| Analysis of electromagnetic scattering from dispersive medium has important theoretical significance and practical value in the modern electromagnetic engineering research. The constitutive relationship of dispersive media is more complicated than ordinary medium. The dispersive media has some unique electromagnetic properties, which attracts many experts and scholars to study in this field. In order to reduce research cost and shorten the research period, numerical simulation is the better choice when compared with the experimental measurement method. In recent years, with the rapid development of computer science and technology, how to analyze electromagnetic scattering from dispersive media and its coated target accurately and efficiently becomes the focus in the computational electromagnetics. In this paper, time-domain-integral-equation method based on marching-on-in-time scheme is used to analyze the transient electromagnetic scattering from dispersive media and its coated target. The paper can be summarized as:Firstly, a volume integral equation based on marching-on-in-time scheme is presented to analyse the transient electromagnetic scattering from dispersive bodies. The volume integral equation about dispersive media is constructed by invoking the volume equivalence principle and incorporates a recursive convolution to update equivalent electric currents from knowledge of the electric flux. Recursive relationship between electric field and electric flux density is the difficult point to realize this method. Numerical results that validate the proposed approach and demonstrate its accuracy, stability and practicability are presented.Secondly, a marching-on-in-time scheme based volume surface integral equation is introduced to analyze the transient electromagnetic scattering from the composite structures comprising perfect electrically conducting bodies and dispersive dielectric materials. It has more practical application value to analyze the electromagnetic scattering from the coated target instead of the dispersive medium. Numerical results are given to demonstrate accuracy, stability, practicability of this method and electromagnetic stealth features of this medium.Finally, the transient electromagnetic scattering characteristics from the conductor coated by thin dispersive media are analyzed. For this kind of special structure, the volume current from the media is represented by the surface current on the metal surface through the boundary conditions. It greatly reduces unknowns, and the cost of CPU time and memory of computer also reduce. Numerical results are given to demonstrate the accuracy, stability, efficiency and practicability of the proposed algorithm. |
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