Dr. Carlos G. Juan
Institute of Bioengineering, Miguel Hernandez University, Elche, Spain
"Ramón y Cajal" Associate Professor at Miguel Hernández Univ...
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Academic Career Length
12Years (2015-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications24 September 2018 in IEEE Transactions on Instrumentation and Measurement
Journal Article
Carlos G. JuanEBEnrique Bronchalo
Enrique Bronchalo
Benjamin PotelonCQCédric Quendo
Cédric Quendo
Ernesto Ávila
Jose Maria Sabater-NavarroA glucose concentration sensor for microliter-volume water-glucose solutions is presented. The proposed sensor is composed of an open-loop microstrip resonator with a dielectric liquid holder (5-25-μL volume) glued onto the gap between the line ends. The resonator is coupled to two microstrip lines forming a two-port network whose S-parameter response provide information about the dielectric properties of the liquid under study. Three versions of the sensor at resonant frequencies between 2 and 7 GHz are presented. The sensors are assessed by measuring the complex permittivity of standard liquids reported in the scientific literature. Models of the sensors are presented, which properly match the experimental results. This paper presents an experimental study of the sensors as glucose concentration retrievers. The main novelty is the use of Q factor and the maximum S21 of the resonance as sensing magnitudes. The dependence of these parameters on the glucose concentration of the solutions obeys almost linear relationships. Good sensitivities have been obtained for the proposed sensors, which are coherent with previous works by other authors.
Journal Article
Carlos G. JuanBenjamin PotelonCQCédric Quendo
Cédric QuendoEBEnrique Bronchalo
Enrique BronchaloThe measurement of glucose concentration finds interesting potential applications in both industry and biomedical contexts. Among the proposed solutions, the use of microwave planar resonant sensors has led to remarkable scientific activity during the last years. These sensors rely on the changes in the dielectric properties of the medium due to variations in the glucose concentration. These devices show electrical responses dependent on the surrounding dielectric properties, and therefore the changes in their response can be related to variations in the glucose content. This work shows an up-to-date review of this sensing approach after more than one decade of research and development. The attempts involved are sorted by the sensing parameter, and the computation of a common relative sensitivity to glucose is proposed as general comparison tool. The manuscript also discusses the key points of each sensor category and the possible future lines and challenges of the sensing approach.
Journal Article
Carlos G. JuanEBEnrique Bronchalo
Enrique BronchaloBenjamin PotelonCQCédric Quendo
Cédric QuendoJSJosé M. Sabater-Navarro
José M. Sabater-Navarro
Three microwave sensors are used to track the glucose level of different human blood plasma solutions. In this paper, the sensors are evaluated as glucose trackers in a context close to real human blood. Different plasma solutions sets were prepared from a human blood sample at several added glucose concentrations up to 10 wt%, adding also ascorbic acid and lactic acid at different concentrations. The experimental results for the different sensors/solutions combinations are presented in this work. The sensors show good performance and linearity as glucose level retrievers, although the sensitivities change as the rest of components vary. Different sensor behaviors depending upon the concentrations of glucose and other components are identified and characterized. The results obtained in terms of sensitivity are coherent with previous works, highlighting the contribution of glucose to the dielectric losses of the solution. The results are also consistent with the frequency evolution of the electromagnetic signature of glucose found in the literature, and are helpful for selecting frequency bands for sensing purposes and envisioning future approaches to the challenging measurement in real biological contexts. Discussion of the implications of the results and guidelines for further research and development of more accurate sensors is offered.
25 October 2021 in IEEE Transactions on Instrumentation and Measurement
Journal Article
Carlos G. JuanBenjamin PotelonCQCédric Quendo
Cédric Quendo
Héctor García-MartínezErnesto ÁvilaJose Maria Sabater-Navarro +1
A low-cost, additively manufactured, biocompatible glucose sensor based on the changes in the unloaded quality factor ( $Q_{\mathbf {u}}$ ) with a single split-ring resonator is presented. An exposition of the fundamentals for the use of the $Q_{\mathbf {u}}$ as sensing parameter with microwave planar resonant sensors is shown. The convenience of this sensing parameter is analyzed from the theoretical point of view, and practical design and optimization guidelines are inferred with a special focus on the optimization of $Q_{\mathbf {u}}$ sensitivity to glucose concentration. For practical demonstration and experimental assessment, a novel inverted microstrip configuration is considered, built upon a customized structure made with a certified biocompatible material thanks to 3-D printing techniques, which is aimed to provide for a stronger interaction between the electromagnetic fields and the sample. Two metallization solutions are investigated, yielding devices operating at 4.50 and 4.62 GHz, with operating $Q_{\mathbf {u}}$ of 16.36 and 22.00, relative $Q_{\mathbf {u}}$ sensitivities of 1.377 and 2.727, $Q_{\mathbf {u}}$ sensitivities to glucose content within the physiological range of $0.3\times 10^{-3}$ per mg/dL and $0.6\times 10^{-3}$ per mg/dL, sensing areas of approximately $11.7\times8.8$ mm 2 and total structure sizes of 950.0 $\times 35.0\times3.5$ mm 3 . The devices show good performance with water–glucose solutions covering a wide range of concentrations, involving physiological as well as industry-related ones.
29 January 2021 in IEEE Sensors Letters
Journal Article
AAAnyela Aquino
Anyela Aquino
Carlos G. JuanBenjamin PotelonCQCédric Quendo
Cédric QuendoAccurate characterization of the dielectric properties of solids and, especially, substrates is crucial for circuitry design and development. For applications requiring low cost, wieldy systems, many attempts have been made involving planar resonant microwave devices. However, most of them have a configuration in which the sample is placed onto the substrate. As a novelty, a structure considering the sample placement into a more sensitive area is presented and analyzed in this letter. The design of this kind of sensors is discussed, and the measurement results are presented. The proposed device is shown to be capable of measuring the full complex permittivity of the sample, and the results compare well with other previous attempts.
1 October 2019
Conference Paper
Carlos G. JuanBPBenjamin Potelon
Benjamin Potelon
CQCedric Quendo
Cedric Quendo
EBEnrique Bronchalo
Enrique Bronchalo
JSJose M. Sabater-Navarro
Jose M. Sabater-Navarro
About Me
Carlos G. Juan was born in Petrer, Spain on July 2, 1991. He received the M.Sc. and the Ph.D. degrees in electronics engineering (with honors) from Miguel Hernández University (UMH), Elche, Spain, in 2014 and 2019, respectively, where he joined the Neuroengineering Biomedical (nBio) Research Group as a Research Fellow.
He was a Visiting Researcher with the Lab-STICC Group, Université de Bretagne Occidentale (UBO), Brest, France, in 2016 and 2018. During 2019–2020 he was an Adjunct Professor with the Department of Materials Science, Optics and Electronic Technology, UMH. During 2020–2021 he was a Postdoctoral Research Fellow with Lab-STICC, UBO. Since 2022 he is a Postdoctoral Research Fellow with the Medical Robotics Group, University of Málaga, Málaga, Spain, jointly with the Institute of Bioengineering, UMH. His main research interests include microwave engineering, antenna and propagation, electronics and computer science applied to bioengineering.
Dr. Juan was a recipient of the CEA-Springer Award to the Best PhD Thesis in Bioengineering 2020, awarded by the Spanish Committee in Automatic Control (CEA), as well as the Extraordinary Ph.D. Award from Miguel Hernández University of Elche in 2022. He has held several prestigious national and international research grants. He authored 1 scientific book, and serves as a as a Regular Reviewer for several highly-impacted journals. Since 2015, he has authored more than 25 scientific publications.
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