Analysis of field distribution characteristics of controllable boundary deformation reverberation chamber
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摘要: 分析了边界形变对混响室谐振频率漂移的影响，并提供了一种边界形变可控的混响室反射面设计。将传统机械搅拌器改变为褶皱墙面，通过控制相邻反射模块的夹角，达到改变边界条件的目的。构建了5 m×4 m×3 m混响室腔体仿真模型，从场均匀性、搅拌效率和场分布规律三个方面分析了边界形变可控混响室的有效性，结果表明测试区域电场标准偏差低于3 dB，搅拌效率高于传统机械搅拌器，测试区域电场服从理想混响室分布规律，该方法可有效增加混响室测试区域空间。Abstract: The influence of boundary deformation on the resonant frequency drift of a reverberation chamber was analyzed, and a design of a reverberation chamber reflector with controllable boundary deformation was proposed. Transforming the traditional mechanical stirrer into a wrinkled wall, the goal is to change the boundary conditions by controlling the angle between adjacent reflection modules. A simulation model of a 5 m×4 m×3 m reverberation chamber was constructed, and the effectiveness of the controllable boundary deformation reverberation chamber was analyzed from three aspects: field uniformity, stirring efficiency, and field distribution. The results show that the standard deviation of the electric field in the test area was less than 3 dB, the stirring efficiency was higher than that of traditional mechanical mixers, and the electric field in the test area followed the ideal distribution pattern of the reverberation chamber. This method can effectively increase the testing area space of the reverberation chamber.
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图 1 边界形变可控混响室反射面设计流程图
Figure 1. Flowchart for the design of reflective surfaces in a controllable boundary deformation reverberation chamber
图 2 常规混响室内壁反射面结构示意图
Figure 2. Schematic diagram of the reflective surface structure on the inner wall of a conventional reverberation chamber
图 3 边界形变可控的混响室内壁反射面结构示意图
Figure 3. Schematic diagram of the reflective surface structure on the inner wall of a controllable boundary deformation reverberation chamber
图 4 机械搅拌混响室和边界形变混响室的独立搅拌位置数量对比
Figure 4. Comparison of the number of independent stirring positions between mechanically stirred reverberation chamber and boundary-deformation-based reverberation chamber
图 5 电场各分量及总电场的频域标准偏差
Figure 5. Frequency domain standard deviation of each component of the electric field and the total electric field
图 6 电场分量实部虚部的概率密度函数
Figure 6. Probability density function of the real and imaginary parts of electric field components
图 7 单一方向电场分量的概率密度函数
Figure 7. Probability density function of electric field components in a single direction
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