A high precision holographic phaseless near-field method

A novel holographic near-field phaseless method is presented. The measurement system is composed of the amplitude scanning measurement system, the holographic reconstructed algorithm, the antenna under test (AUT) and the reference antenna. The interference amplitude of the AUT with the reference antenna is measured by the amplitude scanning system. The complex near field of the antenna under test is reconstructed by computer, where the measured interference field is corrected by the multiplication with the virtual spherical reference wave and then filtered in Fourier Transformation domain (e.g. Plane Wave Angular Spectrum) or the back-projected image space. The reconstruction method is rigorous without traditional Fresnel Approximation. The novel holographic phaseless measurement method can be used in many applications as for planar near field measurements for example. Measured and simulated results are presented to demonstrate the complex field retrieval method.