共查询到17条相似文献,搜索用时 171 毫秒
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基于多层UV矩阵分解技术,提出用矩量法(MoM)求解三维各向异性阻抗面电磁散射的MoM-UV快速数值算法。根据等效原理,将表面电磁流以RWG(rao-wilton-glisson)矢量基函数展开。引入阻抗边界条件(IBC),以表面阻抗并矢表征电磁参数,实现各向异性阻抗面的电磁仿真。通过多层UV进行低秩矩阵压缩,减少矩阵-向量积运算和内存需求,利用稳定的双共轭梯度(BICGSTAB)迭代方法求解。给出典型算例,并与Mie级数解等精确结果比较,验证该算法的精度和效率。 相似文献
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本文分析了二维阻抗圆柱的电磁散射机理,讨论了金属圆柱、有耗涂层圆柱与阻抗圆柱的等效特性,获得了它们的散射场一致性绕射理论(UTD)解。最后,给出了一组计算实例。 相似文献
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本文把应用于理想导体劈中的等效边缘电磁流概念推广应用到阻抗劈上,导出了劈边缘在产面波斜入射情况下与阻抗劈绕射密切相关的等效边缘电磁流表达式,然后利用辐射积分公式,给出了有限长直劈的电磁散射解。为计算平板模型机翼的RCS打下了理论基础,文中给出的计算实例说明了本文方法的有效性。 相似文献
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Jiade Yuan Zhenyi Niu Zhuo Li Changqing Gu 《Journal of Infrared, Millimeter and Terahertz Waves》2010,31(6):744-752
The equivalent dipole-moment method (EDM) is extended and applied in the analysis of electromagnetic (EM) scattering by arbitrarily
shaped perfect electric conductor (PEC) targets coated with electric anisotropic media in this paper. The scattering targets
are discretized into tetrahedral volume elements in the material region and into triangle patches on the conducting surface,
where the volume-surface integral equation (VSIE) is set up. Then the method of moments (MoM) is employed to solve the VSIE.
In the impedance matrix, the near field interaction elements are computed by the conventional MoM while the far field interaction
elements are modeled by the EDM. The proposed approach is sufficiently versatile in handling arbitrarily shaped objects coated
with general electric anisotropic media and is easily constructed through a simple procedure. Numerical results are given
to demonstrate the accuracy and efficiency of this method. 相似文献
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A rigorous spectral solution for three-dimensional (3D) electromagnetic scattering by the edge of an anisotropic impedance half-plane with a perfect electric conducting (PEC) face is presented. The surface impedance tensor of the loaded face is characterised by: (i) principal anisotropy axes arbitrarily oriented with respect to the diffracting edge; (ii) a vanishing surface impedance along a principal anisotropy axis and an arbitrary impedance in the orthogonal direction 相似文献
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Jo-Yu Wu Kingsland D.M. Jin-Fa Lee Lee R. 《Antennas and Propagation, IEEE Transactions on》1997,45(1):40-50
The use of an anisotropic material for the boundary truncation of the finite-element method is considered. The anisotropic material properties can be chosen such that a plane-wave incident from free space into the anisotropic halfspace has no reflection. Because there is no reflection, the material is referred to as a perfectly matched layer (PML). The relationship between the anisotropic PML and the original PML proposed by Berenger (see J. Comp. Phys., vol.114, p.185-200, October 1994) is considered. The anisotropic PML is applied to the finite-element solution of electromagnetic (EM) scattering from three-dimensional (3-D) objects. Numerical results are presented to demonstrate the accuracy of the PML 相似文献
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The Huygens' principle is presented for an electromagnetic field in a rotationally invariant anisotropic region. The representation is investigated by deriving surface integral equations for scattering, resulting, for instance, in scattering formulations for an impedance body and for a perfectly conducting electric sheet (both embedded in the anisotropic material). Validation is accomplished via application to a canonical geometry 相似文献
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The three-dimensional electromagnetic (EM) scattering from half and full plane configurations, both characterized by a perfectly conducting and an anisotropic impedance face, is analyzed. The anisotropic impedance boundary condition considered for the loaded face is suitable for modeling corrugated surfaces or strip-loaded grounded dielectric slabs used to realize artificially hard or soft surfaces, with a tensor surface impedance exhibiting a vanishing impedance along the corrugations or strips and a diverging impedance in the orthogonal direction. Previous rigorous solutions, valid when the vanishing impedance direction is either parallel or perpendicular to the edge, are generalized here to the case in which the direction of vanishing impedance is arbitrarily oriented 相似文献
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L. Mo K. F. Tsang Edward K. N. Yung R. S. Chen D. G. Fang 《Journal of Infrared, Millimeter and Terahertz Waves》2002,23(10):1529-1543
In this paper, both banded and symmetric successive overrelaxation (SSOR) preconditioned conjugate gradient (PCG) techniques are combined with method of lines (MOL) to further enhance the computational efficiency of this semi-analytic method. The electromagnetic wave scattering of 2-D frequency-selective surface is used as the examples to describe its implementation, whose analysis usually needs fast algorithms because of electrically large dimension. For arbitrary incident wave, helmholtz equation and boundary condition are used to calculate the impedance matrix and then to obtain reduced current-voltage linear matrix equation in spatial domain. Both banded and effective symmetric successive overrelaxation preconditioned conjugate gradient iterative method are chosen to solve this matrix equation. Our numerical results show that PCG methods can converge to accurate solution in much fewer iteration steps for analysis of the electromagnetic wave scattering from 2-D frequency-selective surface. 相似文献
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Electromagnetic Scattering From Objects Above a Rough Surface Using the Method of Moments With Half-Space Green's Function 总被引:1,自引:0,他引:1
Bo Guan Jian Feng Zhang Xiao Yang Zhou Tie Jun Cui 《Geoscience and Remote Sensing, IEEE Transactions on》2009,47(10):3399-3405
An efficient approach is proposed to analyze the electromagnetic scattering from objects above a 2-D perfectly electric conducting rough surface. A half-space Green's function with the rough-surface interface is first derived from the Kirchhoff approximation (KA). The method of moments is then applied to analyze the scattering problem of 3-D arbitrarily shaped objects above the rough surface. Since only the objects need to be discretized, the computational time and memory requirement are greatly reduced. The radar cross sections of typical objects above the rough surface have been computed using the proposed method. Numerical results show that the proposed method has good accuracy in the valid range of KA. 相似文献