Wideband Validation of a Phase Retrieval Process Applied to Infrared Planar Near-Field Measurements

Abstract

Abstract-The framework of our work is the application of a fast method to estimate the radiation pattern of an antenna from the measurement of the electric-field magnitude in the near-field region using infrared (IR) camera. IR acquisition techniques allows quasirealtime measurements of the magnitude of the electrical field on planar surfaces in near-field conditions. However the antennas radiation patterns can only be estimated from near-field electrical magnitude and phase measurements. Consequently a classical plane to plane iterative phase retrieval process has been developed and tested with respect to a large number of configuration parameters such as to find an optimal configuration on a wide frequency range . In order to achieve and validate such a study, some comparisons have been performed on data obtained either by numerical simulation or classical near-field technique based upon radio-frequency (RF) probe scanning on simple horn antennas. Among all the studied parameters we will focus onto the influence of the dynamic range of the measurements on the reconstructed radiation patterns and on validations from experimental results.

Performance Evaluation of Phase-Angle Gradient Method for Phase Retrieval Based on Low-Frequency Amplitude-Only Near-Field Data

“…Recent efforts have also been contributed to millimeter-wave imaging applications in which the phase information of the scattered field is retrieved based on amplitudeonly measurements [7]. In [8] a phase retrieval method applied to infrared near-field measurements is discussed.…”

Near-fields: Numerical modeling and experimental validation in embedded electronic systems

“…This relation is not that simple and for each type of device and situation, a sensibility test must be carried out. Some authors suggest different techniques like Modulated Scattered Approach [2] or IR Mapping [3][4][5] among others.…”

Nufft-Accelerated Plane-Polar (Also Phaseless) Near-Field/Far-Field Transformation

“…However, for the sake of simplicity, they will be kept the same in the following and indicated by the symbol D in both the cases. Furthermore, although the NUFFT technique can be applied to different kinds of phaseless approaches [21,24,25], in this paper we refer to the one in [21] which has been shown more effective than that in [24]. Nevertheless, the proposed calculation procedure applies also to the so-called "plane-toplane" approach.…”