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The characteristic mode (CM) theory has been widely recognized as a powerful tool for radiation/scattering analysis and optimization designs. As a natural extension of PEC CM theory and dielectric material CM theory, we propose a novel CM formulation for the systematic analysis of dielectric coated conducting bodies. The newly developed CM formulation bases on the EFIE-PMCHWT equation. Numerical cases...
We introduce a low-profile circular polarized, single-arm hexagonal spiral array antenna having a 30° beam scan without grating lobe operating 3:1(2 to 6 GHz) bandwidth placed on a ground plane. The array is composed of regular hexagonal spirals fed by 50 Ohm coaxial cable without Balun. A spurious resonance occurs in the feeding structure due to the periodic structure when the element antennas are...
As known electrodynamic levitation occurs without active control due to motion induced eddy currents. There are two main drawbacks related to electromagnetic bearings: 1) the presence of losses caused by the eddy currents, and 2) the onset of instability in undamped supercritical rotor systems. Accurate analysis of these devices, especially when the axial symmetry cannot be assumed, can be performed...
In this paper, the mesh free charge simulation method is used for determination of eddy currents inside a conductor translatory moving in a field of the permanent magnet. Using a reference finite element solution, we investigate the position of the inflated boundary surface where the fictitious sources are randomly located. The method can handle arbitrary shaped conductors and arbitrary oriented magnetization...
The focus of this paper is on the implementation and subsequent improvement of a technique for computing AC interference on buried metallic pipelines due to nearby power transmission lines. In order to perform this task, the finite element method (F.E.M.) is employed. After performing a description of the implementation of the classic F.E.M. approach, a hybrid technique designed to reduce the size...
EMTP (Electro-Magnetic Transient Program) is one of the best programs for surge analysis. However, the surge simulation model that corresponds to the power cable used in the transmission tower is not included in EMTP. In order to adequately treat the surge issue that arises on the electrical system, a more detailed simulation has been requested. Therefore, our research has focused on a new approach...
In this paper, the total far-field pattern around a finite width strip in presence of an electric line source using perfect electric conductor (PEC) and impedance strip equations are presented. We used two dimensional uniform geometrical theory of diffraction (UTD) in both analysis for soft (TM) polarization. For finite PEC strip, we used PEC strip equations and for finite impedance strip we used...
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