An FDTD Algorithm for Frequency Selective Surfaces Analysis with Excitation of High-power Electromagnetic Wave

With the wide application of high power antennas, the electromagnetic-thermal coupling analysis algorithm of radomes, a kind of devices for sheltering antennas is urgently needed. In this study, based on the finite-difference time-domain (FDTD), the field strength value is firstly obtained by FDTD, to calculate the corresponding power loss, which is then brought into the corresponding heat conduction equation as a heat source term, and then the temperature distribution of the medium is obtained based on the FDTD to get the results of the electromagnetic-thermal coupling analysis. Finally, the Frequency Selective Surface (FSS) material, made of Polytetrafluoroethylene (PTFE), is analyzed, and FDTD is used to iteratively calculate the electric field value and temperature value at time and space step, so as to obtain the results of magnetic-thermal coupling analysis under the incidence of high-power electromagnetic pulse.