Extension of the magnetically mixed Newmark-Leapfrog finite-difference time-domain method to Debye dispersive media

Abstract

In this paper, the magnetically mixed Newmark-Leapfrog finite-difference time-domain (MNL-FDTD) method is extended into a Debye model of dielectric dispersion. A frequency-dependent MNL-FDTD scheme is formulated which is based on the recursive convolution formulation in time domain. The resultant scheme has a relaxed stability condition even in the time domain analysis of thin dielectric structures with the Debye model. The input impedance and radiation pattern of a typical antenna with dielectric losses are assessed by the presented scheme. It is verified in comparison with Yee's FDTD.