Shielding Effectiveness of Perforated Screens Through an Inverse Problem-Based Resolution

This paper shows that the radiated fields from perforated plane shields excited by a circular loop are the same than those produced by one or several magnetic dipoles located on the plane of the apertures. The way to derive this equivalent model is based on an inverse problem using optimization methods and near-field calculation (method of moments) or measurements. The proposed approach allows to evaluate the shielding effectiveness of the perforated screens. All results are compared with the experimental values to check the validation. Such equivalent models could be used to avoid meshing screens, in case a 3-D problem involving an enclosure with arrays of apertures or to simplify the electromagnetic compatibility analysis of power electronic devices having shielded enclosures.