Numerical study on coupling of electrostatic discharge electromagnetic fields into a metallic cavity through an aperture BI Zeng-jun，LIU Shang-he

In this paper, coupling of electromagnetic fields generated by electrostatic discharge (ESD) spark in near area into a metallic cavity with an aperture is studied by using Finite-Difference Time-Domain (FDTD) method and a numerical coupling model is established, which is based on the revised electric dipole model of electrostatic discharge spark and the discharge current analytic expression obtained by pulse function. The analysis of the calculated results shows that there is strong electrostatic induction field at the vicinity of the aperture in the cavity and the transient field coupled in the cavity can resonate the cavity with the TE-101 mode as the leading mode, but the amplitude of the resonance is very low.