近地对数周期偶极天线的分析

Analysis of the Log-periodic Dipole Antennas over a Ground Plane

采用矩量法结合离散复镜像法求解近地对数周期偶极天线的电流分布 ,用基于驻相法的远场Som merfeld积分近似公式求解辐射场。在计算广义阻抗矩阵元素时 ,利用矩阵的互易性和天线阵的结构对称性进行了算法优化 。

The paper applies the moment method and discrete complex image method to determine the distribution current of log periodic antennas over a ground plane , applies the far field approximation of the Sommerfeld integral based on the stationary phase method to determine the radiation patterns. Benifiting the symmety and the reciprocity of the general ized matrix, only a few elements of the generalized matrix need evaluated. After the optimizing for the algorithm, the calculating time can be decreased evidently .