Stability and Accuracy of a Finite-Difference Time-Domain Scheme for Modeling Double-Negative Media With High-Order Rational Constitutive Parameters

摘要

This paper introduces an extension of the original finite-difference time-domain (FDTD) method for modeling double-negative media characterized by high-order frequency-dependent permittivity and permeability. The approach basically consists of adding electric and magnetic current densities to Maxwell''s curl equations and considering Ohm''s law as a constitutive relationship. Current densities are discretized by using a weighted average in time and Ohm''s law by applying the Mobius transformation technique.