共查询到17条相似文献,搜索用时 234 毫秒
1.
2.
3.
4.
5.
本文探讨了广义多极子技术(GMT)不能处理理想导体尖锐棱边散射问题的根源,并引入有限差分技术,使之与GMT结合形成了可有效处理这类散射问题的混合分析技术,文中算例证明了所得方法的可靠性和有效性。 相似文献
6.
本文从电磁场的复玻印廷定理出发,对由多根天线组成的天线系统的广义谐振行为进行了深入的研究,揭示开放系统中广义谐振发生的条件和矩阵描述.在此基础上,导出天线系统的广义Foster定理和表征广义谐振的网络Q值.研究实例表明,广义谐振在近场区可表现出强场尖峰效应,在远场区可表现出超方向特性。 相似文献
7.
本文探讨了广义极子技术不能理想导体尖锐棱边射问题的根源,并引入有限差分技术,使之与GMT结合形成了可有效处理这类散射问题的混合分析技术,文中算例证明了所得方法的可靠性和有效性。 相似文献
8.
9.
10.
如何利用散射体的几何对称性,使各种矩阵方法求解电磁散射问题所需的存储量和计算时间减少,是当前计算电磁学领域中具有理论和实际意义的重要课题.本文针对谐振频段的TM波对介质柱体的散射问题,采用矩阵方法与GIM(广义镜像法)技术相结合的算法,通过构造虚拟的对称源与反对称源和运用叠加定理,成功地将原问题的求解转化为只在其1/4的边界上进行求解,由此达到了减少矩阵元和节约运算时间的目的.通过理论分析和具体算例的检验,并与MOM计算结果比较,证实了该方法在节约计算时间方面有显著优势. 相似文献
11.
The basal ganglia have been implicated in a modulation role in idiopathic generalized epilepsy (IGE) by an invasive electrophysioigic means.This paper investigates the basal ganglia functional connectivity by using the region-wise functional connection analysis in resting-state functional magnetic resonance imaging (fMRi) in IGE.The increased functional connectivity within basal ganglia,and between the basal ganglia and the thalamus,and decreased functional connectivity between basal ganglia and motor cortex are found in IGE compared with the controls. These findings not only implicate dysfunctional integration in the motor loop in IGE and the enhanced interaction in the modulated loop,but also suggest that the basal ganglia modulate the generalized epileptic discharges with the influence over thalamus in the corticothalamus network. 相似文献
12.
13.
针对粒子滤波中重采样过程与优化提议分布的处理方式导致的粒子溃退和算法实时性下降问题,通过广义UT变换原理和卡尔曼滤波预测更新机制的引入,实现当前量测信息对于状态估计结果的直接优化,给出了一种基于广义UT变换的粒子滤波算法。另外,将改进后算法与交互式多模型相结合,进而提出了一种基于广义UT变换的交互式多模型粒子滤波算法.理论分析和仿真结果表明:新算法在计算复杂度方面与标准粒子滤波相近,在滤波精度方面优于标准粒子滤波及其改进算法. 相似文献
14.
《Microwave Theory and Techniques》2006,54(10):3739-3745
An efficient and rigorous numerical method, based on the spatial-domain method of moments (MoM) in conjunction with the closed-form Green's functions, is devised for the analysis of multiple vertical conductors in printed circuits. As this combination has already proven to be very efficient for the analysis of printed structures with horizontal and vertical conductors, it is extended to efficiently handle multiple vertical conductors. Some circuits with multiple vertical strips are analyzed using the proposed method, and results are compared either to those presented in the literature or to those obtained from the commercial software em by SONNET Software, North Syracuse, NY. Computational efficiency of the algorithm is assessed in terms of CPU time, and it is observed that the computational cost of the proposed algorithm is an order of magnitude less than that of the straightforward implementation of the underlaying method of the algorithm—the spatial-domain MOM using closed-form Green's functions. 相似文献
15.
提出了一种基于BLT(Baum-Liu-Tesche)方程的平面波辐照下金属腔贯通导线电磁干扰分析的快速计算方法.首先采用电磁拓扑理论将整个问题进行拓扑分解,根据场线耦合理论获得场线耦合节点的传输函数,进而采用广义BLT方程获得外界电磁波与贯通导线相互作用时金属腔内终端负载上的干扰电流.将该算法用于贯通单导线、贯通双导线和贯通传输线网络电磁干扰问题分析,计算获得的终端负载上感应电流结果与全波分析方法结果吻合较好,证明了该快速算法的有效性.该快速算法计算时间仅为全波分析法的万分之一,且所占内存相比全波分析法缩小了几十倍. 相似文献
16.
《Microwave Theory and Techniques》1984,32(11):1441-1448
A method for computing the electrostatic fields and the capacitance matrix for a multiconductor system in a multiple dielectric region is presented. The number of conductors and the number of dielectrics in this analysis are arbitrary. Some of the conductors maybe of finite volume and others may be infinitesimally thin. The conductors can be either above a single ground plane or between two parallel ground planes. The formulation is obtained by using a free-space Green's function in conjunction with total charge on the conductor-to-dielectric interfaces and polarization charge on the dielectric-to-dielectric interfaces. The solution is effected by the method of moments using triangular subdomains with piecewise constant expansion functions and point matching for testing. Computed results are given for some finite-length conducting lines, compared to previous results obtained by two-dimensional analysis. 相似文献
17.
无源谐振腔的有效谐振频率(被测得谐振频率)偏移作为参考的基模谐振频率的效应是谐振腔中存在的高阶横模所引起的。由光探测器光接收孔径的有限性或表面的不均匀性而导致各阶横模的空间不正交性,是引起谐振频率偏移效应的主要原因。对此作了详细研究,并对计算结果进行了讨论,总结出谐振频率偏移与谐振腔各参量的相互关系,从而提出减小这种效应的有效措施。 相似文献