eprintid: 64812 rev_number: 11 eprint_status: archive userid: 1903 dir: disk0/00/06/48/12 datestamp: 2021-03-27 10:48:40 lastmod: 2021-03-27 10:48:40 status_changed: 2021-03-27 10:48:40 type: conference_item metadata_visibility: show creators_name: Rodríguez Varela, Fernando creators_name: Galocha Iragüen, Belen creators_name: Sierra Castañer, Manuel creators_name: Fernández Álvarez, Javier creators_name: Mattes, Michael creators_name: Breinbjerg, Olav creators_id: frodriguezv@gr.ssr.upm.es creators_id: manuel.sierra@upm.es title: Combination of spherical and planar scanning for phaseless near-field antenna measurements publisher: IEEE rights: by-nc-nd ispublished: pub subjects: electronica subjects: telecomunicaciones full_text_status: public pres_type: paper abstract: 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. date_type: published date: 2019-11 pagerange: 1-6 event_title: Antenna Measurement Techniques Association Symposium (AMTA) 2019 event_location: San Diego, California, USA event_dates: 06/10/2019 - 11/10/2019 event_type: conference id_number: 10.23919/AMTAP.2019.8906466 institution: Telecomunicacion department: Senales refereed: TRUE isbn: 978-1-7281-4525-9 book_title: Proceedings of Antenna Measurement Techniques Association Symposium (AMTA) 2019 official_url: https://ieeexplore.ieee.org/document/8906466 comprojects_type: MINECO comprojects_code: TEC2017-85529-C3-1-R comprojects_acronym: FUTURE-RADIO comprojects_title: Radio systems and technologies for high capacity terrestrial and satellite communications in an hyperconnected work citation: Rodríguez Varela, Fernando and Galocha Iragüen, Belen and Sierra Castañer, Manuel and Fernández Álvarez, Javier and Mattes, Michael and Breinbjerg, Olav (2019). Combination of spherical and planar scanning for phaseless near-field antenna measurements. In: "Antenna Measurement Techniques Association Symposium (AMTA) 2019", 06/10/2019 - 11/10/2019, San Diego, California, USA. ISBN 978-1-7281-4525-9. pp. 1-6. https://doi.org/10.23919/AMTAP.2019.8906466 . document_url: https://oa.upm.es/64812/1/INVE_MEM_2019_321280.pdf