Two-Step Equivalent Sources Method for Electromagnetic Near-Field Calculations at Microwave Frequencies

IF 1.9 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Christoph J. Salomon;Nikola Petrović;Bojana Petković
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Abstract

In this article, we propose a two-step equivalent sources method (ESM) to calculate the total electric and magnetic fields in the vicinity of a dielectric scatterer located in the near-field of a radiating Hertz dipole. The electric component is determined by calculating equivalent bounded surface charges at the boundary of the dielectric object, resulting in reduced linear system of equations (LSE) compared with other ESMs that require the whole volume to be discretized. Singularities in the electric field of the surface point charges are avoided by introducing uniformly charged triangular sheets. A second set of equivalent sources is derived to account for the magnetic field. While these fictitious magnetic field sources are distributed over the whole volume of the object, no further matrix inversion is required as will be presented herein. Even with a relatively coarse discretization of 284 surface and 552 volume elements, an error of less than 0.2% with respect to a reference solution obtained from a finite element method (FEM) is achieved. The small error together with the significantly reduced computation time demonstrate the high accuracy and efficiency of the proposed method.
微波频率下电磁近场计算的两步等效源法
在本文中,我们提出了一种两步等效源方法(ESM)来计算位于辐射赫兹偶极子近场的介电散射体附近的总电场和磁场。通过计算介电物体边界处的等效有界表面电荷来确定电分量,与其他需要将整个体积离散化的esm相比,可以减少线性方程组(LSE)。通过引入均匀带电的三角片,避免了表面点电荷电场中的奇点。第二组等效源被导出来解释磁场。虽然这些虚构的磁场源分布在物体的整个体积上,但不需要进一步的矩阵反演,这将在这里提出。即使对284个表面单元和552个体积单元进行相对粗糙的离散化,相对于从有限元法(FEM)获得的参考解,误差也小于0.2%。误差小,计算时间大大缩短,表明该方法具有较高的精度和效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
IEEE Transactions on Magnetics
IEEE Transactions on Magnetics 工程技术-工程:电子与电气
CiteScore
4.00
自引率
14.30%
发文量
565
审稿时长
4.1 months
期刊介绍: Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The IEEE Transactions on Magnetics publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.
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