EM coupling and suppression through slots into lossless overmoded cavities using the multilevel fast multipole algorithm

With increased use of wireless communication devices and integrated wireless sensors, the problem of electromagnetic coupling and interference from radiating devices into electronic components or tissues cells becomes more crucial. Previous works in this area have concentrated on the use of the Finite Difference Time Domain or approximate models for EMC analysis. In this paper, we employ the multilevel fast multipole algorithm for EMC analysis on complicated platforms. To being with, we will investigate the effect of various aperture shapes on coupling into an overmoded lossless rectangular cavity. Further, the effect on EM coupling due to penetration of wire traces through apertures into the cavity interior will be investigated. Finally, a method of improving shielding via the use of a sequence of an array of wire strips and slot shadowing will be investigated and presented.