Topic
Computational electromagnetics
About: Computational electromagnetics is a research topic. Over the lifetime, 6412 publications have been published within this topic receiving 113727 citations. The topic is also known as: Electromagnetic field analysis.
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TL;DR: In this paper, the authors proposed closed-form expressions for near-axis far-distance modal Green's functions, which can be used to accelerate the computation of BoR problems especially when the object is slim.
Abstract: To solve problems of bodies of revolution (BoR) using the method of moments, the modal Green's function is used, which is defined as the radiation field of a circular loop antenna with sinusoidal current distribution. It is a group of oscillating integrals that forms the bottleneck for further accelerating the computation of BoR problems. In this paper, we propose closed-form expressions for near-axis far-distance modal Green's functions, which can be used to accelerate the computation of BoR problems especially when the object is slim. A criterion is presented based on a rigorous error analysis to guarantee its range of applications. Both the scattering and radiation examples are presented to demonstrate the validity and efficiency of the proposed expressions.
22 citations
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TL;DR: In this paper, an integral equation-based method for simulating wave propagation in two-dimensional (2D) electromagnetic crystal (EC) devices is presented by removing cylinders from infinite, doubly periodic, and defectless electromagnetic crystals.
Abstract: A novel integral equation-based method for simulating wave propagation in two-dimensional (2-D) electromagnetic crystal (EC) devices is presented. A small number of irregular defects aside, the targeted devices are obtained by removing cylinders from infinite, doubly periodic, and defectless electromagnetic crystals. Integral equations in terms of equivalent currents that reside on the surfaces of the voids left by the removed cylinders are constructed by using Green functions innate to the defectless electromagnetic crystal. The sparse system of equations that results upon discretizing these integral equations is solved efficiently by a multifrontal method. The scheme is ideally suited to extract electromagnetic crystal device S parameters as it permits imposing modal excitations and exact absorbing boundary conditions. The scheme is applied to the analysis of two multiplexer-demultiplexer devices, a filter, and a bended EC waveguide, thereby demonstrating its versatility and computational efficiency.
22 citations
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TL;DR: In this paper, the authors reduced the scattering of electromagnetic waves by many small particles of arbitrary shapes to solving linear algebraic system of equations bypassing the usual usage of integral equations, and the matrix elements of this linear algebraal system have physical meaning.
22 citations
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TL;DR: In this article, a new high-order accurate unconditionally stable split-step finite difference time domain (SS-FDTD) method is proposed, which is derived from the exponential evolution operator.
Abstract: The split-step finite difference time domain (SS-FDTD) method characterised by unconditional stability is becoming an important numerical method in computational electromagnetics. Proposed is a new high-order accurate unconditionally stable SS-FDTD method, which is derived from the exponential evolution operator. Compared with the conventional SS-FDTD method, the numerical dispersion of the new method is greatly reduced.
22 citations
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TL;DR: In this method, a scalar weighting term /spl zeta/ is introduced in the total field/scattered field approach in computational electromagnetics, using the modified version of Maxwell's equations.
Abstract: This paper presents a method for introducing a soft source in the pseudospectral time-domain algorithm. In this method, a scalar weighting term /spl zeta/ is introduced in the total field/scattered field approach in computational electromagnetics. Using our modified version of Maxwell's equations, soft sources can be introduced simply by adding incident terms in the 8-10-cell connecting region between the total field and the scattered field. One-dimensional (1-D) and two-dimensional (2-D) examples of soft source generation and a 2-D scattering study of a dielectric cylinder are given.
22 citations