Accurate analysis of electromagnetic shielding problems using MoM SIE method

Calculation of shielding efficiency of a conducting spherical shell using MoM SIE based code is presented in this paper. Theorem of surface equivalence is used in order to minimize propagation of numerical error through the walls of the shell. Accuracy is further improved by using advanced matrix equilibration and special integration methods for highly accurate evaluation of MoM matrix elements. Simulation results are compared with analytical solution. Very good agreement is obtained, even in cases when field inside the cavity is more than 260 dB below the level of incident field.