Statistical characteristics of maximum E-field distribution in a reverberation chamber

A statistically uniform E-field is created in a reverberation chamber by moving mechanical stirrers to vary boundary conditions. The uniformity of the spatial E-field distribution in an ideal reverberation chamber can be theoretically estimated using the probability density function of its distribution. However, uniformity in a real chamber is affected by the dimensions of the chamber and the structure of the stirrers. We experimentally and theoretically evaluated the effect of stirrers on spatial uniformity. When the dimensions of a chamber equipped with effective stirrers are large compared to the wavelength, that is, when resonant modes above approximately 10⁵ exist below the operating frequency, the spatial uniformity is in good agreement with theoretical values.