Antenna Pattern Reconstruction in the Single-Cut Near-Field Multiprobe Setup Based on Power-Only Measurements

Field transformation is an established near-field (NF) antenna measurement solution to reconstruct far-field (FF) antenna patterns with high accuracy and hence has been widely adopted. However, it suffers from long measurement time due to the requirement of collecting massive amounts of complex NF data over a closed sphere. The single-cut concept, which can reconstruct the key information of the device under test (DUT) based on the NF data measured on a specific cut, has been introduced to improve the efficiency. This paper proposes a power-only single-cut algorithm based on the spherical wave expansion (SWE), eliminating the requirement of phase measurement. The focus of our work is to determine the key parameters of the single-cut NF multi-probe setup based on power-only measurements, i.e., the measurement distances, the probe angular spacing, and the probe angular range. The proposed algorithm along with the cost-effective multi-probe setup is validated through numerical simulations and experimental measurements, providing a highly efficient antenna testing solution for 5G and future antenna systems.