频率搅拌嵌套混响室场分布的统计特性

Statistical characteristics of field distribution in nested frequency stirred reverberation chambers

为明确频率搅拌方式下嵌套混响室内的场分布,在混响室电磁统计特性的基础上,对嵌套小室内外的场分布进行了理论研究,重点对小混响室开窗大小对场分布的影响进行了分析。当窗口为电大尺寸时,小混响室内外均服从瑞利分布;为电小尺寸时,参考车-车链路通信的统计特性,小混响室内部应满足双瑞利分布。在某大型混响室内,借助矢量网络分析仪,通过测试收、发天线间的散射参数S21,实现了样本数据的快速采集,并将样本数据与理论分布模型进行了拟合优度检验(KS检验),检验结果证明了假设分布的正确性。

In order to figure out the field distributions inside nested frequency stirred reverberation chamber （RC）, the field distributions in and out of the nested small RC are analyzed on the basis of the electromagnetic statistical theory. The size of the aperture connecting the two reverberation chambers is thought to be a key factor for the field distribution in the nested small RC. When the aperture is big enough for the electromagnetic wavelength, the field distributions should obey Rayleigh distribution; however, when it is very small, the situation will be similar with the vehicle-to-vehicle（V2V） communication, thus the field distribution in the small RC may follow double Rayleigh distribution. In order to examine the hypothesis of the distribution model, the scattering parameters S21 between the transmitting and receiving antenna are measured by a vector network analyzer in a nested RC, and the sample data are examined by the goodness of fit tests （KS tests）. The test results prove the hypothesises, and this is helpful in understanding the test principle, and useful to improve the accuracy of the relevant test and expand the potential applications of frequency stirring nested reverberation chambers.