Shielding effectiveness characterization of metallic enclosures with a thin-sheet panel illuminated by a arbitrary polarizations high-power EMP

This paper presents an improved sub-cell model for modeling thin material in metallic enclosures using the finite-difference time-domain (FDTD) method. The enhanced thin material sub-cell algorithm proposed can model thin magnetic material sheets including their losses. Our FDTD results are compared with the shielding effectiveness obtained by transmission line method, with good agreements achieved. Therefore, the enhanced sub-cell algorithm is further used to predict shielding effectiveness of some metallic enclosures with thin material sheet on the apertures in the presence of an arbitrary polarization high-power ultra-wideband electromagnetic pulse.