Quantitative Representation of Frequency Dispersion of Primary Parameters of Shielded-FPC

The purpose of this paper is to quantitatively express the frequency dispersion of primary parameters of flexible printed circuits with a thin conductive shield. Unlike basic transmission lines, the physical phenomenon of theses frequency dispersion characteristics has not been completely clarified and cannot be predicted quantitatively. The quantitative representation would be an important design guide for implementing conductive shields on the transmission lines. This paper provides a quantitative representation method of the frequency dispersion by fitting mathematical expression. It is demonstrated that the frequency dispersion of resistance and inductance caused by implementing the thin conductive shield can be expressed quantitatively as sigmoid functions.