Numerical Simulation of Propagation of Em Pulse Through Lossless Non-Uniform Dielectric Slab Using Characteristic-Based Method

Abstract

Abstract-This paper demonstrates the one-dimensional computational results of the propagation of Gaussian electromagnetic pulse through dielectric slabs of finite thickness with variation in permittivity. The numerical approach used is the characteristic-based method solving the time-domain Maxwell curl equations involved with nonuniform permittivity. In the numerical model, all dielectric slabs are assumed to be isotropic, lossless, and linear. The permittivity of dielectric slab may increase or decrease linearly or sinusoidally. The numerical permittivity is finely discretized such that the variation between two adjacent grids is so small that the non-uniform permittivity is assumed to be piecewise continuous and consequently can be modeled as an individual block. The numerical results of various electric fields, both in the time-and frequency-domain, are presented and compared based on the dielectric slab of constant permittivity for close investigating the effects of the non-uniform permittivity distribution on the electromagnetic fields. It is also shown that under certain arrangement of Gaussian electromagnetic pulse and dielectric slab thickness the pattern of field propagation, reflection and transmission, can be reproduced in different time scales and frequency ranges.

Radiated Em Fields From a Rotating Current-Carrying Circular Cylinder: 2-Dimensional Numerical Simulation

“…It is shown that MOC yields results which are compatible with data generated by the FDTD technique [11] and in good agreement with the theoretical values when EM fields reflected from a traveling and/or vibrating perfect surface [12]. Also, MOC produces reasonable trends in the following cases: the effects of medium conductivity on the propagation of EM pulse onto conducting dielectric half space [13] and the propagation of EM pulse through lossless non-uniform dielectric slab [14].…”

A Novel and Accurate Method for Designing Dielectric Resonator Filter

“…is both complex and time-consuming. From one hand, the non-homogenous structure and from the other hand, the high frequency of applications, demand high density meshing in order to achieve accurate response [1][2][3].…”

“…is both complex and time-consuming. From one hand, the non-homogenous structure and from the other hand, the high frequency of applications, demand high density meshing in order to achieve accurate response [1][2][3].The explained method in this paper enables us to design a Chebyshev band passes filter by coaxially placing high-Q TM 01δ dielectric resonators in a cutoff circular waveguide. In the presented work, discussions are made regarding high-Q resonators and interresonator coupling.…”

Em Fields Inside a Rotating Circular Hollow Dielectric Cylinder: Numerical Simulation in 2ds

“…In [13], the perfect surface travels at extremely high velocity, 90% of the speed of light. Computational results generated by MOC were found to give reasonable trends in the following cases: the effects of medium conductivity on the EM fields propagating onto conducting dielectric half space [14] and the transmission of EM pulse through lossless non-uniform dielectric slab [15]. To overcome the grid distortion caused by the rotating cylinder, PCSBG was proposed based on the nature of MOC that all field components are defined at the cell center [16].…”