为分析开孔金属腔体的场强增强效应，以正方形金属腔体为受试对象，基于数值计算软件CST建立开孔金属腔体场强增强效应计算模型，分析开孔形状、开孔尺寸、入射波极化方向等不同参数对孔缝中心及腔体中心场强增强效应的作用规律。提出使用GTEM小室进行开孔腔体电磁耦合测试新方法，搭建实验平台，验证数值计算结果的正确性，阐释场强增强效应耦合机理。结果表明：当面积相同时，和正方形、圆形孔缝相比，长方形孔缝的场强增强效应显著，长方形孔缝的长宽比越高，场强增强效应便越大；长方形孔缝的增强效应与垂直于孔缝长边的电场分量呈正比；腔体壁厚是影响场强增强效应的关键因素之一；在孔缝中心沿中轴线附近，时域场强峰值呈指数衰减；孔缝中心和腔体中心的场强增强效应耦合机理不相同。%In order to study the enhancement effect of electromagnetic field in the metal cavity with slot, a square cavity is selected in this paper as the test object. The corresponding coupling model of electromag⁃netic enhancement effect is established with the numerical calculation software CST, where the relation⁃ships among the slot shape, slot size, electric field direction, and the enhancement effect at slot center and cavity center are analyzed. Moreover, a new experimental platform based on GTEM chamber is developed so that the numerical results are validated, and the coupling mechanism is verified. The results indicate that when the slot area is fixed, the rectangle slot, compared with square and circular ones, has more re⁃markable enhancement effects. Furthermore, the bigger the ratio of length to width, the stronger the effect, which is decided by the electric field component perpendicular to the long side of slot. Also, the thickness of cavity wall is an important factor to the enhancement effect, and the peak value of electric field around the slot displays exponential attenuation. Finally, the coupling mechanism of slot centers is different to that at the cavity center.
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