Antenna arrays for testing wireless devices

A system for testing wireless devices, the system comprising:

• a radio frequency (RF) shielded chamber;
• an antenna array mounted on a first interior surface of the RF shielded chamber, the antenna array comprising a plurality of groups of antenna elements and a plurality of power combiners, wherein each group of antenna elements is matched to a matching group of antenna elements by virtue of being coupled to a respective power combiner for both the group and the matching group;
• and
• an antenna interface circuit coupled to the antenna array and configured to receive or transmit at least a first test signal having a first wavelength from or to a device under test (DUT) supported by a second interior surface of the RF shielded chamber opposite the first interior surface;
• wherein the antenna elements are spaced apart so that each antenna element is spaced apart from every other antenna element by at least half of the first wavelength of the first test signal;
• and
• wherein the antenna elements are spaced apart in a rectangular grid having four quadrants, and wherein, for each group and matching group of antenna elements, the antenna elements of the group and the matching group are mirrored on opposite quadrants of the rectangular grid.