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Sensors 2016, 16(7), 967; doi:10.3390/s16070967

Comparison of Metal-Backed Free-Space and Open-Ended Coaxial Probe Techniques for the Dielectric Characterization of Aeronautical Composites

1
Radiofrequency Area, National Institute for Aerospace Technology (INTA), Torrejón de Ardoz, 28850 Madrid, Spain
2
Department Antenna Technology and Electromagnetic Modelling AEM, Fraunhofer Institute for High Frequency Physics and Radar Techniques (FHR), 53343 Wachtberg, Germany
This paper is an extended version of our paper published in Castaño-Joaqui, J.; Escot-Bocanegra, D.; Poyatos-Martínez, D.; López-Rodríguez, P. Experimental evaluation of different algorithms for permittivity estimation of aeronautic materials based on metal-backed free-space measurements. In Proceedings of the 2nd International Electronic Conference on Sensors and Applications, Basel, Switzerland, 15–30 November 2015.
*
Author to whom correspondence should be addressed.
Academic Editor: Dirk Lehmhus
Received: 31 March 2016 / Revised: 17 June 2016 / Accepted: 20 June 2016 / Published: 24 June 2016
View Full-Text   |   Download PDF [6893 KB, uploaded 24 June 2016]   |  

Abstract

The trend in the last few decades is that current unmanned aerial vehicles are completely made of composite materials rather than metallic, such as carbon-fiber or fiberglass composites. From the electromagnetic point of view, this fact forces engineers and scientists to assess how these materials may affect their radar response or their electronics in terms of electromagnetic compatibility. In order to evaluate this, electromagnetic characterization of different composite materials has become a need. Several techniques exist to perform this characterization, all of them based on the utilization of different sensors for measuring different parameters. In this paper, an implementation of the metal-backed free-space technique, based on the employment of antenna probes, is utilized for the characterization of composite materials that belong to an actual drone. Their extracted properties are compared with those given by a commercial solution, an open-ended coaxial probe (OECP). The discrepancies found between both techniques along with a further evaluation of the methodologies, including measurements with a split-cavity resonator, conclude that the implemented free-space technique provides more reliable results for this kind of composites than the OECP technique. View Full-Text
Keywords: antenna probes; permittivity; characterization; free-space; composite materials; fiberglass; coaxial probe; split cavity resonator antenna probes; permittivity; characterization; free-space; composite materials; fiberglass; coaxial probe; split cavity resonator
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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López-Rodríguez, P.; Escot-Bocanegra, D.; Poyatos-Martínez, D.; Weinmann, F. Comparison of Metal-Backed Free-Space and Open-Ended Coaxial Probe Techniques for the Dielectric Characterization of Aeronautical Composites. Sensors 2016, 16, 967.

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