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孔缝对金属腔体强电磁脉冲耦合特性影响研究

曾美玲 蔡金良 易早 秦风 邝向军

曾美玲, 蔡金良, 易早, 等. 孔缝对金属腔体强电磁脉冲耦合特性影响研究[J]. 强激光与粒子束. doi: 10.11884/HPLPB202133.200336
引用本文: 曾美玲, 蔡金良, 易早, 等. 孔缝对金属腔体强电磁脉冲耦合特性影响研究[J]. 强激光与粒子束. doi: 10.11884/HPLPB202133.200336
Zeng Meiling, Cai Jinliang, Yi Zao, et al. Effect of aperture on shielding performance of metal cavity under excitation of high-intensity electromagnetic pulse[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202133.200336
Citation: Zeng Meiling, Cai Jinliang, Yi Zao, et al. Effect of aperture on shielding performance of metal cavity under excitation of high-intensity electromagnetic pulse[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202133.200336

孔缝对金属腔体强电磁脉冲耦合特性影响研究

doi: 10.11884/HPLPB202133.200336
基金项目: 国防预研项目(30105140302)
详细信息
    作者简介:

    曾美玲(1996—),女,硕士研究生,从事电子系统电磁环境适应性评估研究;1594402023@qq.com

    通讯作者:

    蔡金良(1987—),女,博士,助理研究员,主要从事电子系统电磁环境适应性评估研究;llttkl@163.com

    秦 风(1985—),男,博士,副研究员,主要从事电磁环境效应及防护技术研究;fq_soul2000@163.com

  • 中图分类号: O441.4

Effect of aperture on shielding performance of metal cavity under excitation of high-intensity electromagnetic pulse

  • 摘要: 核电磁脉冲和高功率微波等强电磁脉冲易造成电子设备功能失效甚至损毁,在实际工程实施中用金属腔体对电子设备进行屏蔽是常用的强电磁脉冲抑制手段。基于电磁仿真计算,对含矩形孔缝金属腔体的强电磁脉冲耦合特性进行了系统研究,阐述了孔缝宽长比、腔体尺寸等因素对多种不同类型强电磁脉冲(核电磁脉冲、宽带高功率微波、窄带高功率微波)作用下腔体内耦合场的影响;并以此为基础,重点分析了强电磁脉冲与含孔缝金属腔体之间的作用机制。研究结果表明:不同类型强电磁脉冲耦合信号差异明显,金属腔体对强电磁脉冲的响应是腔体谐振模式、孔缝谐振频率与强电磁脉冲共同作用的结果;当腔体谐振模式、孔缝谐振频率在强电磁脉冲的带内时,腔体内部的耦合场会出现增强效应;特别地,腔体与孔缝间的相互作用还可造成腔体与缝隙的谐振频率发生偏移。因此,在为电子设备设计金属屏蔽外壳时,应基于不同强电磁脉冲的频带范围,对腔体与孔缝的尺寸进行综合设计,抑制腔体、孔缝谐振及谐振频率偏移,提升其强电磁脉冲防护性能。
  • 图  1  典型的强电磁脉冲波形与频谱分布

    Figure  1.  Typical high-intensity electromagnetic pulses and their corresponding spectral distributions

    图  2  电磁仿真模型

    Figure  2.  Simulation model

    图  3  三种强电磁脉冲辐照下典型腔体中心位置场强波形与频谱

    Figure  3.  Electric field and the corresponding spectral characteristics at the central position of metallic cavity

    图  4  具有不同宽长比孔缝金属腔体强电磁脉冲耦合场波形

    Figure  4.  Couplingelectric field of metallic cavity with different W/L under the excitation high-intensity electromagnetic pulse

    图  5  孔缝宽长比对金属腔体强电磁脉冲耦合场峰值影响

    Figure  5.  Evolution of peak value of the coupling electric field with W/L of metallic cavity under the excitation of high-intensity electromagnetic pulse

    图  6  腔体尺寸对场强峰值的影响

    Figure  6.  Influence of cavity size on the peak value of coupling electric field

    图  7  理想孔缝仿真模型

    Figure  7.  Simulation model of a slot

    图  8  不同尺寸腔体在核电磁脉冲作用下场强频谱随孔缝宽长比的变化

    Figure  8.  Electric field and the corresponding spectral characteristics at the central position of metallic cavity under the excitation of HEMP

    图  9  不同尺寸腔体在宽带高功率微波作用下场强频谱随孔缝宽长比的变化

    Figure  9.  Electric field and the corresponding spectral characteristics at the central position of metallic cavityunder the excitation of WB-HPM

    图  10  不同尺寸腔体在窄带高功率微波作用下场强频谱随孔缝宽长比的变化

    Figure  10.  Electric field and the corresponding spectral characteristics at the central position of metallic cavity under the excitation of NB-HPM

    图  11  孔缝宽长比对金属腔体强电磁脉冲屏蔽效能影响

    Figure  11.  Evolution of the shielding effectiveness of metallic cavity with W/L under the excitation of high-intensity electromagnetic pulse

    表  1  典型金属腔体强电磁脉冲耦合性能

    Table  1.   Electromagnetic coupling of metallic cavity to different high-intensity electromagnetic pulses

    electromagnetic pulsepeak value of electromagnetic field/(kV·m−1time domain shielding effectiveness/dB
    HEMP3.223.9
    WB-HPM47.80.4
    NB-HPM22.86.8
    下载: 导出CSV

    表  2  具有不同宽长比孔缝的金属腔体

    Table  2.   Metallic cavity having aperture with different W/L

    No.W/cmL/cmW/LNotes
    1230~0.07polarization direction is identical to the aperture direction
    287.51.07near to a square aperture
    32036.67polarization direction is orthogonal to the aperture direction
    下载: 导出CSV

    表  3  孔缝最小谐振频率

    Table  3.   Minimum resonant frequency of aperture

    No.W/cmL/cmW/Lestimated fmin/MHzsimulation fmin/MHz
    1230~0.07500449
    22.821.40.13700606
    33.218.750.17800680
    44150.271000832
    54.413.60.321103911
    66100.615001198
    787.51.0720001654
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-12-14
  • 修回日期:  2021-03-09
  • 网络出版日期:  2021-03-24

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