Study On Time Domain Fast Algorithm For Mixed Target Of Metal Medium

With the rapid development of science and technology, the system of modern engineering applications becomes particularly complex. The issue of how to analyze such problems in a quick, high efficiency and accurate way is taking on more urgency. This type of system is mainly composed of the metal and dielectric materials. Time domain integral equation methods in the analysis of electromagnetic scattering have a great advantage, but it is hard to analysis when electrical size getting larger, so this paper mainly research on the quick methods of computing electromagnetic scattering characteristics from mixed metal and dielectric objects.The first part of this paper introduces the background and significance.The second part of this paper introduces the basic theory of time-domain integral equation algorithm, which based on the time, through the differential form of Maxwell’s equations, combined with the boundary conditions, establishing surface integral equations and volume integral equations respectively. Using the corresponding time and space basis function to expand the unknowns and then discuss and solve the marching-on-in-time algorithm.Finally, the time-domain source excitation and the calculation of the scattered field were introduced.The second part of the paper describes the time-domain plane wave accelerate the volume and surface integral equation. When the volume and surface integral equation were used to analysis the mixed metal and dielectric objects, its memory consumption is amazing, so it is difficult for the analysis of large target. Then we introduce the plane wave time domain to accelerate it, which can reduce its memory consumption and compute time, enable it can be used to analysis large target efficiently and accurately. Finally, it is parallelized to further improve its ability to analyze electrically large targets.The third part of this paper mainly analyzes the electromagnetic scattering characteristics from the conductor coated by thin dielectric. First, we establish the scattered field equations by Maxwell equations, and then through the boundary conditions, the volume current from the media is represented by the surface current on the metal surface. It will greatly reduce unknowns,compared to the volume and surface integral equation methods, thus reducing the time and memory of computer when in the calculations. Meanwhile, with the change of layers and the dielectric coating media parameters, unknown amount will not change, compared to other methods, the advantages are obvious.