Abstract
An optimised low numerical dispersion unconditionally stable finite-difference time-domain (FDTD) method based on the isotropic dispersion (ID) scheme and weighted Laguerre polynomials (WLP) is presented. The proposed method adopts a scaling factor for permittivity and permeability in the ID-WLP-FDTD method, which can generate almost the exact phase velocity for a single frequency. In contrast with the traditional WLP-FDTD method and ID-WLP-FDTD method, the numerical dispersion of the new method is significantly reduced, and the proposed method can guarantee high accuracy and high efficiency simultaneously.
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