Effect of size, orientation, and eccentricity of mode stirrers on their performance in reverberation chambers

We analyze the effect of the dimensions, aspect ratio, orientation, and eccentricity of rotation of a rectangular surface element on its performance as a mechanical mode stirrer in a reverberation chamber. Stirring performance is quantified by the number of coherence cells traversed by this surface during the stirring process. Concentrically as well as eccentrically rotating elements are investigated. The dependence of stirring sensitivity coefficients on the width-to-wavelength ratio and the aspect ratio is different for both cases. The radius of the orbit and the orientation of the surface element relative to the orbit are found to have a major influence.