基于开放式TEM小室的电场探头校准及改进方法  

Electric field probe calibration and improvement method based on open TEM cell

作　　者：王皓琰 李俊娜[1] 龚渝涵 刘建 Wang Haoyan;Li Junna;Gong Yuhan;Liu Jian(Xi’an Jiaotong University,School of Electrical Engineering,Xi’an 710049)

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《强激光与粒子束》2022年第9期9-14,共6页High Power Laser and Particle Beams

基　　金：装备发展共用技术预研项目(80924010203)。

摘　　要：目前的电场探头标定实验大多只考虑TEM小室结构和性能的影响,在校准实验中,探头的放入使得标定结果产生了很大的偏差,相较于TEM小室,电场探头的尺寸是产生误差的主要原因。以开放式TEM小室为基础,考虑了实际模型和电场探头的影响,利用三维电磁仿真软件,从时域角度研究了不同结构和尺寸TEM小室的辐射场分布,并从频域角度对TEM小室的S参数进行分析。比较了探头放入小室前后的误差,并根据计算结果引入了电场的校准公式。为改善探头对电场的影响,设计了一种新型结构,结果表明,新结构在保证带宽的同时,提高了电场的均匀性和探头标定的准确度。Most of the calibration experiments of the electric field probe only consider the influence of the structure and performance of the TEM cell.In the calibration experiment,the placement of the probe makes the calibration result produce a large deviation.Therefore,the main reason for the error is the size of the probe,rather than the TEM cell.Taking the actual model and electric field probe into account,in this paper,the radiation field distribution of TEM cells with different structures and sizes is studied from the time domain perspective based on open TEM cells,while the S-parameters of TEM are analyzed from the frequency domain perspective using 3D electromagnetic simulation software.In addition,this paper compares the errors before and after the probe is placed in the chamber,and introduces the electric field calibration formula based on the calculation results.In order to improve the influence of the probe on the electric field,a new structure was designed.The results show that the new structure not only guarantees the bandwidth,but also improves the uniformity of the electric field and the accuracy of the probe calibration,which provides a new idea for the design of the TEM cell and the calibration of the probe.

关 键 词：TEM小室 电场探头 探头扰动 电场均匀性 校准公式 

分 类 号：O441[理学—电磁学]