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Scaling Factor for Turn-Table Platform Stirring in Reverberation Chamber

The turn-table platform stirring technique has been used to improve the measurement accuracy of a reverberation chamber (RC), where half-wavelength spatial sampling on the platform is usually used as a rule of thumb. A smaller sampling distance (scaling factor) was suggested experimentally by curve fitting in a previous work. However, an analytical study of this scaling factor is still missing in the literature. By expanding the electromagnetic plane wave using the Jacobi–Anger expansion, the scaling factor is determined when the truncation error falls below certain threshold. The result is verified by measurements in a RC.