Single-Cut Phaseless Near-Field to Far-Field Transformation

This paper introduces a fast single-cut near-field to far-field transformation method using amplitude-only data. By measuring the antenna near-field amplitude on two concentric rings, the complex far-field for the corresponding ring plane can be retrieved. This avoids the full spherical scanning of traditional near-field measurements if one is interested in only a few radiation pattern cuts. In addition, the phase retrieval algorithm benefits from the reduced dimensionality of the problem. Because the number of unknowns have been reduced to a single ring, the performance is improved with respect to standard full spherical phaseless approaches. The proposed single-cut phaseless technique is tested using simulated and measured data, showing its potential for fast and more reliable amplitude-only measurements.