Open AccessOptimised low dispersive ID‐WLP‐FDTD method based on scaling factor
Author(s) -
Ding Jinchao
Publication year - 2020
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2020.0756
Subject(s) - finite difference time domain method , laguerre polynomials , isotropy , permittivity , scaling , mathematics , dispersion (optics) , mathematical analysis , computational physics , materials science , physics , optics , geometry , dielectric , optoelectronics
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.