International audienceAn original method allowing to define a particular frequency called “quasi-ideal reverberation chamber (RC) minimum frequency” is presented. This frequency corresponds to the frequency where an RC is considered as working in a “quasi-ideal regime.” According to the definition of an ideal RC, the method is based on the assessment 1) of the electromagnetic (EM) field distributions obtained in the working volume (in comparison with the distributions obtained in the ideal model defined by Hill [D. A. Hill, “Plane wave integral representation for fields in reverberation chambers,” IEEE Trans. Electromagn. Compat., vol. 40, no. 3, pp. 209--217, Aug. 1998.]) and 2) of the number of uncorrelated samples obtained over one mode stirrer revolution. The method is considered as helpful in order to optimize the functioning of an RC at low frequencies for broadband EM compatibility immunity and emission tests. Indeed, it is shown from experimental and numerical results that the insertion of an optimal loading in the chamber allows to decrease the frequency where the chamber works quasi-ideally. The influence of complexifying the mode stirrer geometry is also discussed

In this paper, a method for extracting and quantifying the weight of cavity modes within a reverberation chamber (RC) in the presence of different stirrers is presented from simulations performed with the FEKO software. The presented results clearly show the relationship between the efficiency of stirring and the stirred volume.

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An original method allowing to define from measurements a specific frequency called "Quasi-Ideal Reverberation Chamber Minimal Frequency" (QIRCMF) is presented. The QIRCMF corresponds to the frequency where a mode stirred reverberation chamber is considered as working in a "quasi-ideal regime". After a definition of what means "quasiideal" reverberation chamber, the method is presented. The method is based on 1) the assessment of the electromagnetic field distributions obtained in the working volume (in comparison with the distributions obtained in the ideal model defined in [1]) and 2) the assessment of the correlation of the electromagnetic field over one mode stirrer revolution. Experimental results clearly show that the QIRCMF can be highly reduced by introducing in the mode stirred reverberation chamber but far from the working volume a little amount of loading.