Evaluation of field anisotropy coefficient in reverberation chamber and research on its optimal measurement method
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摘要: 混响室的场各向异性系数定量评估了混响室性能且可用于混响室间的比较，对于混响室性能评估具有重要作用。首先对混响室场各向异性系数理论分布情况进行了介绍，明确理想情况下二维场各向异性系数应为0，三维场各向异性系数应为
0.5547 ；然后基于三维电场探头按标准对混响室场各向异性系数进行了评估，各频点二维场各向异性系数处于[−0.1, 0.1]之间，三维场各向异性系数处于[0.5254 ,0.5589 ]之间，整体小于−15 dB，按标准该混响室具有“良好的”性能；最后针对测试流程繁复的问题提出了基于混响室散射参数的场各向异性系数优化测试方法，所需测试次数成倍减少，试验结果显示除个别频点外整体场各向异性系数小于−15 dB，与原方法基本相同，为混响室性能评估提供了重要工程实践指导经验。Abstract:Background The reverberation chamber (RC) is widely used for electromagnetic compatibility testing. The field anisotropy coefficient is a key parameter for quantitatively evaluating its performance and enabling comparisons between different chambers, playing a critical role in assessing RC quality.Purpose This study aims to evaluate the field anisotropy coefficient of a reverberation chamber according to standard methods, verify its performance level, and propose an optimized testing approach to reduce the complexity and time required for measurement while maintaining accuracy.Methods First, the theoretical distribution of the field anisotropy coefficient was reviewed, indicating ideal values of 0 for 2D and0.5547 for 3D. Measurements were then carried out using a three-axis electric field probe following standard procedures. To streamline the process, an optimized method based on scattering parameters was introduced, significantly reducing the number of required measurements.Results The standard measurement results showed that the 2D field anisotropy coefficient fell within [−0.1, 0.1], and the 3D coefficient was between [0.5254 ,0.5589 ]. Overall, the values were below −15 dB, indicating “good” performance of the chamber according to the standard. The proposed optimized method produced consistent results, with field anisotropy coefficients largely remaining below −15 dB except for a few frequency points.Conclusions The reverberation chamber under test demonstrates good performance. The proposed scattering parameter-based method greatly reduces test time and complexity while yielding results consistent with those of the standard approach. This offers valuable practical guidance for efficient and accurate reverberation chamber evaluation. -
图 5 混响室试验布置及其等效模型
Figure 5. Reverberation chamber test configuration and its equivalent model
表 1 测试结果
Table 1. Results of experiments
$ \left\langle {A_{xy}} \right\rangle $ $ \left\langle {A_{y{\textit{z}}}} \right\rangle $ $ \left\langle {A_{{\textit{z}}x}} \right\rangle $ $ \left\langle {A_{{\rm{tot}}}} \right\rangle $ max 0.0715 (−11.46 dB)0.0547 (−12.62 dB)0.1000 (−10.00 dB)0.5589 (−23.77 dB)min − 0.0624 (−12.05 dB)−0.069 (−11.61 dB) − 0.1236 (−9.08 dB)0.5254 (−15.33 dB)
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表 2 测试结果
Table 2. Results of experiments
$\left\langle {A_{xy}} \right\rangle $ $\left\langle {A_{y{\textit{z}}}} \right\rangle $ $\left\langle {A_{{\textit{z}}x}} \right\rangle $ $\left\langle {A_{{\rm{tot}}}} \right\rangle $ max 0.1636 (−7.86dB)0.1302 (−8.85dB)0.1067 (−9.72dB)0.5666 (−19.24dB)min − 0.1065 (−9.73dB)− 0.1326 (−8.77dB)− 0.1065 (−9.73dB)0.5116 (−13.66dB)
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