有限尺寸导电平板近旁偶极天线的时域辐射特性

Time Domain Radiation Characteristics of a Dipole Near a Finite Conducting Plate

本文用时间步进法求解以高斯脉冲波激励的偶极天线的线电流密度和近旁有限尺寸导电平板上的面电流密度为未知函数的时域电场型积分—微分方程组,分析了平板对天线输入电流和远区辐射场的影响,与无限大板的情形作了比较。针对时间步进法计算中后期响应时出现的波形振荡现象,采用了对电流波形进行分段多次平滑的数值处理技术,取得了良好的效果。计算表明这一数值处理技术对于克服时间步进法在计算中后期响应时的固有困难具有普遍推广的意义。

The time domain current distribution and radiation characteristics of a dipole near a finite conducting plate are investigated by solving the time domain electric field integrodifferential equations with the time stepping approach. The differences of the effects between the finite and infinite reflecting plates on the transient input currents and far radiation fields of the near pulse antennas are analyzed. A numerical technique is presented and adopted to eliminate the oscillations at later response time.