Source Reconstruction of Electronic Circuits in Shielding Enclosures Based on Numerical Green’s Function and Application in Electromagnetic Interference Estimation

In this work, to characterize the radiated emission from electronic circuits in shielding enclosure, an improved electric dipole-based source reconstruction method (SRM) is developed. Moreover, by resorting reconstructed equivalent source, estimation of electromagnetic interference (EMI) between different circuit modules enclosure can be conveniently and accurately evaluated. Different free-space SRM, dipoles proposed SRM are directly placed over box enclosed board, numerical Green’s function (NGF) developed bridge connection planar scanned magnetic near-field. With NGF strategy, effects surrounding environments (including presence substrate, ground plane, enclosure) inclusively considered, which makes valid for any complex EM theory. Since also has capability reproducing inside it critically helpful evaluate EMI enclosure. To reach aim, Rayleigh-Carson Reciprocity theorem referred, original coupling problem decomposed into “forward problem” “reverse problem.” A Huygens enclosing victim module built fields on obtained using both problems. Then calculated accordingly. Therefore, novelty merits approach threefold: 1) physically-based dipole model considers interactions radiation sources objects, leading accurate prediction emissions outside enclosure; 2) due utilization NGF, there no approximation involved solution dipole’s radiation, thus improving calculation precision; 3) near-field multiple identified precisely, useful diagnostics sources. The effectiveness algorithm verified representative examples.