A general method for determining the number of independent stirrer positions in reverberation chambers is presented. The method uses a number of measurement positions in a defined test volume to characterize the spatial field distribution. Using the Pearson correlation coefficient the field distributions of the stirrer positions are tested for linear correlation and pairs of independent stirrer positions are determined. From those pairs sets of independent stirrer positions are identified using a simple algorithm as well as a maximum clique algorithm. It is shown that the general method yields detailed information about the number and distribution of the independent stirrer positions and is therefore particularly suitable to evaluate other methods. As a first step the standard method according to IEC 61000-4-21 is compared to the presented method.
Ahstract-A method for estimating the number of indepen dent stirrer positions in reverberation chambers is described in lEe 61000-4-21. This standard method is known to have disadvantages, but is a practical way to estimate the number of independent stirrer positions with comparatively low effort. A general method for determining the number of independent stirrer positions in reverberation chambers was presented in the previous papers. For this method the field distributions are measured for a given number of points within a defined test volume and as a function of stirrer positions. The field distributions of the used stirrer positions are tested for linear correlation using the Pearson correlation coefficient and a certain correlation threshold. In the following paper the evaluation of the general method is continued. Especially the dependency from the number of measurement points and the correlation threshold is investigated. The results are compared to the simulation results obtained by a numerical analysis of the given chamber.
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