Efficient Modeling of EM Scattering from Dielectric-Metal Composite Targets
To address challenges in computing the electromagnetic(EM)scattering of complex targets with anisotropic dielectric coatings and metallic components,the authors propose an efficient hybrid algorithm.This algorithm is designed for simulating the EM scattering of complex targets coated with anisotropic dielectric materials.Built upon impedance boundary conditions,the method utilizes surface impedance vectors to characterize the EM properties of the dielectric.It effectively leverages the advantages of the low-frequency Method of Moments(MoM)and the high-frequency Physical Optics(PO)to achieve high-precision and rapid EM simulations of dielectric-metal composite targets.By employing impedance boundary conditions(IBC)and the equivalence principle,the EM scattering problem of targets covered with thin dielectric layers is transformed into a radiation problem involving equivalent EM currents on impedance surfaces,facilitating highly accurate and fast computation of the radar cross section(RCS)for complex targets coated with anisotropic dielectric materials.To validate the algorithm's performance,simulations are conducted on targets including square plate,simplified aircraft,and intricate satellite model.Comparative analysis reveals that the simulated results from the proposed algorithm exhibit root mean square error(RMSE)of merely 0.82 dB,1.56 dB,and 2.64 dB when juxtaposed with numerical solution,all of which are notably superior to the 3 dB engineering standard error.Moreover,the algorithm demonstrates a significant enhancement,surpassing 50%,in computational efficiency in terms of memory consumption and computational duration,substantiating both its accuracy and practical utility.
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