To evaluate the performance of oscillating wall stirrer (OWS) in reverberation chamber (RC), the number of independent stirrer positions, and field distributions (in lessmoded, undermoded, and overmoded frequency regimes) are discussed in detail in this work. For the estimation of independent stirrer positions, correlation matrix method (CMM), i.e., threshold-dependent correlation matrix defined by Pearson correlation coefficient, is used to determine the number of independent stirrer positions, where experimental comparative analysis between autocorrelation coefficient in IEC 61000-4-21 and CMM is presented, and the corresponding results provide a reasonable explanation for the overestimation of independent stirrer positions. For the field distributions, parameter $M$ in Bessel $K$ distribution, related to the number of excited modes within $Q$-bandwidth, is adopted to assess the quasiwall-like behavior of OWS in lessmoded, undermoded, and overmoded RCs, respectively, and the results show that OWS can distribute the field energy that was not sufficiently stirred with a higher probability ($>$50%) at undermoded frequencies.

中文翻译：

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使用相关矩阵法和$Q$-带宽内的模式评估混响室中的振荡壁搅拌器的性能

为了评估混响室 (RC) 中振荡壁式搅拌器 (OWS) 的性能，本文详细讨论了独立搅拌器位置的数量和场分布（在较少调制、欠调制和过调制频率范围内）。对于独立搅拌器位置的估计，相关矩阵法（CMM），即由Pearson相关系数定义的阈值相关相关矩阵，用于确定独立搅拌器位置的数量，其中IEC 61000中自相关系数之间的实验比较分析- 4-21 和 CMM 给出，相应的结果为独立搅拌器位置的高估提供了合理的解释。对于场分布，参数百万美元 （贝塞尔） $K$ 分布，与内部激发模式的数量有关 $Q$带宽，分别用于评估 OWS 在少模、欠模和超模 RC 中的类壁行为，结果表明 OWS 可以以更高的概率分配未充分搅拌的场能（$>$50%) 在欠模频率下。