An algorithm for the antenna phase center calculation

A simple algorithm for determining the location of the antenna phase center is presented. The algorithm exploits amplitude and phase measurements, carried out in anechoic chamber, of the electromagnetic field received by the antenna under test. It is based on an accurate model able to account for the possible (unknown) misalignment between the axis of symmetry of the antenna under test and the rotation axis of the rotating column of the anechoic chamber. The proposed method has been applied to calculate the phase center of a microstrip antenna of an airborne synthetic aperture radar system operating at X-band. The presented results clearly show the effectiveness of the proposed algorithm.