Radiation of synchronous buck converter modelled by three magnetic moments and combined with SPICE simulations

Radiation characteristics of a system-in-package (SiP) synchronous buck converter are analyzed by a set of 3D electromagnetic (EM) simulations. The simulated radiation characteristics are modelled by three orthogonal magnetic moments. Each magnetic moment is related to a geometric loop present in the modelled structure. The proposed model describes accurately both the maximum radiated fields and the shape of the radiation pattern. The application of the proposed model is demonstrated by combining it with the results of SPICE simulations of the analyzed converter in order to predict its radiated emissions.