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。 In this paper, the ideal matching layer (PML) absorption boundary conditions are used in FDTD analysis of planar microstrip structures. The PML absorption boundary conditions of planar microstrip structures are given and the program is programmed and numerically calculated. The results show that, compared with the traditional Mur absorbing boundary conditions, the PML absorbing boundary conditions can reduce the computational mesh space and accelerate the convergence speed by using the simplest feed model, and can be used to analyze any complex structure Microstrip circuit. The method proposed in this paper will have practical significance for CAD design of microstrip circuit and microstrip antenna.