Measuring 4×4 MIMO capability in reverberation chambers

We utilize two reverberation chambers (RC) to characterize two four-port antennas. The RC set-ups contain four mounted fixed antennas. This configuration allows to sequentially measure the full 4×4 MIMO capacity of the AUT with only a two port VNA without any alterations of the configuration inside the chamber between measurements. The results show that an RC is a powerful tool to characterize complex multi-element antennas that can easily be extended with more ports when this is required. The two RCs main difference is in the size, with a large chamber designed to fit large test objects and a smaller model designed for mobile devices. We show that there is high repeatability between measurements in the different chambers, indicating the stability of the RC technique.