长线缆对超宽谱辐照的终端响应

Terminal Response of Long Transmission Line Under Radiation of the UWS-HPM

为解决线缆终端设备电磁防护问题,用基于传统TL理论模型的非均匀场强计算方法计算了长线缆对超宽谱高功率微波的终端响应。该方法引入超宽谱的电场峰值传播公式到计算公式中,求得线缆上感应的电流、电压的频域表达式后,通过Fourier反变换得到电流、电压的时域波形。该方法解决了传统方法在计算长线缆响应距离较近的非平面波辐射源误差较大的问题,使得线缆所在空间更加接近于实际的电磁环境。通过与实验结果相比对,证实了该方法的精确性。

Cable is one of the most important coupling channels of electromagnetic pulse. In order to solve the problem of electromagnetic protection of equipment in cable terminal, the terminal response of cable under various electromagnetic interference source should be researched. UWS-HPM is one of important electromagnetic interference sources. The classical transmission line （TL） algorithm is very effective and convenient in calculating the response of short cable under radiation of NEMP from high altitude. But electromagnetic waves are regarded as plane waves and electric-field intensity of the space to contain line is regarded as uniform in calculating motivation coupling of cable using this algorithm, so it has rather remarkable inaccuracy in calculating the response of long cable under radiation of the UWS-HPM of short distance. Consequently, a new algorithm of non-uniform of electric-field intensity of UWS-HPM base on classical TL algorithm was presented, introducing propagation equation of peak-peak E-field of UWS-HPM into this algorithm. The frequency-domain expressions of induced current and voltage in cable terminal were figured out in this algorithm firstly. Then induced waveforms of time-domain were figured out by the Fourier inverse transform, and the cable＇s terminal responses of experiment and simulation calculation were compared . The relationship of response voltage and length of cable was also analyzed. The result shows that the error of the algorithm of non-uniform is less than that of the TL algorithm.