or to be useful in characterizing the conductor interface conditions with respect to insertion losses.