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Research on High-Order FDTD Algorithm for Three-Dimensional Targets

In order to improve the traditional time domain finite difference method, the discrete method in time is consistent with the FDTD method, while in space, the discrete format with high-order accuracy is used, thereby improving the calculation accuracy of the traditional FDTD method. In this paper, the iterative formula of high-order FDTD algorithm is derived. The near-far field extrapolation technique to the high-order FDTD algorithm is introduced. Finally, the high-order FDTD method has been applied to the analysis of electromagnetic scattering properties of three-dimensional spherical media. The numerical results show that the high-order FDTD method can still achieve better accuracy when the mesh size is larger, and not only does it take less computing time, it also saves computer memory.