Proximity-effect test for lossy wireless-device measurements in reverberation chambers

The authors present a test method for quantifying and reducing systematic errors arising from antenna proximity to lossy objects in over-the-air performance testing of lossy large-form-factor wireless devices. The method determines the extent to which antenna proximity to lossy, large-form-factor objects influences the measured reference power transfer function. The test may be used to pre-characterise a given chamber set-up in terms of a minimum distance between antennas and lossy objects. They illustrate the use of the method in a total radiated power measurement of a large, commercially available, machine-to-machine device, where agreement to anechoic-chamber measurements is demonstrated to within the measurement uncertainty.