A near-field calibration arrangement for a phased-array antenna determines the phase shifts or attenuation of the elemental control elements of the array. The calibration system includes a probe located in the near field, and a calibration tone generator. The tone generator is coupled to the probe in...http://www.google.co.uk/patents/US6084545?utm_source=gb-gplus-sharePatent US6084545 - Near-field calibration system for phase-array antennas
