Prediction of 3D-near field coupling between a toroïdal inductor and a transmission line

This paper presents an application of a 3D near-field modeling approach to predict the coupling between a toroïdal inductor (TI) and a transmission line (TL) placed in its vicinity. The TI equivalent 3D emission model is combined with analytic coupling formulations to compute the induced voltages in different configurations of the victim line. The proposed modeling procedure is less consuming in terms of computing times, preserves DUT confidentiality and offers an accurate electromagnetic interference (EMI) prediction. Results enable designers to optimize components positions inside electronic boards to guarantee electromagnetic compatibility (EMC) of the whole system.