Estimation of Radiated Emissions from Multi-branch Wire Harnesses Based on Discontinuities and Reciprocity

Analyzing the noise propagation of wire-harness is not simple because many electric wires run parallel and branch. To solve this, a method is proposed that formally models the branching harness as if it were a single wire bundle by virtually folding the harness at the branching points and other characteristic discontinuity points, providing better analysis prospects. Furthermore, to expand the analysis to include radiated emissions, the electromagnetic field is simulated as an incident field induction problem by inverting the transmission and reception, and the reciprocity theorem is used to determine the emission characteristics, thereby eliminating the need for repeated radiated emission simulations. The proposed method has been verified using a simple system, with the results compared to those of existing simulators.