一种用天线电流设置抛物线方程初始场的新方法

A New Method by Using Antenna Current to Set Initial Field of Parabolic Equation

主要研究了对数周期天线在电波传播过程中初始场的设置问题。提出了一种用天线电流来设置抛物线方程初始场的新方法,解决了传统初始场设置方法在天线架高较低时口面难以支撑所需要的初始场的问题,建立了抛物线方程初始场设置与天线电流分布之间的直接联系。利用该方法,计算了两组对数周期天线不同条件下的传播因子,验证了该方法的可行性和有效性。

In this paper,the problem about setting initial field of log-periodic dipole antenna（LPDA）in electromagnetic wave propa-gation is studied. A new method that uses antenna current to set initial field of parabolic equation has been proposed,which solved theproblem that the aperture cannot support the initial field in low mounted height of antenna conditions through traditional methods. A di-rect connection has been built between initial field and antenna current distribution. Using the new method,propagation factors of twopairs of LPDA under different conditions are calculated,and the results show the new method＇s feasibility and effectiveness.