Research on performance improvement of source stirring reverberation chamber introduced by stationary diffusers

In order to improve the performance of source stirring reverberation chamber (SSRC), we studied the field uniformity of SSRC with stationary diffusers. First, we theoretically analyzed effects of stationary diffusers based on resonance and mode stirring theory, then, from actual measured results, we verified the validity of simulation results obtained by a simulation tool named FEldberechnung bei Korpern mit beliebiger Oberflache (FEKO). Finally, we calculated out the field uniformities of three different kinds of reverberation chamber (RC), i.e. mechanical stirring RC (MSRC), SSRC and SSRC with stationary diffusers. Results show that performance of SSRC is worse than that of MSRC except for a few frequencies, and three sets of stationary diffusers leading to SSRC achieve better uniformity which is close to that of MSRC. It is concluded that stationary diffusers can be used as a valid tool to improve the field uniformity of SSRC, and the combination of mechanical stirring and source stirring is possible to produce a composite stirring RC with better performance.