电磁兼容低频辐射发射测试方法分析与研究

发布时间：2019-06-07 13:21

【摘要】：低频段电磁辐射发射测试是电磁兼容性分析的重要组成部分,由于在低频段电磁波的波长与设备线缆的长度可比拟,电磁辐射发射主要通过设备供电线缆和设备之间互联线缆辐射出去。同时工作在低频段的各类设备非常多,设备之间的电磁干扰问题十分严重,故对工作在低频段的设备进行电磁辐射发射测试分析显得十分重要。然而在测试中接收天线与待测设备、接收机之间存在相互耦合的现象,最终会影响接收天线端口的电压,导致测试结果产生较大的误差,直接影响到对待测设备电磁兼容性的精确判断。本文围绕低频段辐射发射的测试方法展开研究,选取电磁兼容测试中典型的线板结构对测试方法进行分析,分别从全波电磁仿真和实验测试两个方面进行阐述。本论文的主要研究内容和总结如下:首先运用有源拉杆天线对低频段辐射发射的测试方法进行研究,分别运用电磁仿真和实验测试的方法分析了新旧军标模式下拉杆天线的接地方式对电场辐射发射测试结果的影响。其次对影响低频段电场辐射发射测试精确度的因素进行了讨论,对于电磁兼容军用测试标准的修改有推进作用。最后,本文介绍了针对低频段辐射发射场的预估计方法,转移函数法以及优化方法—一多段转移函数法,优化算法能够有效地降低产品研发阶段的费用。此外,本文基于标准的双锥天线对电场辐射发射的测试方法进行研究,采用全波电磁仿真和实际测试相结合的方法分析低频辐射发射测试中线缆距离金属板的高度和线缆长度等对低频段电场辐射发射的影响,有助于电磁兼容工程师更好的理解电子设备电磁辐射水平,进而更好的进行电磁兼容设计。
[Abstract]:The measurement of electromagnetic radiation emission in low frequency band is an important part of electromagnetic compatibility analysis, because the wavelength of electromagnetic wave in low frequency band is comparable to the length of equipment cable. Electromagnetic radiation emission is mainly radiated through the equipment power supply cable and the interconnection cable between the equipment. At the same time, there are many kinds of equipment working in the low frequency band, and the electromagnetic interference problem between the equipment is very serious, so it is very important to test and analyze the electromagnetic radiation emission of the equipment working in the low frequency band. However, in the test, there is a phenomenon of coupling between the receiving antenna and the equipment to be tested, which will eventually affect the voltage of the receiving antenna port, resulting in a large error in the test results. It directly affects the accurate judgment of electromagnetic compatibility of measuring equipment. In this paper, the testing method of low frequency band radiation emission is studied, and the typical wire board structure in electromagnetic compatibility test is selected to analyze the test method, and the full wave electromagnetic simulation and experimental test are described respectively. The main research contents and summary of this paper are as follows: firstly, the testing method of low frequency band radiation emission is studied by using active pull rod antenna. The influence of grounding mode of pull rod antenna in new and old military standard mode on the test results of electric field radiation is analyzed by means of electromagnetic simulation and experimental test respectively. Secondly, the factors that affect the accuracy of low frequency band electric field radiation emission test are discussed, which can promote the modification of electromagnetic compatibility military test standard. Finally, this paper introduces the prediction method, transfer function method and optimization method-one-stage transfer function method for low-frequency radiation emission field. The optimization algorithm can effectively reduce the cost of product development stage. In addition, based on the standard double cone antenna, the measurement method of electric field radiation emission is studied in this paper. The influence of the height of the middle line cable from the metal plate and the cable length on the low frequency band electric field radiation emission is analyzed by using the method of full wave electromagnetic simulation and practical test. It is helpful for electromagnetic compatibility engineers to better understand the electromagnetic radiation level of electronic equipment, and then to better design electromagnetic compatibility.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN03;TN820

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