Accuracy of antenna pattern measurement

Near-field methods are now widely used for measuring antenna patterns. Such systems are becoming increasingly affordable, and many current and prospective users are product developers rather than antenna measurement experts. We compare the results of two world-leading and very differently configured systems, the Satimo SG-64 and NSI-200V-5×5. Each has its own requirements, advantages and disadvantages, and we do not comment on these, or on the absolute accuracy of either system. The goal is to compare the results from these systems to get a feel for the expected accuracy with state-of-the-art equipment. To make this comparison, two standard calibration horn antennas have been used, the NSI SG-75 and Satimo SH2000.