Determination of the “quasi-ideal reverberation chamber minimum frequency” according to the mode stirrer geometry

An original method allowing to define from measurements a specific frequency called “Quasi-Ideal Reverberation Chamber Minimum Frequency” (QIRCMF) is presented. This frequency corresponds to the frequency where a mode stirred reverberation chamber starts to work “quasi-ideally”. 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 by Hill [1]) and 2) the number of uncorrelated samples obtained over one mode stirrer revolution. Experimental results clearly show that the QIRCMF is reduced by increasing the mode stirrer geometry in particular when the reverberation chamber works at its optimal Q-factor. Original results corresponding to the influence of the mode stirrer geometry on the EM field distributions obtained in the working volume for different Q-factors of the facility are also presented.