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为分析金属腔体场强增强效应,保护腔体内部敏感电路,采用电磁仿真软件CST,从频域角度利用屏蔽效能对其开展仿真研究,并利用矢量网络分析仪、功率放大器、GHz横电磁波传输室和脉冲强磁场测量探头搭建实验系统进行了验证。最后理论分析了场强增强效应的形成机理,研究了孔缝形状、电磁波极化方向、腔体不同位置、吸波材料加载对场强增强效应的影响规律。仿真和实验结果有较好的一致性,结果表明:腔体孔缝增强效应受到腔体表面电流、孔缝谐振和腔体谐振的影响;矩形孔缝的场强增强效应比方形、圆形孔缝显著;电磁波极化方向垂直于矩形孔缝长边的场强增强效应最强;在最小谐振频率以下,孔缝中心轴线上离孔缝越近增强效应越显著,并且加入吸波材料能较好地减弱腔体中心的场强增强效应。研究结果为含孔缝腔体的电磁兼容设计与防护提供了理论依据。
In order to analyze the enhancement effect of metal cavity field strength and to protect the sensitive circuits inside the cavity, the electromagnetic field simulation software CST was used to simulate the effect of metal field strength by using the shielding effectiveness. The vector network analyzer, power amplifier and GHz transverse electromagnetic wave transmission Room and pulsed magnetic field measurement probe to build the experimental system was verified. Finally, the formation mechanism of the field enhancement effect is analyzed theoretically. The influence of aperture shape, polarization direction of electromagnetic wave, different position of cavity, and the effect of absorbing material on field enhancement is studied. The results show that the enhancement effect of the cavity aperture is affected by the surface current, the cavity aperture resonance and the cavity resonance. The enhancement effect of the square aperture is stronger than that of the square and circular holes The effect of enhancement of the field strength perpendicular to the long side of the rectangular hole slit is the strongest. Under the minimum resonance frequency, the closer the center axis of the hole to the hole slit, the more significant the enhancement effect, and the addition of the absorbing material can compare Good to reduce the center of the cavity field strength enhancement effect. The results provide a theoretical basis for the design and protection of electromagnetic compatibility of cavities with holes.