定向辐射式核电磁脉冲场模拟器的研制

针对大型受试设备核电磁脉冲抗扰度试验评估要求，研制了基于Marx发生器脉冲源和横电磁波（Transverse Electro Magnetic，TEM）喇叭天线的可移动、极化方向可调的定向辐射式核电磁脉冲模拟器.实验分析了不同极化方向和终端负载对脉冲波形的影响，确定了定向辐射式核电磁脉冲模拟器的均匀区域.结果表明:辐射电磁脉冲场可用区域为近场区域，随着与口径面距离的增大，峰值场强近似按1/d2衰减，脉冲宽度显著减小；与传输式模拟器相比，辐射式核电磁脉冲模拟器具有更大的均匀区域，更适合大型设备电磁脉冲抗扰度试验.

Research on directional radiation HEMP simulator

In order to test the high-altitude electromagnetic pulse(HEMP) immunity for the large equipment under test(EUT), a new moveable and polarizable HEMP radiation simulator is designed based on Marx generator and TEM antenna.In this paper, the effects of antenna polarization direction and terminal load to pulse waveform are studied by experimental method, and the uniform zone of the HEMP radiating wave simulator is determined by actual measurement.The results show that the usable test zone of the HEMP radiating wave simulator is the near field zone, and in the test zone the peak field strength decreases in accordance with 1/d2, and the pulse width decreases with the distance increasing away the aperture plane of the antenna.In comparison with the transmission HEMP simulator, the HEMP radiating wave simulator has a larger uniform test zone, which is more appropriate for testing HEMP immunity for large EUT.