共查询到20条相似文献,搜索用时 17 毫秒
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精确阻抗边界条件的推导 总被引:3,自引:0,他引:3
针对Leontovich阻抗边界条件IBC是近似阻抗边界条件这一不足之处,本文利用电磁场理论中的一般边界条件和麦克斯韦方程,考虑到平面波的传播特点,导出了不含近似的精确阻抗边界条件(EIBC),给出了精确阻抗这界条件一般矢量表达式及其在直角坐标系和柱坐标系中的表达形式。导出的结果显示,Lontovich阻抗边界条件只是精确阻抗边界条件一个特例。 相似文献
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时域有限差分法模拟中所用的驻波-行波边界条件(STWBC)具有较高的计算效率,且非常易于实现.但此吸收边界条件最初仅用于直角坐标的情形.文章将STWBC扩展到柱坐标的情形与直角坐标的情形一样,柱坐标中的STWBC也在计算域外附加理想导电(磁)壁进行截断,并将边界处的驻波转化为行波,从而模拟行波在无限大空间的传播.文中给出的数值算例证明了此种吸收边界条件的有效性. 相似文献
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柱坐标系下FDTD算法的吸收边界条件 总被引:5,自引:2,他引:5
本文借助二阶准波方程式研究了柱坐标系下FDTD算法的一种吸收边界条件.根据这一边界条件,编制了相应的计算程序检验其吸收特性,并与均匀柱面波传播的简单吸收条件作了比较.计算结果表明,该吸收边界条件具有较好的吸收性能. 相似文献
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A modified (2M, 4) scheme of the high-order two-dimensional finite-difference time-domain (FDTD) method based on wave equation is proposed. It has the fourth-order accuracy in the time domain using the symplectic integrator propagator, and the 2M-order accuracy in the space domain using the discrete singular convolution method. The distinctive features between the modified scheme and the traditional (2M, 4) FDTD based on Yee algorithm are listed as follows. First, the modified scheme is based on the wave equation. Second, the computational region is discretized by uniform mesh rather than the Yee mesh. Third, the modified scheme costs less memory than the Yee algorithm because fewer field elements are involved in computation. Numerical examples are provided to validate its accuracy and effectiveness 相似文献
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本文首先给出一般阻抗面上的精确阻抗边界条件,然后把它应用到阻抗劈劈面上,结合麦克斯韦方程,考虑平面波相对阻抗劈边缘垂直入射和斜入射两种情况,导出了柱坐标系中阻抗劈表面以一阶偏微分方程形式表达的精确阻抗边界条件。 相似文献
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A generalized impedance boundary condition is developed to rigorously model on-chip interconnects in the full-wave surface integral equation by a two-region formulation. It is a combination of the electric-field integral equation for the exterior region and the magnetic-field integral equation for the interior conductive region. The skin effect is, therefore, well captured. A novel integration technique is proposed to evaluate the Green's function integrals in the conductive medium. Towards tackling large-scale problems, the mixed-form fast multipole algorithm and the multifrontal method are incorporated. A new scheme of the loop-tree decomposition is also used to alleviate the low-frequency breakdown for the formulation. Numerical examples show the accuracy and reduced computation cost. 相似文献
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Impedance boundary is generally considered as an approximate model for material interfaces. Considering an electromagnetic field in a certain wave-guiding anisotropic material it is shown that a slab of such a material backed by a perfect electric conductor (PEC) plane can be exactly represented by impedance-boundary conditions. As a result of the analysis, a novel explicit relation is derived between the surface admittance dyadic of the impedance boundary and the material and geometric parameters of the anisotropic slab which can be used to realize a given admittance dyadic. The relation is verified with results known for the perfect electromagnetic (PEMC) boundary and bi-axial material, considered as special cases of the theory 相似文献
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FTFN based single input and three outputs transadmittance filter topology supporting simultaneously three filtering signals LP, BP, and HP without any passive component matching conditions is presented. The filter uses three PFTFNs and five passive components and realizes all current signals at high impedances, lending feature of cascadibility to the circuit. The circuit enjoys low sensitivity figures. PSPICE simulation results confirming the theoretical calculations are included. 相似文献