Reducing the Numerical Dispersion in the FDTD Analysis by Modifying Anisotropically the Speed of Light

Abstract

Abstract In FDTD analysis, one of the problems is numerical dispersion caused by the discretization of time and space. In a previous publication, the present authors generalized a speed‐of‐light correction method previously applied only to isotropic meshes so that it could be applied to an anisotropic mesh. However, in the previously reported correction method the speed of light was corrected isotropically. Therefore, the error compression was small in the aniso‐tropic mesh. In this paper, a correction method is proposed in which more compression of the phase error than in the previous method is possible in an anisotropic lattice. By applying the new method to a two‐dimensional nonuniform mesh, the effectiveness of the method is demonstrated. © 2001 Scripta Technica, Electron Comm Jpn Pt 2, 85(1): 50–58, 2002