Abstract: Electrostatic-discharge (ESD) is a process of high voltage, strange E-field, transient high current pulse, which would disturb the electronic equipment by conduction and radiation. So, the effects of ESD on electronic equipment have become more and more serious and the question of ESD protection is paid more attention to. In this paper, we research how the coupled field changes with the change of contact discharge voltage on the external wall of the Metal Shield of the electronic system by using Matlab and finite-difference time-domain (FDTD) method.

Key words: FDTD, contact ESD, coupled field