Determination of the “Quasi-Ideal Reverberation Chamber Minimal Frequency” according to loading

Abstract

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.

Characterization and modeling of measurement uncertainty in a reverberation chamber with a rotating mode stirrer

“…This is because the independent sample number increases with increasing frequency, i.e., the distance between two consecutive stirrer positions keeps the same, whereas the coherence distance decreases with increasing frequency. Another interpretation of these observations is that the lowest usable frequency (LUF) 5 of the RC increases with increasing loading [20].…”

Dependence of reverberation chamber performance on distributed losses: A numerical study

“…Furthermore, the so-called stirrer efficiency depends on the average Q factor value, and the benefit brought by optimized blade geometries can be appreciated not only at the highest RC Q factor [7], [8].…”