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Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. A Reduced Sampling Scheme for Planar Nearfield Measurements Using Pointwise Probe Correction in the Spherical Harmonics Basis
 Institute of Electrical and Electronics Engineers IEEE: PhotonIcs & Electromagnetics Research Symposium  Spring, PIERSSpring 2019. Proceedings : 1720 June 2019, Rome, Italy Piscataway, NJ: IEEE, 2019 ISBN: 9781728134048 ISBN: 9781728134031 S.809816 
 PhotonIcs & Electromagnetics Research Symposium (PIERSSpring) <41, 2019, Rome> 

 Englisch 
 Konferenzbeitrag 
 Fraunhofer FHR () 
Abstract
Planar NearField (PNF) measurements are a reliable way to determine the radiation characteristics of an Antenna Under Test (AUT) when only a plane is of interest and farfield measurements are not an option. This plane is classically sampled in Cartesian coordinates on a grid following the Nyquist criterion, i.e., using sampling points with a distance of at least λ/2 in both axes. This sampling is normally kept independently of the distance between the plane and the AUT. Spherical NearField (SNF) measurements, on the other hand, are classically performed by sampling the surface of the minimum sphere enclosing the AUT following the Nyquist criterion. In this work, a reduced sampling grid for PNF measurements is introduced by using the radial projection of the sampling points on the minimum sphere of a classical SNF measurement onto a plane. Depending on the sampling, different solvers in the spherical harmonics basis are considered and the spherical mode coefficients are calculated. To describe the sampling points on a plane, pointwise probe correction is used, where different probe response constants are calculated for each measurement point. In this way, a different probe distance and probe orientation at each point are considered. Reconstruction results are compared to those of standard PNF sampling, showing that a reduction of measurement points by processing the acquired data in another basis is possible.