Characterization of the Field-to-Wire Coupling in Coated Floating-Ground Multiconductor Cables

This article develops a semianalytical model for characterizing the terminal responses of coated floating-ground multiconductor cables (FMCs) with arbitrarily routed wiring structures illuminated by a nonuniform electromagnetic field. In contrast to previous transmission line (TL) models, where only differential-mode (DM) coupling was considered, the proposed method decomposes the field-to-wire coupling effects in coated FMCs into common-mode (CM) coupling and DM coupling. First, for CM coupling, the coated FMCs are equivalent to a CM single conductor, and the CM current distribution along this conductor is obtained by full-wave simulations. Second, the equivalent coupled sources are decomposed into CM sources converted from the CM currents and DM sources induced by the electric and magnetic fields. The CM and DM sources are obtained separately by discretizing coated FMCs and sampling the incident electromagnetic field. Third, the combination model accounting for the comprehensive DM coupling is derived utilizing TL theory based on the equivalent coupled sources. The proposed method is validated through two application examples with good accuracy and higher computational efficiency compared with full-wave simulations.