Measurement Verification of Plane Wave Synthesis Technique Based on Multi-probe MIMO-OTA Setup

Standardization work for MIMO OTA testing methodsis currently ongoing, where a multi-probe anechoic chamberbased solution is an important candidate. In this paper, theprobes located on an OTA ring are used to synthesize a planewave field in the center of the OTA ring. This paper investigatesthe extent to which we can approach the synthesized plane wavein practical measurement systems. Both single plane wave withcertain AoA and multiple plane waves with different AoAs andpower weightings are synthesized and measured. Deviations ofthe measured plane wave and the simulated plane wave field arepresented in terms of phase and power. Possible reasons for thedeviations are also investigated