The Effect of Two Stirrers in a Large Reverberation Chamber

The significant characteristics of the electromagnetic environment in an ideal reverberation chamber are uniformity, isotropy and random polarization. Stirrer performance in a reverberation chamber is crucial to these characteristics. In this paper, based on the statistical theory, the uncertainty due to the number of independent samples is given. The key mechanism that causes the fields in a reverberation chamber to become uniformly random by rotation of stirrers, and the advantages of using two stirrers over one stirrer are analysed. The E-fields inside a large reverberation chamber with two stirrers and with one stirrer respectively are simulated using the Finite-Difference Time-Domain (FDTD) technique. By comparing the effects of two stirrers with that of one stirrer on the uniformity and number of independent samples, it is found that two stirrers produce a better performance in a large reverberation chamber than one stirrer with a relatively larger size.