Shielding effectiveness evaluation of a loaded perforated enclosure by hybrid FDFD-MoM

In this Paper, shielding effectiveness of an enclosure is analyzed by an efficient hybrid finite difference frequency domain (FDFD) and method of Moments (MoM) technique. The enclosure is loaded with a realistic microstrip transmission line (MTL). The susceptibility of the load is also studied to show the effect of external interference plane wave. In our proposed FDFD solution, lumped elements are modelled by modifying the representing node coefficient according to the type and direction of the element. Also, non uniform discretization is applied for the FDFD solution region to increase the analysis efficiency. In addition, here, the frequency-independent elements of the impedance matrix are identified and are computed once and then are used for the whole frequency range. Results are validated by commercial software simulations.