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Reverberation chambers are currently used to test electromagneticcompatibility as well as to characterize antenna efficiency, wireless devices,and MIMO systems. The related measurements are based on statistical averagesand their fluctuations. We introduce a very efficient mode stirring processbased on electronically reconfigurable metasurfaces (ERMs). By locally changingthe field boundary conditions, the ERMs allow to generate a humongous number ofuncorrelated field realizations even within small reverberation chambers. Wefully experimentally characterize this stirring process by determining theseuncorrelated realizations via the autocorrelation function of thetransmissions. The IEC-standard uniformity criterion parameter $\sigma_{dB}$ isalso investigated and reveals the performance of this stirring. The effect ofshort paths on the two presented quantities is identified. We compare theexperimental results on the uniformity criterion parameter with a correspondingmodel based on random matrix theory and find a good agreement, where the onlyparameter, the modal overlap, is extracted by the quality factor.

Uncorrelated Configurations and Field Uniformity in Reverberation Chambers Stirred by Tunable Metasurfaces