Propagation of Electromagnetic Pulse Onto a Moving Lossless Dielectric Half-Space: One-Dimensional Simulation Using Characteristic-Based Method

Ho, Mingtsu

doi:10.1163/1569393053303910

Cited by 13 publications

(12 citation statements)

References 4 publications

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“…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].…”

Section: Introductionsupporting

confidence: 59%

“…n × E = 0 (13) wheren is the exterior normal vector of the grid on the cylinder surface. It is noted that (12) ensures no EM fields with the magnetic field being perpendicular to the surface that can be radiated from the cylinder and that the electric field intensity must be vanished on the PEC cylinder surface according to (13).…”

Section: Governing Equations Surface Current and Boundary Conditionsmentioning

confidence: 99%

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

Ho¹,

Lai²,

Chen³

et al. 2011

PIER M

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Abstract-The radiated electromagnetic (EM) fields from a rotating current-carrying circular cylinder were numerically simulated in two dimensions using the method of characteristics (MOC), and the numerical results were presented in this paper. To overcome the difficulty of the grid cell distortion caused by the rotating cylinder, the passing center swing back grids (PCSBG) technique is employed in collaboration of MOC in a modified O-type grid system. In order to have clear demonstration of radiated EM fields, the circular cylinder is set to be evenly divided in radial direction into an even number of slices that are made of perfect electric conductor (PEC) and nonelectric nonmagnetic material, alternatively. The surface current is assumed to have a Gaussian profile and to flow uniformly along the axial direction on the PEC surface. The radiated electric and magnetic fields around the cylinder were recorded as functions of time and reported along with the corresponding spectra which were obtained through proper Fourier transformation. Several field distributions over the whole computational space are also given.

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Section: Introductionsupporting

confidence: 59%

Section: Governing Equations Surface Current and Boundary Conditionsmentioning

confidence: 99%

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

Ho¹,

Lai²,

Chen³

et al. 2011

PIER M

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“…Its implicit formulation was developed for the same purpose and its results were found to agree with data produced by FDTD [16]. It is also shown that the characteristic-based method can predict the reflection of electromagnetic fields from moving/vibrating perfect conductor in one dimension [17,18], the effects of finite conductivity on the reflection/transmission of electromagnetic fields [19], and the reflection/transmission of electromagnetic field propagation onto moving dielectric half space [20]. Unlike MoM and FDTD where all field components are placed at the grid nodes, the characteristic-based method defines all field quantities in the center of the grid cell.…”

Section: Introductionmentioning

confidence: 90%

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

Ho¹,

Lai²,

Tan³

et al. 2008

PIER

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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.

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“…There have been many studies investigating this issue. Some studies focus on the derivation of the theoretical solutions for the EM scattering by perfect conductors in uniform translational motion [1][2][3][4][5][6][7][8][9][10][11], some on the EM scattering by linearly vibrating objects [12][13][14], some on the simulation of the scattered EM fields from perfect planes moving and vibrating [15][16][17], and one on a moving dielectric half-space [18]. Among them, Harfoush et al provided computational results, in addition to the theoretical analysis, by using the finite-difference time-domain (FDTD) technique, in which both Faraday's and Ampere's laws were employed as aides to respectively approximate the magnetic and electric fields immediately next to the moving surface whenever the surface travels away from the grid point [3].…”

Section: Introductionmentioning

confidence: 99%

“…The numerical simulations of the reflected EM fields from uniformly travelling and oscillating perfect plane were carried out using MOC in collaboration with the relativistic EM field boundary conditions, and the computational results revealed that the reflected fields disclose not only the modulations in phase and amplitude but also the Doppler shift in spectrum. It is also explained that, due to the movement of the boundary, some moments grid cells were gradually eliminated from the grid system, and for other certain moments, grid cells were introduced little by little into the grid system [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Scattered Em Fields From Rotating Cylinder Using Passing Center Swing Back Grids Technique in Two Dimensions

Ho¹

2009

PIER

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Abstract-In this paper, a new numerical technique, passing center swing back grids (PCSBG's) for the resolution of the grid distortion difficulty due to the rotational motion of objects is introduced. This proposed swing-back-grids approach alongside of the method of characteristics (MOC) is developed to solve EM scattering problems featured with rotating objects. The feasibility of such combination is apparent from the fact that MOC defines all field quantities in the centroid of the grid cell. The scattered EM fields from a rotating circular cylinder under the excitation of an EM pulse are predicted in two dimensions and the electric field distributions recorded at several time instances are demonstrated. In order to confirm that the cylinder is rotating and scattering EM fields simultaneously, the circular cylinder is uniformly divided into an even number of slices with one perfect reflector and one non-reflector alternatively since a rotating circular cylinder causes no relativistic effects.

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Propagation of Electromagnetic Pulse Onto a Moving Lossless Dielectric Half-Space: One-Dimensional Simulation Using Characteristic-Based Method

Cited by 13 publications

References 4 publications

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

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

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

Simulation of Scattered Em Fields From Rotating Cylinder Using Passing Center Swing Back Grids Technique in Two Dimensions

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