EMI near-field array measurement and spatial analysis in open test filed

Abstract

Abstract: In order to improve the efficiency, accuracy and scale of measuring the radiated electromagnetic interference (EMI), an improved electric ringlet probe is designed and used to construct an electric ringlet probe array for EMI near-field measurement. By changing different height, distance and power parameters, an open near-field test environment of co-channel interference and in-band interference of dual signals is constructed. According to the actual measurement data, the radiation distribution of E-plane and H-plane of the tested omnidirectional antenna and directional antenna is visually displayed, and the spatial distribution state of the radiated signal is reconstructed. The radiated interference states under different interference distance, different interference power, co-channel interference and in-band interference are depicted, and the changing trends of interference under these different conditions are compared. It is found that the closer the interference distance, the greater the interference power, and the greater the intensity of radiated interference. In addition, the influence of the co-channel interference on the interference state is greater than that of the in-band interference. The near-field measurement probe array can realize the judgment of radiation interference and interference mode, which has a relatively wide range of engineering application value.

Key words: near-field measurement, probe array, radiation intensity distribution, interference state analysis

CLC Number:

TM937
TN820

GONG Fengxun, HE Ruirui. EMI near-field array measurement and spatial analysis in open test filed[J]. Journal of Civil Aviation University of China, 2022, 40(4): 1-9.

References 17

[1]	李伟, 魏光辉, 孙梳清, 等. 通信装备随机噪声电磁辐射效应预测方法[J]. 北京理工大学学报, 2019, 39(11): 1167-1172.
[2]	李伶研, 高振斌, 宋涛, 等. 电磁近场探测扫描系统的设计与实现[J].河北工业大学学报, 2018, 47(2): 14-19.
[3]	陈嘉祥. 电磁兼容近场测试系统设计及近场探头对被测场影响的研究[D]. 北京: 北京交通大学, 2017.
[4]	李伟. 电磁场近场扫描阵列天线系统的研究与设计[D]. 北京: 北京邮电大学, 2013.
[5]	李瑶. 拓展低频带宽的电磁干扰近场扫描测量系统设计[D]. 西安: 西安电子科技大学, 2019.
[6]	LI G H, CHEN H, CHEN J H． SG128 multi-probe spherical near-field antenna test range and novel antenna measurements[C]//7th Internation－ al Conference on Communications and Networking in China, August 810, 2012, Kunming, China． IEEE, 2012: 689-693．
[7]	KITTIWITTAYAPONG S, PHAEBUA K, SITTITHAI P, et al． Low-cost planar near-field to far-field measurement system for a small antenna [C]//2016 13th International Conference on Electrical Engineering/ Electronics, Computer, Telecommunications and Information Techno logy(ECTI-CON), June 28-July 1, 2016, Chiang Mai, Thailand． IEEE, 2016: 1-3．
[8]	魏光辉, 纪凯夫, 孟令媛. 效应物置入对环境电磁辐射场强测试的影响[J]. 北京理工大学学报, 2019, 39(11): 1173-1179, 1186.
[9]	陈柏燊. 阵列天线设计及非线性校准技术研究[D]. 成都: 电子科技大学, 2017.
[10]	YANG G W, LI J Y, ZHOU S G, et al． A wide-angle E-plane scanning linear array antenna with wide beam elements[J]． IEEE Antennas and Wireless Propagation Letters, 2017, 16: 2923-2926．
[11]	罗雪. 基于降低互耦影响的二维稀疏阵优化设计[J]. 北京理工大学学报, 2020, 40(5): 531-536.
[12]	王琳. 基于紧耦合结构的天线阵列技术研究[D]. 西安: 西安电子科技大学, 2019.
[13]	NAKAMURA S, IWAZAKI S, ICHIGE K． An optimum 2D sparse array configuration with reduced mutual coupling [C]//2018 International Symposium on Antennas and Propagation(ISAP), October 23-26, 2018, Busan, Korea(South)． IEEE, 2018: 1-2．
[14]	ARAI H, SUZUKI R． Cross scanning near field measurement for sym－ metrical planar array[C]//2018 IEEE Conference on Antenna Measure－ ments & Applications, September 3-6, 2018, Sweden． IEEE, 2018: 1-2．
[15]	李燕. 宽带宽角扫描相控阵天线研究[D]. 成都: 电子科技大学, 2020.
[16]	宋嘉奇, 陶海红. 一种稀布阵列天线的近场波束综合算法[J]. 西安电子科技大学学报, 2018, 45(6): 14-18.
[17]	白会新, 马振洋, 王志武, 等. 射频前端基准电流源低电压抗电磁干扰设计[J]. 中国民航大学学报, 2017, 35(4): 51-53, 61.