Investigation on Time- and Frequency-Domain Responses of Some Complex Composite Structures in the Presence of High-Power Electromagnetic Pulses

Investigation on time- and frequency-domain responses of some complex composite structures in the presence of high-power electromagnetic pulses (EMP) is carried out in this paper. An efficient hybrid numerical method is proposed and implemented for studying an EMP penetrating through arbitrary apertures on a perfectly conducting (PEC) screen, coupled with conical spiral wire and even with Yagi-Uda antennas. This method effectively combines the time-domain integral equation (TDIE) with time-domain physical optics (TDPO), where hybrid TDIE-TDPO equations are solved by marching-on-in-time scheme (MOT). In its implementation, the antennas, wire-surface junctions, and the small part of the solid platform in the vicinity of the junctions are assigned to the TDIE region; nevertheless, a small part of the PEC screen in the vicinity of the apertures is set to be the TDIE region, while the remainder of the solid platform and the PEC screen is in the TDPO one. Our developed numerical algorithm is sufficiently verified in both time and frequency domains for predicting input admittance, S₁₁ and S₂₁ parameters, directivities, excited transient current responses as well as backward scattered fields of different antennas mounted on a PEC platform. These results are useful for further evaluating electromagnetic environments of some complex communication.