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Planar Phase-Variation Microwave Sensors for Material Characterization: A Review and Comparison of Various Approaches

1
CIMITEC, Departament d’Enginyeria Electrònica, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
2
Departamento Ingeniería Audiovisual y Comunicaciones, Universidad Politécnica de Madrid, 28031 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Guillermo Villanueva
Sensors 2021, 21(4), 1542; https://doi.org/10.3390/s21041542
Received: 5 January 2021 / Revised: 17 February 2021 / Accepted: 18 February 2021 / Published: 23 February 2021
(This article belongs to the Special Issue Feature Papers in Physical Sensors Section 2020)
Planar phase-variation microwave sensors have attracted increasing interest in recent years since they combine the advantages of planar technology (including low cost, low profile, and sensor integration with the associated circuitry for post-processing and communication purposes, among others) and the possibility of operation at a single frequency (thereby reducing the costs of the associated electronics). This paper reviews and compares three different strategies for sensitivity improvement in such phase-variation sensors (devoted to material characterization). The considered approaches include line elongation (through meandering), dispersion engineering (by considering slow-wave artificial transmission lines), and reflective-mode sensors based on step-impedance open-ended lines. It is shown that unprecedented sensitivities compatible with small sensing regions are achievable with the latter approach. View Full-Text
Keywords: microwave sensors; stepped-impedance transmission lines; slow-wave transmission lines; meander lines; dielectric constant sensor; phase-variation sensors microwave sensors; stepped-impedance transmission lines; slow-wave transmission lines; meander lines; dielectric constant sensor; phase-variation sensors
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MDPI and ACS Style

Muñoz-Enano, J.; Coromina, J.; Vélez, P.; Su, L.; Gil, M.; Casacuberta, P.; Martín, F. Planar Phase-Variation Microwave Sensors for Material Characterization: A Review and Comparison of Various Approaches. Sensors 2021, 21, 1542. https://doi.org/10.3390/s21041542

AMA Style

Muñoz-Enano J, Coromina J, Vélez P, Su L, Gil M, Casacuberta P, Martín F. Planar Phase-Variation Microwave Sensors for Material Characterization: A Review and Comparison of Various Approaches. Sensors. 2021; 21(4):1542. https://doi.org/10.3390/s21041542

Chicago/Turabian Style

Muñoz-Enano, Jonathan; Coromina, Jan; Vélez, Paris; Su, Lijuan; Gil, Marta; Casacuberta, Pau; Martín, Ferran. 2021. "Planar Phase-Variation Microwave Sensors for Material Characterization: A Review and Comparison of Various Approaches" Sensors 21, no. 4: 1542. https://doi.org/10.3390/s21041542

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