含短贯通导体的金属腔体电磁辐射耦合规律

发布时间：2018-01-14 13:00

本文关键词：含短贯通导体的金属腔体电磁辐射耦合规律　出处：《高电压技术》2016年03期 　论文类型：期刊论文

【摘要】：为研究含短贯通导体金属腔体在平面波辐射条件下内部电磁耦合规律,利用电磁数值计算软件CST建立了含短贯通导体金属腔体电磁辐射耦合模型,研究了加载短贯通导体对开孔金属腔体内部屏蔽效能的影响。并基于GHz横电磁波室(gigahertz transverse electromagnetic cell,GTEM)搭建了含短贯通导体金属腔体电磁耦合实验平台,对数值计算结果进行了实验验证。同时分析了平面波辐射条件下贯通导体长度、贯通导体半径、贯通孔尺寸、电场极化方向等参数对内部电磁耦合的影响规律,揭示了短贯通导体引入电磁干扰的耦合机理。结果表明:当屏蔽效能为40 d B的开孔腔体加载短贯通导体后,腔体内部屏蔽效能明显下降,屏蔽效能最小值达到-15.29 d B;腔体外部裸露贯通导体长度增大3 cm,腔体的屏蔽效能降低约4 d B;腔体内部贯通导体长度主要影响腔体的谐振频点;贯通导体长度不变而内外部分长度变化时,腔体屏蔽效能和谐振频点均发生变化;贯通孔尺寸增大,导致腔体内部屏蔽效能下降;测试点距离贯通导体越远,屏蔽效果越好;贯通导体半径能够影响屏蔽效能和腔体谐振频点;腔体壁厚度每增加0.3 cm,谐振频率增大约8 MHz;平行于贯通导体的电场分量越大,腔体屏蔽效能越差。
[Abstract]:In order to study the electromagnetic coupling law of metal cavities with short perforated conductors under plane wave radiation, the electromagnetic radiation coupling model of metal cavities with short perforated conductors is established by using electromagnetic numerical calculation software CST. The effect of loading a short through conductor on the shielding efficiency of a metal cavity with an open hole is studied. The transverse electromagnetic wave chamber (GHz) is used. Gigahertz transverse electromagnetic cell. The experimental platform of electromagnetic coupling of metal cavities with short perforated conductors is built, and the numerical results are verified by experiments. The length and radius of perforated conductors under plane wave radiation are also analyzed. The influence of the size of the through hole and the polarization direction of electric field on the internal electromagnetic coupling. The coupling mechanism of electromagnetic interference in short through conductors is revealed. The results show that the shielding efficiency of a cavity with a shielding efficiency of 40 dB decreases obviously when it is loaded with a short through conductor. The minimum shielding efficiency was -15.29 dB; The shielding efficiency of the cavity is reduced by about 4 dB when the length of the outer exposed perforated conductor increases by 3 cm. The length of the conductor inside the cavity mainly affects the resonant frequency of the cavity. The shielding efficiency and resonant frequency of the cavity are changed when the length of the conductor is constant and the length of the inner and outer parts is changed. The increase of the size of the through hole leads to the decrease of the shielding efficiency in the cavity. The farther the test point is from the through conductor, the better the shielding effect is. Through the conductor radius can affect the shielding efficiency and resonant frequency points of the cavity; When the thickness of the cavity wall increases 0.3 cm, the resonant frequency increases about 8 MHz. The larger the electric field component is, the worse the shielding efficiency of the cavity is.
【作者单位】：电子信息系统复杂电磁环境效应国家重点实验室;军械工程学院静电与电磁防护研究所;
【基金】：国家安全重大基础研究发展计划(613138) 预研项目(51333030101)~~
【分类号】：TN03
【正文快照】： 0引言1随着微电子技术的迅速发展,大规模和超大规——模集成电路得到广泛应用,电子设备在性能提高的同时,对电磁辐射的敏感性和易损性也不断增加[1-2],由于通风散热、供电及信号传输与显示的需要,电子设备机箱不可避免的开有孔缝,当小孔中有贯通导体穿过时,外部电磁场可以直接

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