The scattering damping time $({{\tau _s}})$ of a reverberation chamber is a very important parameter but hard to obtain accurately. A novel method for extracting this parameter is presented in this article. By utilizing the frequency domain autocorrelation function and the unstirred frequency domain autocorrelation function, ${\tau _s}$ can be directly calculated from measured S-parameters without the need of performing the inverse Fourier transform (IFT). Mathematical derivation is given based on the Wiener–Khinchin theorem, and experimental measurements are conducted for different frequency bands as well as different stirrer configurations to verify the proposed approach. Compared with the conventional IFT-based method, the proposed method does not involve the procedure of manually selecting the fitting range, while still maintains advantages in terms of the independence of the radiation efficiency and input impedance of the measurement antennas.

中文翻译：

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基于自相关函数的混响室散射阻尼时间提取频域方法

散射阻尼时间 $({{\tau _s}})$混响室的参数是一个非常重要的参数，但很难准确获得。本文介绍了一种提取此参数的新方法。通过利用频域自相关函数和未搅拌的频域自相关函数，${\tau _s}$可以从测量的 S 参数直接计算，无需执行逆傅立叶变换 (IFT)。基于 Wiener-Khinchin 定理给出了数学推导，并针对不同的频带以及不同的搅拌器配置进行了实验测量，以验证所提出的方法。与传统的基于IFT的方法相比，所提出的方法不涉及手动选择拟合范围的过程，同时在测量天线的辐射效率和输入阻抗的独立性方面仍然保持优势。