Thin-slot formalism for the FDTD analysis of thin-slot penetration considering ground reflection

In this paper, a new rectangular enclosure model for shielding effectiveness (SE) is established, which is in more accordant with practical engineering environment for it considered the ground reflection. The SE is analyzed by using different thin-slot formalism methods and the results given by C-TSF, ETSF and CP are compared with results of the finer resolution. When the width of the slot is comparable with the space increment, both ETSF and CP formalism are feasible, However, ETSF accords with finer resolution results more exactly. When the slot is far narrower than space increment, C-TSF is in good agreement with finer resolution. From the conclusion we can get a fast and accurate way of determining the SE through aperture of various sizes.