Spherical Near-Field Measurements for Offset-Mounted Antennas

Spherical near-field measurements of offset mounted antennas lead to increased scanning times with respect to a standard centered measurement. Such offset increases the effective electrical dimensions of the antenna under test (AUT) so a higher number of samples is required for the far-field transformation. This paper presents a near-field to far-field transformation technique for offset mounted antennas which avoids the increased measurement times, with improved computational efficiency and full probe correction. Numerical and measurement examples are given to demonstrate its performance in various scenarios.