三维PML吸收边界条件在微带线不连续性问题分析中的应用

将完全匹配层(PML)吸收边界条件从求解二维TE/TM模问题推广到求解三维混合模传输线问题.通过对各种三维微带线不连续性结构散射特性的计算表明,文中给出的电磁PML吸收边界条件保持了二维情况下宽带、高精度的优点,在复杂结构的FDTD分析中具有重要的实用意义.     

波导模场分布采用模式匹配的PML处理方法

理想匹配层(PML)是近年来迅速发展起来的一种非常有效的吸收边界.本文基于模式匹配法将PML吸收边界条件用于平面光波导结构计算中,从理论上分析了PML吸收边界条件的有效性,并在PML边界条件下模拟计算了一个三段平面光波导结构的模场分布.     

PML吸收边界条件在波导不连续性问题中的应用

采用矢量有限元方法结合PML吸收边界条件分析波导不连续性问题。利用PML吸收边界条件截断计算区域,可以减少内存消耗;采用模式正交性计算波导结构的S参数,可以获得更加精确的解。在结果验证阶段,分别对PML参数设置、厚度选择、波导介质不连续性以及波导结构不连续性模型进行分析,将计算结果与文献对比,验证了PML吸收边界条件的有限元法分析波导不连续性问题的准确性。     

CFS-PML边界条件在PSTD算法中的实现与性能分析

文中将具有复频率参数的PML(CFS-PML)边界条件引入到时域伪谱(PSTD)算法中，并利用卷积PML(CPML)方法予以实现，CPML的吸收性能作为时间的函数被给出。与传统PML相比，该边界条件不仅可以吸收传播模，而且还可以吸收低频凋落模。仿真结果也表明，CPML中参数α，Kmax在一定范围内取值可使该边界的反射误差得到最小。     

理想匹配层及模式匹配法分新多段平面光波导结构

将理想匹配层(PML)吸收边界条件和模式匹配法用于多段平面光波导结构分析,给出了一种改进的平面光波导结构的PML吸收边界条件,并对光波导的光场分布进行数值模拟,所得结果表明了PML吸收边界条件应用于多段平面光波导结构分析的有效性.该方法也可用于分析复杂结构的平面光波导.     

理想匹配层及模式匹配法分析多段平面光波导结构

将理想匹配层（PML）吸收边界条件和模式匹配法用于多段平面光波导结构分析，给出了一种改进的平面光波导结构的PML吸收边界条件，并对光波导的光场分布进行数值模拟，所得结果表明了PML吸收边界条件应用于多段平面光波导结构分析的有效性。该方法也可用于分析复杂结构的平面光波导。     

采用PML吸收边界条件的FDTD法在分析平面微带结构中的应用

本文将理想匹配层(PML)吸收边界条件用于平面微带结构的时域有限差分法(FDTD)分析中,给出平面微带结构的PML吸收边界条件,并编制程序,进行数值计算。结果表明,与传统的Mur吸收边界条件相比,采用PML吸收边界条件只需采用最简单的馈源模型就可明显地减小计算网格空间和加快收敛速度,并且可用于分析任意复杂结构的微带电路。本文方法对微带电路及微带天线的CAD设计将具有实际意义。     

采用PML吸收边界条件的FDTD法的分析平面微带结构中的应用

本文将理想匹配层（PML）吸收边界条件用于平面微带结构的时域有限差分法（FDTD）分析中,给出平面微带结构的PML吸收边界条件,并编制程序,进行数值计算。结果表明,与传统的Mur吸收边界条件相比,采用PML吸收边界条件只需采用最简单的馈源模型就可明显地减小计算网格空间和加快收敛速度,并且可用于分析任意复杂结构的微带电路。本文方法对微带电路及微带天线的CAD设计将具有实际意义。     

PML—FDTD法在分析平面光波导结构中的应用

将理想匹配层(PML)吸收边界条件用于平面光波导结构的时域有限差分(FDTD)法分析中，给出了平面光波导结构的PML吸收边界条件，并对平行介质带定向耦合器进行数值模拟和验证，所得结果与理论值非常一致，证明了PML吸收边界条件应用于平面光波导结构分析的有效性。本文方法可用于分析任意复杂结构的平面光波导。     

八角格子光子晶体光纤模式和色散特性研究

文章基于带有各向异性完全匹配层(PML)吸收边界条件的紧凑二维频域有限差分法对八角格子光子晶体光纤(O-PCF)的模式和色散特性进行了研究.利用有效面积法分析了八角格子和六角格子光子晶体光纤(H-PCF)的基模和多模截止特性,得到非限制模、基模及多模的相图,比较发现,填充率和空气孔间距相同时,O-PCF的单模运转区域宽于H-PCF,更易用于色散补偿.     

High-performance absorbing boundary conditions for photonic crystalwaveguide simulations

A high-performance absorbing boundary condition is newly developed for the reduction of spurious reflections in photonic crystal (PC) waveguide simulations. The PC waveguide is terminated with a perfectly matched layer (PML) in which the original PC structure remains as is. This PC-based PML works well, compared to a conventional PML, which acts as a homogeneous absorbing medium, simulating a semi-infinite free space and to a distributed-Bragg-reflector waveguide, which was recently developed to reduce reflections from PC waveguide ends, improving a wavenumber matching condition for PC waveguide modes     

PML吸收边界的时域有限差分法的数值色散研究

PML吸收边界以其优异的吸收能力与效果而倍受人们的关注。本文针对运用PML吸收边界的时域有限差分法的数值色散问题进行了研究,并得到了较为满意的结果,PML吸收边界在有效减少电磁 波在边界上的反射的情况下,并没有带来对数值色 散的不良影响。     

Making use of the PML absorbing boundary condition in coupling and scattering FDTD computer codes

This paper deals with the optimization of the PML absorbing boundary condition in finite-difference time-domain computer codes designed for the solution of scattering and coupling problems encountered in the field of electromagnetic compatibility. The critical parameters of the perfectly matched layer (PML) are estimated in function of the problem to be solved, and a blackbox PML concept is introduced. The blackbox PML renders use of computer codes easy, reliable, and optimum in terms of PML thickness. This is illustrated by various numerical experiments.     

Comparative study of absorbing boundary conditions for thetime-domain beam propagation method

Various absorbing boundary conditions (ABCs) are compared in the analysis of the time-domain finite-difference beam propagation method. For a one-dimensional problem, the following ABCs are tested: Higdon's absorbing boundary, Ramahi's complementary operators method (COM), its concurrent version (C-COM) and Berenger's perfectly matched layer (PML). It is found that the second- and third-order C-COMs with three and four boundary cells are comparable to the PMLs with eight and 16 cells, respectively. The effectiveness of the C-COM is also discussed in a two-dimensional problem     

三维新型非分裂场完全匹配层吸收边界条件

研究了一种3D新型时域有限差分法(FDTD)非分裂场近似完全匹配层(NPML)吸收边界。在直角坐标系中,通过直接对麦克斯韦方程组中的空间偏导的变量进行空间坐标拉伸,得到三维非分裂场的NPML吸收边界,这种吸收边界相对于PML吸收边界编程实现简单,编程复杂度低。通过对三维算例的电磁散射分析,验证了NPML吸收边界的正确性。计算结果表明了该方法是一个完美的吸收边界,可以用于实际目标的电磁散射问题分析。     

The Improvement of PML Approach for the Calculation of Microwave and Millimeter Waves Circuit

The improved PML absorbing boundary condition have been introduced in this paper. The reflection coefficient of the absorbing boundary condition is less than the reflection coefficient of Berenger's PML algorithm. And in order to validate the theory and its effectiveness, We have applied the absorbing boundary condition to the calculation of microwave and millimeter waves circuit and get its reflection coefficient S ₁₁. The numerical result is shown in this paper.     

Implementation of anisotropic PML for frequency domain FEM solution of discontinuity in dielectric waveguide

The anisotropic Perfectly Matched Layer(PML) absorbing boundary condition is implemented in a 2-D finite element formulation to solve dielectric waveguide discontinuity problems. The choice of parameters of anisotropic PML has been investigated. Using the boundary truncating technique, the solution process of Finite-Element Method (FEM) has been greatly simplified compared with other hybrid methods. The required computational resources have also significantly declined since the anisotropic PML interface can be placed much closer to the scatterer compared to other well known artificial boundary.     

PML implementation for Laguerre based BOR-FDTD method

A perfectly matched layer (PML) implementation for the unconditionally stable Laguerre based BOR-FDTD is presented. To validate the presented method, the scattering from a PEC cylinder is calculated. Compared with Mur's absorbing boundary, the presented PML shows better absorbing performance.