Electromagnetic Coupling Estimation Based on Hybrid Equivalent Dipoles and Field-Circuit Models

In most practical electromagnetic interference (EMI) problems, the intricate nature of both EMI source and victim structure often renders direct modeling unfeasible. To address this challenge, this article introduces an innovative EMI estimation method based on hybrid equivalent models. This approach involves the extraction of equivalent dipoles model for EMI source and equivalent circuit model for victim device. To establish the equivalent dipole model for the EMI source, near-field scanning is employed to obtain the phaseless near-field. Subsequently, the dynamic differential evolution method is utilized to derive the equivalent dipole model based on the acquired near-field amplitudes. For the victim's device, a specialized fixture is designed and the de-embedding method is applied to obtain the equivalent <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">S</i>-parameter model. Incorporating the two equivalent models into a hybrid field-circuit simulation enables an effective estimation of EMI coupling between the EMI source and victim. The efficacy of the proposed method is substantiated through rigorous validation exercises involving numerical simulations and physical measurements, including various EMI sources and victim devices.