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Instrum. Meas."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"563","DOI":"10.1109\/LMWC.2014.2318900","article-title":"Complementary split-ring resonators for measuring dielectric constants and loss tangents","volume":"24","author":"Lee","year":"2014","journal-title":"IEEE Microw. Wirel. Components Lett."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"247","DOI":"10.1109\/TMTT.2015.2503764","article-title":"Noncontact measurement of complex permittivity and thickness by using planar resonators","volume":"64","author":"Yang","year":"2015","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"2023","DOI":"10.1109\/TMTT.2013.2255885","article-title":"Recent advances in microwave-based dielectric spectroscopy at the cellular level for cancer investigations","volume":"61","author":"Grenier","year":"2013","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1016\/S0924-4247(01)00624-0","article-title":"Design, and application of a wireless, passive, resonant-circuit environmental monitoring sensor","volume":"93","author":"Ong","year":"2001","journal-title":"Sens. Actuators A Phys."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1876","DOI":"10.1109\/TAP.2019.2938609","article-title":"Differential sensor based on electroinductive wave transmission lines for dielectric constant measurements and defect detection","volume":"68","author":"Gil","year":"2020","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"4450","DOI":"10.1109\/TMTT.2017.2693981","article-title":"Application of split ring resonator (SRR) loaded transmission lines to the design of angular displacement and velocity sensors for space applications","volume":"65","author":"Herrojo","year":"2017","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"3673","DOI":"10.1109\/JSEN.2019.2895015","article-title":"High-density microwave encoders for motion control and near-field chipless-RFID","volume":"19","author":"Herrojo","year":"2019","journal-title":"IEEE Sens. J."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"248","DOI":"10.1109\/JSEN.2014.2345477","article-title":"Detection of volatile organic compounds using microwave sensors","volume":"15","author":"Zarifi","year":"2015","journal-title":"IEEE Sens. J."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"972","DOI":"10.1109\/TMTT.2012.2231877","article-title":"A microwave and microfluidic planar resonator for efficient and accurate complex permittivity characterization of aqueous solutions","volume":"61","author":"Chretiennot","year":"2012","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"139","DOI":"10.1038\/s41598-017-18621-2","article-title":"Noncontact and nonintrusive microwave-microfluidic flow sensor for energy and biomedical engineering","volume":"8","author":"Zarifi","year":"2018","journal-title":"Sci. Rep."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Wei, P., Morey, B., Dyson, T., McMahon, N., Hsu, Y.-Y., Gazman, S., Klinker, L., Ives, B., Dowling, K., and Rafferty, C. (2013). A conformal sensor for wireless sweat level monitoring. IEEE Sens., 1\u20134.","DOI":"10.1109\/ICSENS.2013.6688376"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"3119","DOI":"10.1109\/JSEN.2014.2357257","article-title":"Recent advances in wearable sensors for health monitoring","volume":"15","author":"Rodgers","year":"2014","journal-title":"IEEE Sens. J."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"2187","DOI":"10.1049\/el:19951506","article-title":"Integrated microwave power sensor","volume":"31","author":"Krozer","year":"1995","journal-title":"Electron. Lett."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"3587","DOI":"10.1109\/JSEN.2016.2538086","article-title":"Submersible printed split-ring resonator-based sensor for thin-film detection and permittivity characterization","volume":"16","author":"Gil","year":"2016","journal-title":"IEEE Sens. J."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Wei, Z., Huang, J., Li, J., Xu, G., Ju, Z., Liu, X., and Ni, X. (2018). A high-sensitivity microfluidic sensor based on a substrate integrated waveguide re-entrant cavity for complex permittivity measurement of liquids. Sensors, 18.","DOI":"10.3390\/s18114005"},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Castillo-Le\u00f3n, J., and Svendsen, W.E. (2015). Lab-on-a-Chip Devices and Micro-Total Analysis Systems, Springer.","DOI":"10.1007\/978-3-319-08687-3"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Mu\u00f1oz-Enano, J., V\u00e9lez, P., Gil, M., and Mart\u00edn, F. (2020). Planar microwave resonant sensors: A review and recent developments. Appl. Sci., 10.","DOI":"10.3390\/app10072615"},{"key":"ref_19","unstructured":"Mandel, C., Kubina, B., Sch\u00fc\u00dfler, M., and Jakoby, R. (2011, January 10\u201313). Passive chipless wireless sensor for two-dimensional displacement measurement. Proceedings of the 41st European Microwave Conference, Manchester, UK."},{"key":"ref_20","unstructured":"Puentes, M. (2014). Planar Metamaterial Based Microwave Sensor Arrays for Biomedical Analysis and Treatment, Springer."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1345","DOI":"10.1109\/JSEN.2013.2295312","article-title":"High-sensitivity metamaterial-inspired sensor for microfluidic dielectric characterization","volume":"14","author":"Ebrahimi","year":"2013","journal-title":"IEEE Sens. J."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1109\/MMM.2011.2181448","article-title":"Metamaterial inspired microwave sensors","volume":"13","author":"Mandel","year":"2012","journal-title":"IEEE Microw. Mag."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"233","DOI":"10.1016\/j.sna.2012.10.027","article-title":"Metamaterial-based microfluidic sensor for dielectric characterization","volume":"189","author":"Withayachumnankul","year":"2013","journal-title":"Sens. Actuators A Phys."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Salim, A., and Lim, S. (2016). Complementary split-ring resonator-loaded microfluidic ethanol chemical sensor. Sensors, 16.","DOI":"10.3390\/s16111802"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Su, L., Mata-Contreras, J., V\u00e9lez, P., Fernandez-Prieto, A., and Mart\u00edn, F. (2018). Analytical method to estimate the complex permittivity of oil samples. Sensors, 18.","DOI":"10.3390\/s18040984"},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Abdolrazzaghi, M., Zarifi, M.H., and Daneshmand, M. (2016). Sensitivity enhancement of split ring resonator based liquid sensors. IEEE Sens., 1\u20133.","DOI":"10.1109\/ICSENS.2016.7808957"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"323","DOI":"10.1109\/JSEN.2016.2631618","article-title":"Robust ultra-high-resolution microwave planar sensor using fuzzy neural network approach","volume":"17","author":"Abdolrazzaghi","year":"2017","journal-title":"IEEE Sens. J."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"7981","DOI":"10.1109\/JSEN.2017.2757027","article-title":"Monitoring solid particle deposition in lossy medium using planar resonator sensor","volume":"17","author":"Zarifi","year":"2017","journal-title":"IEEE Sens. J."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1626","DOI":"10.1109\/TIE.2017.2733449","article-title":"A microwave ring resonator sensor for early detection of breaches in pipeline coatings","volume":"65","author":"Zarifi","year":"2017","journal-title":"IEEE Trans. Ind. Electron."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1843","DOI":"10.1109\/TMTT.2018.2791942","article-title":"Strongly enhanced sensitivity in planar microwave sensors based on metamaterial coupling","volume":"66","author":"Abdolrazzaghi","year":"2018","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"4269","DOI":"10.1109\/TMTT.2019.2932737","article-title":"Ultrahigh-sensitivity microwave sensor for microfluidic complex permittivity measurement","volume":"67","author":"Ebrahimi","year":"2019","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Ferr\u00e1ndez-Pastor, F.-J., Garc\u00eda-Chamizo, J.M., and Nieto-Hidalgo, M. (2017). Electromagnetic differential measuring method: Application in microstrip sensors developing. Sensors, 17.","DOI":"10.3390\/s17071650"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"178","DOI":"10.1109\/JSEN.2019.2941050","article-title":"An analytical method to implement high-sensitivity transmission line differential sensors for dielectric constant measurements","volume":"20","author":"Martin","year":"2020","journal-title":"IEEE Sens. J."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Coromina, J., Mu\u00f1oz-Enano, J., V\u00e9lez, P., Ebrahimi, A., Scott, J., Ghorbani, K., and Mart\u00edn, F. (2021, January 12\u201314). Capacitively-Loaded Slow-Wave Transmission Lines for Sensitivity Improvement in Phase-Variation Permittivity Sensors. Proceedings of the 50th European Microwave Conference, Utrecht, The Netherlands.","DOI":"10.23919\/EuMC48046.2021.9338025"},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Damm, C., Sch\u00fc\u00dfler, M., Puentes, M., Maune, H., Maasch, M., and Jakoby, R. (2009). Artificial transmission lines for highly sensitive microwave sensors. IEEE Sens., 755\u2013758.","DOI":"10.1109\/ICSENS.2009.5398538"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"18","DOI":"10.1016\/j.sna.2014.01.030","article-title":"Two-dimensional alignment and displacement sensor based on movable broadside-coupled split ring resonators","volume":"210","author":"Horestani","year":"2014","journal-title":"Sens. Actuators A Phys."},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Naqui, J., Damm, C., Wiens, A., Jakoby, R., Su, L., and Mart\u00edn, F. (2014). Transmission lines loaded with pairs of magnetically coupled stepped impedance resonators (SIRs): Modeling and application to microwave sensors. IEEE MTT-S Int. Microw. Symp., 1\u20134.","DOI":"10.1109\/MWSYM.2014.6848494"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"68","DOI":"10.1109\/LAWP.2014.2355035","article-title":"Modeling metamaterial transmission lines loaded with pairs of coupled split-ring resonators","volume":"14","author":"Su","year":"2015","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_39","doi-asserted-by":"crossref","unstructured":"Su, L., Naqui, J., Mata, J., and Mart\u00edn, F. (2015, January 7\u201312). Dual-Band Epsilon-Negative (ENG) Transmission Line Metamaterials Based on Microstrip Lines Loaded with Pairs of Coupled Complementary Split Ring Resonators (CSRRs): Modeling, Analysis and Applications. Proceedings of the 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS), Oxford, UK.","DOI":"10.1109\/MetaMaterials.2015.7342428"},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Su, L., Naqui, J., Mata-Contreras, J., V\u00e9lez, P., and Mart\u00edn, F. (2015, January 7\u201311). Transmission line metamaterials based on pairs of coupled split ring resonators (SRRs) and complementary split ring resonators (CSRR): A comparison to the light of the lumped element equivalent circuits. Proceedings of the 2015 International Conference on Electromagnetics in Advanced Applications (ICEAA), Torino, Italy.","DOI":"10.1109\/ICEAA.2015.7297242"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"154","DOI":"10.1109\/LAWP.2015.2435656","article-title":"Modeling and applications of metamaterial transmission lines loaded with pairs of coupled complementary split-ring resonators (CSRRs)","volume":"15","author":"Su","year":"2016","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"3864","DOI":"10.1109\/TMTT.2016.2610423","article-title":"Transmission lines loaded with pairs of stepped impedance resonators: Modeling and application to differential permittivity measurements","volume":"64","author":"Naqui","year":"2016","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1109\/TMTT.2016.2623311","article-title":"Splitter\/combiner microstrip sections loaded with pairs of complementary aplit ring resonators (CSRRs): Modeling and optimization for differential sensing applications","volume":"64","author":"Su","year":"2016","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"6589","DOI":"10.1109\/JSEN.2017.2747764","article-title":"Microwave microfluidic sensor based on a microstrip splitter\/combiner configuration and split ring resonators (SRRs) for dielectric characterization of liquids","volume":"17","author":"Su","year":"2017","journal-title":"IEEE Sens. J."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"5786","DOI":"10.1109\/JSEN.2018.2840691","article-title":"Differential sensors using microstrip lines loaded with two split-ring resonators","volume":"18","author":"Ebrahimi","year":"2018","journal-title":"IEEE Sens. J."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"7545","DOI":"10.3390\/s110807545","article-title":"Novel sensors based on the symmetry properties of split ring resonators (SRRs)","volume":"11","author":"Naqui","year":"2011","journal-title":"Sensors"},{"key":"ref_47","doi-asserted-by":"crossref","unstructured":"Naqui, J., Dur\u00e1n-Sindreu, M., and Mart\u00edn, F. (2012). On the symmetry properties of coplanar waveguides loaded with symmetric resonators: Analysis and potential applications. IEEE\/MTT-S Int. Microwave Symp. Digest, 1\u20133.","DOI":"10.1109\/MWSYM.2012.6258390"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"11790","DOI":"10.3390\/s120911790","article-title":"Alignment and position sensors based on split ring resonators","volume":"12","author":"Naqui","year":"2012","journal-title":"Sensors"},{"key":"ref_49","doi-asserted-by":"crossref","unstructured":"Naqui, J., Dur\u00e1n-Sindreu, M., and Mart\u00edn, F. (2013). Transmission lines loaded with bisymmetric resonators and applications. IEEE MTT-S Int. Microw. Symp. Digest, 1\u20133.","DOI":"10.1109\/MWSYM.2013.6697368"},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"1153","DOI":"10.1109\/JSEN.2012.2231065","article-title":"Displacement sensor based on diamond-shaped tapered split ring resonator","volume":"13","author":"Horestani","year":"2012","journal-title":"IEEE Sens. J."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"3014","DOI":"10.1109\/JSEN.2013.2264804","article-title":"Rotation sensor based on horn-shaped split ring resonator","volume":"13","author":"Horestani","year":"2013","journal-title":"IEEE Sens. J."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"4700","DOI":"10.1109\/TMTT.2013.2285356","article-title":"Transmission lines loaded with bisymmetric resonators and their application to angular displacement and velocity sensors","volume":"61","author":"Naqui","year":"2013","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"2609","DOI":"10.1109\/JSEN.2014.2313625","article-title":"Metamaterial-inspired rotation sensor with wide dynamic range","volume":"14","author":"Ebrahimi","year":"2014","journal-title":"IEEE Sens. J."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"620","DOI":"10.1049\/el.2014.0572","article-title":"Two-dimensional displacement and alignment sensor based on reflection coefficients of open microstrip lines loaded with split ring resonators","volume":"50","author":"Horestani","year":"2014","journal-title":"Electron. Lett."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"939","DOI":"10.1109\/JSEN.2013.2295518","article-title":"Angular displacement and velocity sensors based on electric-LC (ELC) loaded microstrip lines","volume":"14","author":"Naqui","year":"2013","journal-title":"IEEE Sens. J."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"9628","DOI":"10.3390\/s150509628","article-title":"Angular displacement and velocity sensors based on coplanar waveguides (CPWs) loaded with S-shaped split ring resonators (S-SRR)","volume":"15","author":"Naqui","year":"2015","journal-title":"Sensors"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"1854","DOI":"10.1002\/elps.201400524","article-title":"Differential microfluidic sensor on printed circuit board for biological cells analysis","volume":"36","author":"Shi","year":"2015","journal-title":"Electrophoresis"},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"48324","DOI":"10.1109\/ACCESS.2018.2867077","article-title":"Highly sensitive microwave sensors based on open complementary split ring resonators (OCSRRs) for dielectric characterization and solute concentration measurement in liquids","volume":"6","author":"Grenier","year":"2018","journal-title":"IEEE Access"},{"key":"ref_59","first-page":"2562","article-title":"Split ring resonator-based microwave fluidic sensors for electrolyte concentration measurements","volume":"19","author":"Grenier","year":"2018","journal-title":"IEEE Sens. J."},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"3189","DOI":"10.3390\/s19143189","article-title":"Differential microfluidic sensors based on dumbbell-shaped defect ground structures in microstrip technology: Analysis, optimization, and applications","volume":"19","author":"Gil","year":"2019","journal-title":"Sensors"},{"key":"ref_61","unstructured":"Mu\u00f1oz-Enano, J., V\u00e9lez, P., Gil, M., Mata-Contreras, J., and Mart\u00edn, F. (2019, January 13\u201315). Microwave comparator based on defect ground structures. Presented at the European Microwave Conference in Central Europe, Prague, Czech Republic."},{"key":"ref_62","doi-asserted-by":"crossref","unstructured":"V\u00e9lez, P., Mu\u00f1oz-Enano, J., and Mart\u00edn, F. (2019, January 1\u20133). Electrolyte concentration measurements in DI water with 0.125 g\/L resolution by means of CSRR-based structures. Proceedings of the 49th European Microwave Conference (EuMC), Paris, France.","DOI":"10.23919\/EuMC.2019.8910697"},{"key":"ref_63","doi-asserted-by":"crossref","unstructured":"Mu\u00f1oz-Enano, J., V\u00e9lez, P., Gil, M., Mata-Contreras, J., Grenier, K., Dubuc, D., and Mart\u00edn, F. (2019, January 1\u20133). Microstrip lines loaded with metamaterial-inspired resonators for microwave sensors\/comparators with optimized sensitivity. Proceedings of the 49th European Microwave Conference (EuMC), Paris, France.","DOI":"10.23919\/EuMC.2019.8910702"},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"1312","DOI":"10.1109\/TMTT.2019.2955676","article-title":"Differential-mode to common-mode conversion detector based on rat-race hybrid couplers: Analysis and application to differential sensors and comparators","volume":"68","year":"2020","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_65","doi-asserted-by":"crossref","unstructured":"Mu\u00f1oz-Enano, J., V\u00e9lez, P., Gil, M., and Mart\u00edn, F. (2020). Microfluidic reflective-mode differential sensor based on open split ring resonators (OSRRs). Int. J. Microw. Wirel. Technol., 1\u201310.","DOI":"10.1017\/S1759078720000501"},{"key":"ref_66","doi-asserted-by":"crossref","first-page":"1149","DOI":"10.1109\/LMWC.2018.2875996","article-title":"Transmission lines terminated with LC resonators for differential permittivity sensing","volume":"28","author":"Ebrahimi","year":"2018","journal-title":"IEEE Microw. Wirel. Components Lett."},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"690","DOI":"10.1109\/LMWC.2019.2939533","article-title":"Differential sensing based on quasi-microstrip mode to slot-mode conversion","volume":"29","year":"2019","journal-title":"IEEE Microw. Wirel. Components Lett."},{"key":"ref_68","doi-asserted-by":"crossref","unstructured":"Horestani, A.K., Shaterian, Z., and Mart\u00edn, F. (2020). Rotation sensor based on the cross-polarized excitation of split ring resonators (SRRs). IEEE Sens. J., 1.","DOI":"10.1109\/JSEN.2020.2990484"},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"1598","DOI":"10.1109\/TMTT.2019.2957369","article-title":"A highly sensitive planar microwave sensor for detecting direction and angle of rotation","volume":"68","author":"Jha","year":"2020","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_70","doi-asserted-by":"crossref","unstructured":"Mart\u00edn, F. (2015). Artificial Transmission Lines for RF and Microwave Applications, Wiley.","DOI":"10.1002\/9781119058403"},{"key":"ref_71","doi-asserted-by":"crossref","unstructured":"Ebrahimi, A., Beziuk, G., Scott, J., and Ghorbani, K. (2020). Microwave differential frequency splitting sensor using magnetic-LC resonators. Sensors, 20.","DOI":"10.3390\/s20041066"},{"key":"ref_72","doi-asserted-by":"crossref","unstructured":"Mansour, R., Rioual, S., Lescop, B., Talbot, P., Abboud, M., Farah, W., and Tann\u00e9, G. (2020). Development of a resonant microwave sensor for sediment density characterization. Sensors, 20.","DOI":"10.3390\/s20041058"},{"key":"ref_73","doi-asserted-by":"crossref","unstructured":"Hao, H., Wang, D., and Wang, Z. (2020). Design of substrate-integrated waveguide loading multiple complementary open resonant rings (CSRRs) for dielectric constant measurement. Sensors, 20.","DOI":"10.3390\/s20030857"},{"key":"ref_74","doi-asserted-by":"crossref","unstructured":"Oliveira, J.G.D., Pinto, E.N.M.G., Neto, V.P.S., and D\u2019Assun\u00e7\u00e3o, A.G. (2020). CSRR-based microwave sensor for dielectric materials characterization applied to soil water content determination. Sensors, 20.","DOI":"10.3390\/s20010255"},{"key":"ref_75","doi-asserted-by":"crossref","unstructured":"Wei, Z., Huang, J., Li, J., Li, J., Liu, X., and Ni, X. (2019). A compact double-folded substrate integrated waveguide re-entrant cavity for highly sensitive humidity sensing. 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