探针馈电圆柱共形微带天线阻抗特性的FDTD法分析

将圆柱坐标系下非分裂式理想匹配层吸收边界条件(UPML)引入到圆柱共形微带天线的全波分析中，并给出了其中的场量迭代方程，明显地减小了计算空间，简化了编程；提出了圆柱坐标系下考虑有限尺寸探针半径的新算法，使得计算结果更加精确；应用GPOF方法预估了时域晚时响应，使计算时间减少了70％～90％。本文给出的模型能够对任意多层圆柱共形结构的微带天线进行计算，因此对此类天线的CAD设计具有实际意义。

FDTD Analysis of the Impedance Characteristics of the Probe-fed Cylindrically Conformal Microstrip Antennas

The unsplit perfectly matched layer (UPML) absorbing boundary condition in cylin drical coordinate is adopted in the full-wave FDTD analysis of cylindrically co nformal microstrip antennas to minimize the computational domain and to simplify the programming, the iterative equations in UPML are also given; the thin-wire algorithm for consideration of the effect of the radius of the feeding probe in cylindrical coordinate is derived to make the simulation results more precise; the computational time is reduced by the order of 70%~90% using the GPOF method to predict the late-time response in time domain. The numerical model in this p aper can be used to simulate the microstrip antennas in arbitrary cylindrically conformal structure, which is very important for CAD of this type of antenna.