Approximate Numerical Reflection Coefficient of Isotropic-Dispersion Finite-Difference Time-Domain(ID-FDTD) Scheme at the Planar Dielectric Interface for the TM Wave

摘要

This paper presents an analytical formulation of the numerical reflection coefficient of the ID-FDTD scheme at the planar dielectric boundary for a TM wave incidence. The reflection coefficient is formulated in an approximate manner, and the accuracy of this method is numerically verified. The effective dielectric constant for a grid on the interface is obtained, and then reduced to that of the Yee scheme for a small cell size.