Approximate Transmission-Line Model for Field-to-Wire Coupling in Arbitrarily Routed Wiring Structures Above Ground

In this article, a comprehensive method for parametric representation of wire trajectories, allowing accurate geometric description complex and arbitrarily oriented bundles, is introduced. This the starting point to develop computationally efficient numerical transmission-line (TL) model predicting radiated susceptibility bundles wires, illuminated by (possibly) nonuniform electromagnetic fields. The proposed foresees solution field-to-wire coupling problem through suitable discretization sampling bundle geometry incident field. Differently from previous models, where parallel ground were assumed, allows arbitrary orientation exploiting, first, exact projection external field onto direction, second, evaluation actual length (instead longitudinal one) each TL section. Accuracy computational efficiency are assessed versus full-wave simulation two application examples, involving parabola-shaped trefoil knot-shaped wiring structures above ground. Although strong nonuniformity affecting these forces theory work very close its limits, achieved agreement satisfactory significant reduction times makes approximate yet prediction characteristics bundles.