低反射电阻阵列加载单锥TEM室研制与测试

Research on Low Reflection Resistively Loaded Monocone TEM Cell

为了减小单锥末端反射、拓展镜面单锥TEM室时间窗,基于母线长0.9 m单锥TEM室计算了不同电阻加载条件下的馈电端口电压反射系数,通过搭建电阻阵列加载单锥TEM室实验平台对仿真结果进行了验证,在此基础上,通过改进锥体吊装结构、调整镜面板与吸波材料之间距离等方式对单锥结构进行了优化,设计并研制了国内首个低反射单锥微波暗室。研究结果表明,在单锥锥体末端与镜面板边缘之间加载阻抗匹配回路,解决了单锥TEM室低频吸收问题,减小了单锥TEM室末端反射,突破了由母线长度决定的时间窗限制,拓展了单锥TEM室的适用范围,实现了HEMP、LEMP等瞬态电磁脉冲传感器幅值灵敏度和波形保真度的全校准。

In order to reduce the reflection from either the end of the monocone or the edge of ground plane and expand the time window of the mirror monocone TEM cell,the voltage reflection coefficients of the feed port under different re-sistively loaded conditions were calculated based on the 0.9 m monocone TEM cell,and the simulation results were verified by building a resistor array loaded monocone TEM cell experimental platform.The first low-reflection monocone microwave anechoic chamber in China was designed and built by optimizing the structure of the monocone TEM cell on the basis of improving the cone support structure and adjusting the distance between the ground plane and the absorbing material.The results show that loading resistor array between the end of the cone and the edge of ground plane can reduce the reflections at the end of the monocone TEM cell,breaks through the time window limit that is determined by the length of the cone,expands the application scope of the monocone TEM cell,and realizes full calibration of amplitude sensitivity and waveform fidelity of HEMP,LEMP and other transient electromagnetic pulse sensors.