Efficient Characterization of Field-to-Wire Coupling in Twisted-Wire Pair with a Reference Wire

Efficient characterization of field-to-wire coupling in twisted-wire pair (TWP) near a reference wire is performed in this paper. The averaged-per-unit-length parameters of this transmission line system are first derived for two typical cases, i.e. the reference conductor is inside or outside the TWP, respectively. The induced voltage sources for describing the field-to-wire coupling are determined analytically in closed form. The proposed model is able to fast predict both common mode and differential mode currents induced at the terminals of such system, and it is validated in comparison with the full-wave solution obtained by commercial software FEKO, with the simulation time reduced greatly.