研究目的
Investigating the application of nonconvex optimization in phaseless near-field far-field transformations (NFFFT) for electrically large problems, utilizing specialized probes to incorporate partial phase differences.
研究成果
The study demonstrated that a phaseless NFFFT based on nonconvex optimization and utilizing specialized probes can effectively handle electrically large problems, achieving satisfactory transformation accuracy. The use of specialized probes was shown to be crucial for improving far-field results in phaseless transformations.
研究不足
The accuracy of the measurement setup was limited by inaccuracies related to the alignment and positioning of the patch antennas, as well as uncertainties in their radiation characteristic. Additionally, the high computational complexity of some algorithms limited investigations to small sized problems.
1：Experimental Design and Method Selection:
The study employs a nonconvex optimization approach for phaseless NFFFT, utilizing efficient forward and adjoint operators from FIAFTA and the L-BFGS method for optimization.
2：Sample Selection and Data Sources:
Measurements were performed on a DRH400 dual-ridged horn antenna and simulated data from a real-world reflector antenna.
3：List of Experimental Equipment and Materials:
A two-element patch antenna array was used as a probe antenna, and equivalent electric and magnetic current densities were modeled for the inverse problem.
4：Experimental Procedures and Operational Workflow:
Near-field measurements were taken at specific distances and locations, with transformations performed using the proposed nonconvex method.
5：Data Analysis Methods:
The far-field radiation characteristics were analyzed, comparing results from phaseless transformations with and without specialized probes.
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