Single-Cut Near-Field Far-Field Transformation Technique Based on 2D Plane-Wave Expansion

A single-cut near-field far-field transformation technique is presented. It predicts two-dimensional (2D) far-field (FF) from measured near-field (NF) on the same cut-plane, without any constraints about NF measurement location and probe. The proposed technique is based on 2D plane-wave expansion which is conventionally used for 2D fast multipole method (2D-FMM). The plane-wave expansion is performed for the Green's function approximated under the assumption that the dimension of the antenna under test (AUT) and the probe is negligible in the direction vertical to the measurement cut-plane. The proposed transformation method is validated experimentally.