On the Cancellation of Unstirred Paths in a Fully Stirred VIRC Working as a Perfect Chaotic Reverberation Chamber

This communication presents the performance of a vibrating intrinsic reverberation chamber (VIRC) prototype, which is proven to cancel the presence of unstirred paths inside. To do so, the chamber made of metallized textile is suspended above the ground. Therefore, each point of the canvas can move under the effect of the stirring process. To highlight this fundamental result, we have introduced an original metric called the “minimum achievable
$K$
-factor” derived from the
$K$
-factor, the one which assesses the ratio between the stirred and the unstirred energy within a reverberation chamber (RC). When comparing with the results obtained in a classic RC, it is shown that the amount of unstirred energy is significantly reduced in our VIRC, which can benefit to numerous RC applications. Moreover, the presence of unstirred paths is shown to be fully canceled above 7 GHz; the
$K$
-factor being similar to the minimum achievable
$K$
-factor. It is, therefore, possible to consider that our prototype works as a perfectly chaotic RC above this frequency.