用时域有限差分方法分析轴对称天线辐射特性

Analysis of the radiation for an axiallysymmetric antennaby the FDTD method

应用时域有限差分方法分析了置于理想导体平面上由同轴线馈电的具有轴对称结构天线的瞬态及稳态辐射特性．通过应用网格共形技术及一维传输线方程模拟同轴线的馈电，并在同轴线口径处计入了馈线与天线之间的相互耦合，大大地缩减了时域有限差分法的计算空间，从而实现了复杂结构与加载情况天线的计算和分析．

The FiniteDifference TimeDomain (FDTD) method is used to analyze the transient and steady state radiation of an axially symmetric antenna placed on an infinite conducting ground. The antenna is fed from a coaxial transmission line. We apply the contour path technique to treat a thin conducting line in FDTD, and use the 1D FDTD method to descrite the voltage and current propagating in the coaxial line. The coupling between the feed line and the antenna loaded is also considered, so that the characteristics of the antenna can be evaluated. The examples demonstrate the applicability and effectivity of this scheme.