精确稳定的时域积分方程方法在求解复杂线面结合问题中的应用

Solving the Complex Wire-Surface Junction Problems Based on An Accurate and Stable Time Domain Integral Equation Method

本文采用了时间步进算法(MOT)求解时域线面结合积分方程(TDSWIE),以解决金属平台和复杂线天线结合这种组合目标问题.为了提高该算法的精度和数值稳定性,文中采用了精确计算阻抗矩阵元素值的方式.对单级子天线放置在金属球面以及螺旋天线放置在圆台形天线基座等进行数值仿真,获得了天线与基座结合处的瞬态电流值、天线的回波损耗(S11)、天线的输入导纳以及方向图等重要参数.数值结果验证了本文方法的有效性和精确性.

Marching-on-in time （MOT） method is used to solve the time domain surface-wire integral equation （TDSWIE） , so that we can solve complex problems ,such as wire antennas mounted on the perfect electrically conducting （PEC） surfaces ,etc . In order to improve the late-time stability of the method ,an efficient scheme based on accurately calculating the elements of the impedance matrix is adopted .In the numerical simulations of a dipole antenna mounted on a PEC sphere and a spiral antenna mount-ed on a PEC antenna pedestal ,the transient surface current ,S11 parameter ,the input admittance and the directivities of the antennas are obtained .Numerical results demonstrate the efficiency and accuracy of this method .