共查询到17条相似文献,搜索用时 196 毫秒
1.
2.
内谐振条件下导体散射特性的双正交模法分析 总被引:3,自引:0,他引:3
众所周知,当我们应用积分方程,不论是电场积分方程还是磁场积分方程,去分析导体的散射特性时,在内谐振条件下将出现解答的不唯一性或不稳性问题,给计算工作带来严重的困难。本文提出的双正交模分析方法有效地克服了这一困难,且该方法具有使用简单和概念清晰的优点。若干数值计算实例表明了该方法的正确性和有效性 相似文献
3.
一种求解目标内谐振时散射截面的有效方法 总被引:2,自引:1,他引:1
众所周知,在内谐振频率点上,用矩量法求解电场或磁场表面积分方程将得到不正确的表面电流。文中应用奇异值分解和正交化方法对由电场积分方程计算出的表面电流进行修正,从而得到目标表面上产生散射场的真实电流分布。文中计算了一无限长理想导体圆柱内谐振时的散射截面,所得结果与解析解一致,并对一无限长理想导体正方柱的后向散射截面进行了计算,结果表明本文方法是有效和准确的。 相似文献
4.
5.
应用渐近波形估计技术快速计算宽带雷达散射截面 总被引:3,自引:0,他引:3
将渐近波形估计技术应用到矩量法中 ,计算了任意形状二维理想导体目标的宽带雷达散射截面 .计算中使用矩量法和奇异值分解技术求解电场积分方程 ,得到一展开频率点的表面电流密度 ,通过Pad啨近似求出给定频带内任意频率点的表面电流密度分布 ,进而计算出散射场和雷达散射截面 .奇异值分解技术的使用消除了电场积分方程的内谐振问题 .对数值计算结果与矩量法逐点求解的结果进行了比较 ,两者吻合良好 ,且计算效率提高了约一个数量级 相似文献
6.
内谐振条件下导体散射特性的双正交模法分析 总被引:2,自引:0,他引:2
众所周知,当我们应用积分方程,不论是电场积分方程还是磁场积分方程,去分析导体的散射特性时,在内谐振条件下将出现解答的不唯一性或不稳性问题,给计算工作带来严重的困难。本文提出的双正交模分析方法有效地克服了这一困难,且该方法具有使用简单和概念清晰的优点。若干数值计算实例表明了该方法的正确性和有效性。 相似文献
7.
8.
利用图形处理单元(GPU)加速混合场积分方程(CFIE)分析导体目标电磁散射问题。较电场积分方程(EFIE)和磁场积分方程(MFIE),CFIE消除了内谐振问题,并且具有更好的条件数。求解的数值方法为基于 RWG基函数的矩量法(MoM)。所有计算步骤均在 GPU上实现,包括:阻抗元素填充、电压向量填充、矩阵方程的共轭梯度(CG)求解、雷达散射截面(RCS)计算。在保证数值精确度的前提下获得了数十倍的速度提升。 相似文献
9.
10.
11.
12.
本文从电场积分方程出发,经傅氏变换,并分离出电荷对散射场的贡献,导出了平面波投射于同心圆盘-圆环结构时,分析散射场的一个形式简单且便于求解的积分方程。当平面波正投射时解法尤为简单。据此求解圆盘和/或圆环结构上感应电流分布和相应的散射场。为验证本方法的准确性,对圆盘雷达散射截面(RCS)的计算结果与精确解进行了比较,结果吻合很好。文中还给出了当平面波正投射时,同心圆盘-圆环结构上感应电流各分量的幅度分布和散射场分布。 相似文献
13.
A comparison of integral equations, for problems involving scattering by arbitrary-shape conducting bodies, having a unique solution in the resonance region is presented. The augmented electric and magnetic field integral equations and the combined field integral equation, in their exact and approximate versions, are considered. The integral equations and the basis and test functions used in the method of moments to solve them are reviewed. Their implementation in a computer code is analyzed, mainly the relation between the matrix properties and the CPU time and memory. Numerical results (condition number and backscattering cross section) are presented for the cube. It is shown that the combined field integral equation, and the approximate (symmetric) combined field integral equation, are the most efficient equations to use in the neighborhood of resonant frequencies, because the overdetermined augmented integral equations require an extra matrix multiplication 相似文献
14.
The Volume-Surface Current Continuity Method (VSCCM) is presented to analyze electromagnetic radiation from microstrip antenna. The microstrip antenna is discretized into small triangular patches on conducting surface and tetrahedral volume cells in dielectric region. The Method of Moments (MoM) is applied to solve the integral equation. An equation contains the restriction relation between the volume and surface current coefficient is derived from the current continuity equation at those parts where the conducting surface is in contact with the dielectric material. A simple equivalent strip model is introduced in the treatment of the feeding probe in VSCCM. The VSCCM can reduce the unknowns required to be solved in MoM, as well as the condition number of the matrix equation. Numerical results are given to validate the accuracy and efficiency of this method. 相似文献
15.
16.
A new symmetric formulation of the hybrid finite element method (HFEM) is described which combines elements of the electric field integral equation (EFIE) and the magnetic field integral equation (MFIE) for the exterior region along with the finite element solution for the interior region. The formulation is applied to scattering by inhomogeneous bodies of revolution. To avoid spurious modes in the interior region a combination of vector and nodal based finite elements are used. Integral equations in the exterior region are used to enforce the Sommerfeld radiation condition by matching both the tangential electric and magnetic fields between interior and exterior regions. Results from this symmetric formulation as well as formulations based solely on the EFIE or MFIE are compared to exact series solutions and integral equation solutions for a number of examples. The behaviors of the symmetric, EFIE, and MFIE solutions are examined at potential resonant frequencies of the interior and exterior regions, demonstrating the advantage of this symmetric formulation 相似文献
17.
Jean-Fu Kiang 《Antennas and Propagation, IEEE Transactions on》1995,43(12):1361-1368
In this paper, we analyze the effect of a laminated ground plane on the resonance frequency of rectangular patch resonators. We model each lamina of the ground plane as an anisotropic layer and use a transition matrix to relate the tangential field components in different laminae. An integral equation is formulated in the spectral domain, and Galerkin's method is applied to solve the integral equation for the resonance frequencies of the patch resonator. A perturbation approach is also derived for comparison. The effects of substrate dielectric are studied. The resonance frequency variation thus obtained will be useful in designing patch resonators attached to composite laminated surfaces 相似文献