Comparison of the results of restoring the radiation pattern of a conical horn antenna in the far zone based on measurements in the Fresnel zone at different positions of the antenna aperture center relative to the center of rotation

Currently, antenna parameter measurement methods can be divided into two main groups: far-range and near-range methods. Long-range methods do not require expensive and complex equipment, but their implementation often requires an antenna range hundreds and thousands of meters long. In addition, the task of shielding the measuring path from the influence of signal reflections from various objects becomes almost impossible. Near-field methods, on the contrary, are devoid of this disadvantage, but require the use of complex automated measurement and computing systems. The method of measuring antenna characteristics in the Fresnel zone makes it possible to organize an antenna range of significantly shorter length than in the methods of the far zone. This article is devoted to the use of this method in relation to a conical horn antenna at a frequency of 13 gigaherz (GHz). The effect of correction of phase direction pattern is shown for different values of the size of the direction pattern recovery area, as well as for different configurations of the antenna position on the control unit. The direction pattern recovery results was analyzed for each control unit configuration. Based on the analysis of the results of the direction pattern restoration results, a conclusion was made about the relationship between the need to correct the phase direction pattern and the distance from the center of the antenna aperture to the intersection of the axes of rotation of the control unit.