Spherical Phaseless Probe-Corrected Near-Field Measurements of the DTU-ESA VAST12 Reflector Antenna

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Abstract

An experimental case of spherical probe-corrected phaseless near-field measurements with the two-scans technique is presented, based on magnitude measurements at two surfaces of the VAST12 reflector antenna performed at the DTU-ESA Facility. Phase retrieval using strictly the directly measured near-field
magnitude was unfeasible in this setup, due to the small sphere separation allowed by the probe positioner, which led to incorrect and excessively slow convergence. Phase retrieval with larger separation between spheres has shown remarkable results. For these tests a measured magnitude was used in combination with calculated near-field magnitudes at different (larger and smaller) spheres with larger separations than allowed by the experimental setup. It has been seen that larger separation between measurement spheres improves accuracy of phase retrieval. A measurement with a backprojected measurement with 3m sphere separation is of particular interest because it can be potentially replicated in the DTU-ESA Facility assuming such range of movement was allowed, while being accurate down to an error of less than -35dB. Measurements with larger spheres show even better accuracy. These good results were obtained with the normal spatial sampling rate for complex measurements and with a very simple Hertzian dipole initial guess, and show the superior performance of spherical phaseless measurements with the two-scans technique, compared to a planar setup.
Original languageEnglish
Title of host publicationProceedings of the​ ​40th​ ​Annual​ ​Meeting​ ​and​ ​Symposium​ ​of​ ​the​ ​Antenna​ ​Measurement​ ​Techniques Association
PublisherIEEE
Publication date2018
Pages216-221
Publication statusPublished - 2018
Event40th​ ​Annual​ ​Meeting​ ​and​ ​Symposium​ ​of​ ​the​ ​Antenna​ ​Measurement​ ​Techniques Association - Williamsburg Lodge, Williamsburg, United States
Duration: 4 Nov 20189 Nov 2018
https://amta2018.org/

Conference

Conference40th​ ​Annual​ ​Meeting​ ​and​ ​Symposium​ ​of​ ​the​ ​Antenna​ ​Measurement​ ​Techniques Association
LocationWilliamsburg Lodge
CountryUnited States
CityWilliamsburg
Period04/11/201809/11/2018
Internet address

Bibliographical note

Proceedings of the 40th Annual Symposium of the Antenna Measurement Techniques Association, Williamsburg, VA, USA, 2018, pp 216-221

Cite this

Fernandez Alvarez, J., Bjørstorp, J. M., & Breinbjerg, O. (2018). Spherical Phaseless Probe-Corrected Near-Field Measurements of the DTU-ESA VAST12 Reflector Antenna. In Proceedings of the​ ​40th​ ​Annual​ ​Meeting​ ​and​ ​Symposium​ ​of​ ​the​ ​Antenna​ ​Measurement​ ​Techniques Association (pp. 216-221). IEEE.
Fernandez Alvarez, Javier ; Bjørstorp, Jeppe Majlund ; Breinbjerg, Olav. / Spherical Phaseless Probe-Corrected Near-Field Measurements of the DTU-ESA VAST12 Reflector Antenna. Proceedings of the​ ​40th​ ​Annual​ ​Meeting​ ​and​ ​Symposium​ ​of​ ​the​ ​Antenna​ ​Measurement​ ​Techniques Association. IEEE, 2018. pp. 216-221
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title = "Spherical Phaseless Probe-Corrected Near-Field Measurements of the DTU-ESA VAST12 Reflector Antenna",
abstract = "An experimental case of spherical probe-corrected phaseless near-field measurements with the two-scans technique is presented, based on magnitude measurements at two surfaces of the VAST12 reflector antenna performed at the DTU-ESA Facility. Phase retrieval using strictly the directly measured near-fieldmagnitude was unfeasible in this setup, due to the small sphere separation allowed by the probe positioner, which led to incorrect and excessively slow convergence. Phase retrieval with larger separation between spheres has shown remarkable results. For these tests a measured magnitude was used in combination with calculated near-field magnitudes at different (larger and smaller) spheres with larger separations than allowed by the experimental setup. It has been seen that larger separation between measurement spheres improves accuracy of phase retrieval. A measurement with a backprojected measurement with 3m sphere separation is of particular interest because it can be potentially replicated in the DTU-ESA Facility assuming such range of movement was allowed, while being accurate down to an error of less than -35dB. Measurements with larger spheres show even better accuracy. These good results were obtained with the normal spatial sampling rate for complex measurements and with a very simple Hertzian dipole initial guess, and show the superior performance of spherical phaseless measurements with the two-scans technique, compared to a planar setup.",
author = "{Fernandez Alvarez}, Javier and Bj{\o}rstorp, {Jeppe Majlund} and Olav Breinbjerg",
note = "Proceedings of the 40th Annual Symposium of the Antenna Measurement Techniques Association, Williamsburg, VA, USA, 2018, pp 216-221",
year = "2018",
language = "English",
pages = "216--221",
booktitle = "Proceedings of the​ ​40th​ ​Annual​ ​Meeting​ ​and​ ​Symposium​ ​of​ ​the​ ​Antenna​ ​Measurement​ ​Techniques Association",
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Fernandez Alvarez, J, Bjørstorp, JM & Breinbjerg, O 2018, Spherical Phaseless Probe-Corrected Near-Field Measurements of the DTU-ESA VAST12 Reflector Antenna. in Proceedings of the​ ​40th​ ​Annual​ ​Meeting​ ​and​ ​Symposium​ ​of​ ​the​ ​Antenna​ ​Measurement​ ​Techniques Association. IEEE, pp. 216-221, 40th​ ​Annual​ ​Meeting​ ​and​ ​Symposium​ ​of​ ​the​ ​Antenna​ ​Measurement​ ​Techniques Association, Williamsburg, United States, 04/11/2018.

Spherical Phaseless Probe-Corrected Near-Field Measurements of the DTU-ESA VAST12 Reflector Antenna. / Fernandez Alvarez, Javier; Bjørstorp, Jeppe Majlund; Breinbjerg, Olav.

Proceedings of the​ ​40th​ ​Annual​ ​Meeting​ ​and​ ​Symposium​ ​of​ ​the​ ​Antenna​ ​Measurement​ ​Techniques Association. IEEE, 2018. p. 216-221.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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N1 - Proceedings of the 40th Annual Symposium of the Antenna Measurement Techniques Association, Williamsburg, VA, USA, 2018, pp 216-221

PY - 2018

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N2 - An experimental case of spherical probe-corrected phaseless near-field measurements with the two-scans technique is presented, based on magnitude measurements at two surfaces of the VAST12 reflector antenna performed at the DTU-ESA Facility. Phase retrieval using strictly the directly measured near-fieldmagnitude was unfeasible in this setup, due to the small sphere separation allowed by the probe positioner, which led to incorrect and excessively slow convergence. Phase retrieval with larger separation between spheres has shown remarkable results. For these tests a measured magnitude was used in combination with calculated near-field magnitudes at different (larger and smaller) spheres with larger separations than allowed by the experimental setup. It has been seen that larger separation between measurement spheres improves accuracy of phase retrieval. A measurement with a backprojected measurement with 3m sphere separation is of particular interest because it can be potentially replicated in the DTU-ESA Facility assuming such range of movement was allowed, while being accurate down to an error of less than -35dB. Measurements with larger spheres show even better accuracy. These good results were obtained with the normal spatial sampling rate for complex measurements and with a very simple Hertzian dipole initial guess, and show the superior performance of spherical phaseless measurements with the two-scans technique, compared to a planar setup.

AB - An experimental case of spherical probe-corrected phaseless near-field measurements with the two-scans technique is presented, based on magnitude measurements at two surfaces of the VAST12 reflector antenna performed at the DTU-ESA Facility. Phase retrieval using strictly the directly measured near-fieldmagnitude was unfeasible in this setup, due to the small sphere separation allowed by the probe positioner, which led to incorrect and excessively slow convergence. Phase retrieval with larger separation between spheres has shown remarkable results. For these tests a measured magnitude was used in combination with calculated near-field magnitudes at different (larger and smaller) spheres with larger separations than allowed by the experimental setup. It has been seen that larger separation between measurement spheres improves accuracy of phase retrieval. A measurement with a backprojected measurement with 3m sphere separation is of particular interest because it can be potentially replicated in the DTU-ESA Facility assuming such range of movement was allowed, while being accurate down to an error of less than -35dB. Measurements with larger spheres show even better accuracy. These good results were obtained with the normal spatial sampling rate for complex measurements and with a very simple Hertzian dipole initial guess, and show the superior performance of spherical phaseless measurements with the two-scans technique, compared to a planar setup.

M3 - Article in proceedings

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BT - Proceedings of the​ ​40th​ ​Annual​ ​Meeting​ ​and​ ​Symposium​ ​of​ ​the​ ​Antenna​ ​Measurement​ ​Techniques Association

PB - IEEE

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Fernandez Alvarez J, Bjørstorp JM, Breinbjerg O. Spherical Phaseless Probe-Corrected Near-Field Measurements of the DTU-ESA VAST12 Reflector Antenna. In Proceedings of the​ ​40th​ ​Annual​ ​Meeting​ ​and​ ​Symposium​ ​of​ ​the​ ​Antenna​ ​Measurement​ ​Techniques Association. IEEE. 2018. p. 216-221