How Does RFxpert Work to Make Antenna Measurements Under a Second? - Hardware Explained

How does RFxpert work? How can RFxpert make antenna performance measurements in less than a second?  This video talks about the hardware inside the RFxpert RFX and explain how it can make antenna measurements under a second.

Model: RFxpert RFX

AUT: The device tested is the MIMO tool which has 4 printed patch antennas on the back side. These patches are linearly polarized E-shaped with a PIFA type structure. They are organized in a rectangular grid.