Effects of the Unstirred Power on the Three-Antenna Efficiency Measurements in a Reverberation Chamber

The reverberation chamber (RC) has been widely applied to antenna efficiency measurements. The RC-based three-antenna method can determine the antenna efficiency without the need of a reference antenna or assuming constant enhanced backscatter coefficient. Thus, it is more convenient in practice. In this letter, an average Rician K-factor-based uncertainty model for the three-antenna method is proposed. The newly proposed model considers the number of independent samples and the nonideality of the RC simultaneously. Extensive measurements are conducted under different RC configurations. It is shown that the proposed model can provide accurate and stable uncertainty estimations regardless of the RC’s loading condition. The findings of this letter allow rigorous uncertainty analyses of three-antenna efficiency measurements in the RC.