MAGNETIC-FIELD ATTENUATION OF NONLINEAR SHIELDS

The analysis of shielding performance of planar shields against near f ield sources is carried out in the time domain to account for the nonl inear behavior of ferromagnetic materials used in low frequency applic ations, To this end, the Schelkunoff approach for shielding problems h as been reformulated in the time domain introducing the transient wave impedances which relates transient electric and magnetic field compon ents and appear in the integrodifferential boundary conditions. The fi nal equation system is solved by means of a numerical procedure based on the Finite Element Method. The obtained results are compared with a nalytical and measured data in different configurations.