Deterministic and Statistical EMC Models for Field‐to‐Wire Coupling and Crosstalk in Wire Harness

This chapter focuses on the modeling of field‐to‐wire coupling and crosstalk in wiring harness. It considers the bundles of wires and bundles of twisted‐wire pairs. The chapter describes both deterministic and statistical models based on multiconductor transmission line (MTL) theory and modal analysis. Deterministic models are used to explain the involved phenomena, provide simplified circuit representations, assess MTL model validity in controlled configurations, and show the effect of terminal load and wire harness imbalance on mode conversion and resulting immunity characteristics. A statistical electromagnetic compatibility model can be defined as a transformation of random variables, that is, a modeling procedure which allows computation of the statistics of predicted output quantities, knowing the statistics of input model parameters. Coupling of random electromagnetic fields to deterministic cables can be introduced by considering at first the elemental configuration consisting of a wire running above ground and illuminated by a uniform plane wave.