Development of a PTFE Printed Circuit board that is used in High-Frequency Devices of Terahertz band

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Electroless copper plating on resin substrates has been studied as method for producing flexible printed circuit boards [PCB] . For increased speed of future high-frequency electronics devices, resin substrate having a characteristic of low dielectric loss is necessary. Polytetrafluoroethylene [PTFE] is the most ideal material among resins. However, the adhesion strength between copper layers and PTFE surface is greatly weak, because the PTFE surface is low surface free energy. Therefore, surface modification of PTFE has been required. Furthermore, in order to reduce the signal interconnection delay, it is necessary to keep the smooth PTFE surface.In this study, we tried to modify the PTFE surface by combination of atmospheric-pressure plasma [APP] treatment and coating formation of surface modification. Then, it was possible to improve the adhesion of PTFE as well as smoothing.