Near-Field Coupling Characteristics Analysis of Radome Over Half-Space Under HPEM

Analysis of the interaction between high-power electromagnetic (HPEM) pulse and targets is often carried out in free space. However, the half-space effect cannot be ignored when targets are located near the ground. Electromagnetic field and energy-flux density coupling into a radome over lossy half-space are investigated based on a semianalytic method. In this paper, the interaction of the EM wave and the radome is computed by finite-difference time-domain (FDTD) method. The bidirectional incident wave of the FDTD region is introduced by the Fresnel formula, Fourier transform, and the equivalence principle. Finally, different incident conditions such as incident planes and polarization modes are discussed. The numerical results show that this method can provide a reliable technique for estimating the electromagnetic coupling effects on targets over half-space under HPEM pulses.