TY - GEN
T1 - Near-Field Far-Field Transformations with Unknown Probe Antennas
AU - Paulus, Alexander
AU - Eibert, Thomas F.
N1 - Publisher Copyright:
© 2023 European Association for Antennas and Propagation.
PY - 2023
Y1 - 2023
N2 - The characterization of unknown antennas under test (AUTs) from measurements of the radiated near field (NF) is commonly performed with known probe antennas. By accounting for the behavior of a given probe in the processing of the NF data, the obtained quantities of interest, e.g., the far-field (FF) behavior of the radiator, are free of biases and distortions caused by the probe sensor. We discuss an NF FF transformation (NFFFT) which can fully compensate the effect of the probe, while only requiring knowledge about its electrical size, position, and orientation. An iterative nonconvex technique based on alternating projections is discussed, as well as a convex approach utilizing bilinear forms is provided. Connections to the related problem of phase retrieval are highlighted. Simulation results showcase the validity of NFFFTs with full probe correction of unknown probes and shed some light on potential limitations.
AB - The characterization of unknown antennas under test (AUTs) from measurements of the radiated near field (NF) is commonly performed with known probe antennas. By accounting for the behavior of a given probe in the processing of the NF data, the obtained quantities of interest, e.g., the far-field (FF) behavior of the radiator, are free of biases and distortions caused by the probe sensor. We discuss an NF FF transformation (NFFFT) which can fully compensate the effect of the probe, while only requiring knowledge about its electrical size, position, and orientation. An iterative nonconvex technique based on alternating projections is discussed, as well as a convex approach utilizing bilinear forms is provided. Connections to the related problem of phase retrieval are highlighted. Simulation results showcase the validity of NFFFTs with full probe correction of unknown probes and shed some light on potential limitations.
KW - field transformations
KW - inverse problems
KW - near field
KW - probe correction
UR - http://www.scopus.com/inward/record.url?scp=85162235231&partnerID=8YFLogxK
U2 - 10.23919/EuCAP57121.2023.10133026
DO - 10.23919/EuCAP57121.2023.10133026
M3 - Conference contribution
AN - SCOPUS:85162235231
T3 - 17th European Conference on Antennas and Propagation, EuCAP 2023
BT - 17th European Conference on Antennas and Propagation, EuCAP 2023
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 17th European Conference on Antennas and Propagation, EuCAP 2023
Y2 - 26 March 2023 through 31 March 2023
ER -