title: Combination of spherical and planar scanning for phaseless near-field antenna measurements
creator: Rodríguez Varela, Fernando
creator: Galocha Iragüen, Belen
creator: Sierra Castañer, Manuel
creator: Fernández Álvarez, Javier
creator: Mattes, Michael
creator: Breinbjerg, Olav
subject: Electronics
subject: Telecommunications
description: The two scans phaseless technique is a well-known procedure for the characterization of antennas on near-field ranges without need of measuring the phase. Amplitude information over two surfaces compensates for the lack of phase reference. In this paper we propose the combination of spherical and planar surfaces for the application of the two scans technique, together with the application of Wirtinger Flow, a state-of-the art phase retrieval algorithm with high convergence guarantees. The use of different types of surface adds additional information about the field’s degrees of freedom, allowing for smaller separation between acquisition surfaces as compared with the 2-sphere techniques. In addition, an initial estimation for the phase is not required. The phase retrieval process is formulated in terms of the Spherical Wave Expansion (SWE) of the antenna under test. The SWE-to-PWE (Plane Wave Expansion) is utilized in order to process the amplitude field on the planar surface. Results for simulated and measured near-field data are shown to demonstrate the potential capabilities of the proposed technique.
publisher: E.T.S.I. Telecomunicación (UPM)
rights: https://creativecommons.org/licenses/by-nc-nd/3.0/es/
date: 2019-11
type: info:eu-repo/semantics/conferenceObject
type: Presentation at Congress or Conference
source: Proceedings of  Antenna Measurement Techniques Association Symposium (AMTA) 2019 | Antenna Measurement Techniques Association Symposium (AMTA) 2019 | 06/10/2019 - 11/10/2019 | San Diego, California, USA
type: PeerReviewed
format: application/pdf
language: eng
relation: https://ieeexplore.ieee.org/document/8906466
relation: info:eu-repo/grantAgreement/MINECO//TEC2017-85529-C3-1-R
rights: info:eu-repo/semantics/openAccess
relation: info:eu-repo/semantics/altIdentifier/doi/10.23919/AMTAP.2019.8906466
identifier: https://oa.upm.es/64812/