Numerical analysis on hole coupling effects of an oblique incidence of electromagnetic pulse

The finite-difference time-domain method is used to research the rule of the electromagnetic pulse coupled to the cavity with different kinds of holes on it. The coupling effects of EMP on square, rectangle hole，multi-hole and the rule of EＭＰ having different polarized direction coupled to rectangle hole are described. Computational data indicate: (1) The energy coupled to the square hole of EＭＰ is less; (2) When the polarized direction of the incident wave are parallel to the short side of the hole, the energy coupled will attain the maximum; (3) The hole area being the same, the energy coupled to the multihole are less than that to the single hole.