Design and performance evaluation of boundary deformation reverberation chamber
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摘要: 使用微扰理论分析了腔体形变对谐振频率漂移的影响规律，从理论上论证了边界形变混响室的可行性，计算得到了边界形变参数对混响室空间电场均匀性的影响规律；采用了一种由柔性屏蔽布作为腔体材料、步进电机控制腔体表面形变的边界形变混响室设计方法，并对研制的几何尺寸为2.5 m×1.8 m×1.5 m的混响室的内部电场统计特性进行了试验测试。结果表明：混响室内部电场服从Rician分布，且随频率升高与理论模型的一致性变好；当形变幅度达到400 mm时，腔体内部电场扰动比大于20 dB，空间电场标准偏差小于3 dB，满足电磁兼容对混响室平台均匀性的限制要求。Abstract: The perturbation theory was used to analyze the influence of cavity deformation on the resonance frequency drift, and the feasibility of the boundary deformation reverberation chamber was demonstrated theoretically. The influence of the boundary deformation parameters on the uniformity of the electric field in the space of the reverberation chamber was obtained by calculation. A design method of boundary deformation reverberation chamber with flexible shielding cloth as the cavity material and stepping motor controlling the surface deformation of the cavity was proposed. The statistical characteristics of the electric field were tested experimentally. And the results show that the electric field inside the reverberation chamber obeys the Rician distribution, and the consistency with the theoretical model becomes better as the frequency increases; when the deformation amplitude reaches 400 mm, the internal electric field perturbation ratio of the cavity was greater than 20 dB. The standard deviation of the electric field was less than 3 dB, which meets the limit requirements of electromagnetic compatibility on the uniformity of the platform.
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图 1 边界形变数量对混响室空间电场统计均匀性的影响
Figure 1. Influence of the amount of boundary deformation on the statistical uniformity of the spatial electric field in the reverberation chamber
图 2 形变幅度对混响室空间电场统计均匀性的影响
Figure 2. Influence of deformation amplitude on the statistical uniformity of the spatial electric field in the reverberation chamber
图 6 混响室内电场概率分布函数
Figure 6. Probability distribution function of electric field in the reverberation chamber
图 7 混响室内部空间电场统计均匀性
Figure 7. Statistical uniformity of the spatial electric field inside the reverberation chamber
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