线板结构辐射发射分析与研究

电磁兼容实验和实际电子设备中存在较多的线板结构,而电子设备的低频(30~200 MHz)电磁辐射发射主要通过这种结构辐射出去。因此,通过美军标MIL-STD-461F实验对这种线板结构进行了研究,采用全波电磁仿真和实际测试相结合的方法分析线板结构参数对电磁辐射结果的影响。首先仿真了双锥天线及其天线系数并与校准的结果进行了对比;然后仿真了天线处于不同极化方式时,线缆距离金属板的高度和线缆长度等参数对辐射发射的影响,并与实验结果进行了对比。研究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,进而更好地进行电磁兼容设计。

Analysis and Research of Radiated Emission from Cable-plane Structure

Many cable-plane structures exist in electromagnetic compatibility test and electronic equipment. The low frequency (30MHz-200MHz) electromagnetic radiation emission of electronic equipment is mainly dominated by this structure. This paper researches the structure through the experiment of MIL-STD-461F, utilizes the full wave simulation and actual test to analyze the influence of cable-plane structure parameters on electromagnetic radiation results. Firstly, this paper simulates the biconical antenna and its antenna factor and then compared to the calibration results; then simulates when the antenna is in different polarization mode, the effects of height distance from cable to metal plate and the length of the cable on the radiation level result, and compared to the experimental results. This paper is beneficial to EMC engineer to understand electromagnetic radiation level from electronic equipment, and then make better EMC design.