Evaluating Field Interactions Between Multiple Wires and the Nearby Surface Enabled by a Generalized MTL Approach

Interactions between a cable harness containing multiple wires and the nearby metal surface can be evaluated by full-wave methods. Though these methods can calculate the interactions with great accuracy, they have long simulation times and large memory requirements when dealing with complex wire structures. The multiple scattering (MS) approach by treating the cable harness and the surface separately using different algorithms has been proven to be superior to the full-wave methods when evaluating these interactions. However, the cable harness solver in the previous MS approach is restricted to two-wire structures since the per-unit-length (pul) inductance (L) and capacitance (C) are derived based on the antenna and differential modes assumption between two wires. In this paper, a generalized multiconductor transmission-line (GMTL) approach is proposed to overcome the two-wire limitation. In the GMTL approach, all wires take the infinity as the reference. The extraction of the pul L and C for the cable harness is not limited by the number of wires. Thus, the GMTL approach can conveniently model multiple wire structures. The application of the GMTL approach to the multiple wires enables the MS approach to accurately evaluate the interactions between the cable harness and the metal surface.