Numerical simulation of space-time distribution of field of horizontally polarized electromagnetic pulse simulators

The finite-difference time-domain method is used to numerically simulate electromagnetic field distribution of horizontally-polarized electromagnetic pulse simulators. Some important factors representative of simulator performance such as waveform, spatial variation and uniformity are studied. The rise time of EMP generated by the simulator is 10ns, approximately the same as the rise time of voltage source. Waveform of EMP is greatly different from that of the voltage pulse. Electric field attenuates rapidly along the horizonal axis. This kind of antenna can generate uniformly distributed EMP with high electric field strength and short rise time in a large area(≥50m,horizontal directions)．