Biased Estimation of Antenna Radiation Efficiency Within Reverberation Chambers Due to Unstirred Field: Role of Antenna Stirring

Reverberation chambers (RCs) are now a reliable alternative to anechoic (ACs) perform antenna radiation efficiency measurements. Most methods, including the two-antenna one used in this article, based on evaluation of stirred components scattering parameters. They obtained by subtracting average parameters from measured ones. This averaging is performed because mechanical stirring, that is, sometimes supplemented additional stirring such as (which includes platform and source stirring). In we present an extensive study role retrieved efficiency. Four measurement campaigns were successively performed: without with only, combined both antennas. Performing only or leads biased estimation Therefore, showed antennas mandatory obtain unbiased