Application Of Coupling Time Domain Finite Difference Method In Electromagnetic Analysis

Finite-difference time-domain method (FDTD) has been widely used to simulate the electromagnetic scattering and radiation problems due to its simple mathematical process and the high efficiency in the past thirty years. The conventional CFDTD will introduce staircasing error in analysing curved objects. By fitting the irregular object surface with high precision conformal CFDTD method can improve the accuracy greatly. Simulating the large and complex structures, the memory and computation time can’t be competent for the single machine.However explicit FDTD has natural parallelism and can be combined with large scale parallel technology to solve the problem of electrically large size effectively. FDTD algorithm has certain practical significance to solve practical problems.It has been an effective way to study new materials by using FDTD to analyze complex medium. As a special material, plasma is of great significance to the research of plasma. In this paper, the scattering of the non magnetized plasma and magnetized plasma is analyzed by the conformal FDTD. Non uniform plasma on the surface of the near space vehicle affects the scattering characteristics of the aircraft. By using the finite difference time domain finite difference method to simulate the scattering of inhomogeneous plasma, the non uniform plasma simulation of electrically large size is realized in the light of the actual physical model.With the rapid development of the computing power of graphics processor (GPU), the GPU accelerated computing is extended to the numerical analysis field. Using GPU to accelerate the FDTD algorithm is a hot topic. In this paper, the GPU acceleration technique is applied to the conformal FDTD algorithm, and the advantage of GPU acceleration is verified by the radiation and scattering problems. The GPU accelerated CFDTD is extended to practical applications, and the effect of EBG structure on the low pass filter is analyzed. Left handed materials anti espionage has been widespread concerned by scientists. In this paper, using the CFDTD algorithm to study the transmission properties of left-handed material array, analysis of the left-handed material electromagnetic inverse scattering in detail.