摘要
针对射频电磁场辐射抗扰度测试天线在低频时辐射效率低,难以形成高电场强度的问题,设计了一款电容式场发生器天线。该场发生器天线采用1∶9的传输线变压器来实现输入端口与负载的阻抗匹配,并采用平行双臂金属杆实现电容式近场分布。为保证电气性能稳定,负载采用无感陶磁电阻并设计有专门的散热背包,使其能够承受2400W的输入功率。仿真结果表明,该场发生器天线在近场范围内电场强度分布均匀,实测结果显示其在10 k Hz~30 MHz的频率范围内具有良好的电压驻波比(VSWR≤1.6),且在距离天线中心1 m处可产生50 V/m的电场强度,而在0.3 m处更可以产生200 V/m的电场强度,能够满足国内外辐射抗扰度测试标准要求。
A capacitive field generator is designed for the electromagnetic field radiation immunity test,which can solve the problems of low radiation efficiency and difficulty in forming a high electric field strength at low frequencies.The field generator antenna uses a 1∶9 transmission line transformer to achieve impedance matching between the input port and the load,and uses parallel double-armed metal rods to realize capacitive near-field distributions.In order to ensure the stable electrical performances,non-inductive ceramic resistors are adopted as the load,and a special heat dissipation backpack is designed to improve the power handling capacity(2400 W).The simulation results show that the electric field intensity dis-tribution of the field generator is uniform in the near-field range,and the measurement results demonstrate that it has a good voltage standing wave ratio(VSWR≤1.6)in the frequency band of 10 kHz~30 MHz,and the electric field strength can a-chieve 50 V/m at a distance of 1 m from the center of the antenna.At a distance of 0.3 meters the electric field strength can even achieve 200 V/m,which can satisfy the requirements of most of domestic and foreign radiation immunity test standards.
作者
陈亮凡
吴钟杰
赵李刚
王正斌
CHEN Liang-fan;WU Zhong-jie;ZHAO Li-gang;WANG Zheng-bin(College of Electronic and Optical Engineering&College of Flexible Electronics,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;Lorentz EM Technology Co.,Ltd.,Nanjing 211106,China;Hainan Telecom Co.,Ltd.,Haikou 570105,China)
出处
《微波学报》
CSCD
北大核心
2023年第6期88-91,100,共5页
Journal of Microwaves
基金
毫米波国家重点实验室开放课题(K201926)
江苏省研究生实践创新计划(SJCX23_0267)。
关键词
电场发生器
传输线变压器
电磁兼容
电磁敏感度
辐射抗扰度
electric field generator
transmission line transformer
electromagnetic compatibility
electromagnetic susceptibility
radiation immunity
