用镜像法计算冲击脉冲辐射天线辐射电场

Radiated Electric Field Calculation of Impulse Radiating Antenna Applying Image Method

为方便地计算抛物面冲击脉冲辐射天线的辐射电场,根据由张量法得到的任意的线天线电场计算公式,利用镜像法推导得到了冲击脉冲辐射天线辐射电场的时域解析表达式;搭建了超宽带电磁脉冲实验系统,由横电磁波喇叭天线测试场设备测试抛物反射面超宽带辐射天线产生的辐射场;应用解析表达式计算了该实验系统的时域辐射场,并与实验测试结果进行了比较。结果表明解析计算得到的辐射场波形与测试结果能够较好地符合,峰峰值相差<1V,上升时间相差≤5ps,说明了解析计算的正确性。

In order to conveniently calculate the electric radiation field of impulse radiation antenna with parabolic reflector, an analytical expression of the radiation in time domain was obtained. The expression was derived by using mirror image method based on the field expression of arbitrary wire antennas obtained by the tensor method. An ultra-wideband {UWB） electromagnetic pulse experiment system was built for the purpose of verification. The system used transverse electromagnetic （TEM） horn antenna to measure the radiation field generated by impulse radiation antenna（IRA）. The tested results were compared with the radiation field in calculated time domain. It is found that the analytically calculated field waveforms are in good agreement with the experiment results, the peakto-peak error is less than 1 V, and the rise-time error is not more than 5 ps. Consequenly the validity of analytical calculation is proved.