{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,29]],"date-time":"2026-07-29T11:03:55Z","timestamp":1785323035709,"version":"3.55.0"},"reference-count":31,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2022,8,25]],"date-time":"2022-08-25T00:00:00Z","timestamp":1661385600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Henan Science and Technology Commission Key Program","award":["212102210218"],"award-info":[{"award-number":["212102210218"]}]},{"name":"Henan Science and Technology Commission Key Program","award":["202102210316"],"award-info":[{"award-number":["202102210316"]}]},{"name":"Henan Science and Technology Commission Key Program","award":["22A510007"],"award-info":[{"award-number":["22A510007"]}]},{"name":"Henan Science and Technology Commission Key Program","award":["22A430025"],"award-info":[{"award-number":["22A430025"]}]},{"name":"Program of Higher Education of Henan Province","award":["212102210218"],"award-info":[{"award-number":["212102210218"]}]},{"name":"Program of Higher Education of Henan Province","award":["202102210316"],"award-info":[{"award-number":["202102210316"]}]},{"name":"Program of Higher Education of Henan Province","award":["22A510007"],"award-info":[{"award-number":["22A510007"]}]},{"name":"Program of Higher Education of Henan Province","award":["22A430025"],"award-info":[{"award-number":["22A430025"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this paper, we present a new microfluidic microwave sensor loaded with a star-slotted patch for detecting the quality of edible oil. The relative dielectric permittivity and the quality of edible oil will change after being heated at a high temperature. Therefore, the quality of edible oil can be detected by measuring the relative dielectric permittivity of edible oil. The sensor is used to determine the edible oil with different dielectric permittivity by measuring the resonance frequency offset of the input reflection coefficient, which operates at 2.68 GHz. This sensor is designed based on a resonant approach to provide the best sensing accuracy and is implemented using a substrate integrated waveguide structure combined with a pentagonal slot antenna operating at 2.3~2.9 GHz. It can detect greasy liquids with the real part of the complex permittivity ranging from two to three.<\/jats:p>","DOI":"10.3390\/s22176410","type":"journal-article","created":{"date-parts":[[2022,8,30]],"date-time":"2022-08-30T01:37:55Z","timestamp":1661823475000},"page":"6410","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Microfluidic Microwave Sensor Loaded with Star-Slotted Patch for Edible Oil Quality Inspection"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3120-7309","authenticated-orcid":false,"given":"Xueyun","family":"Han","sequence":"first","affiliation":[{"name":"College of Electronics and Electrical Engineering, Henan Normal University, Xinxiang 453000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yingping","family":"Zhou","sequence":"additional","affiliation":[{"name":"College of Electronics and Electrical Engineering, Henan Normal University, Xinxiang 453000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaosong","family":"Li","sequence":"additional","affiliation":[{"name":"College of Electronics and Electrical Engineering, Henan Normal University, Xinxiang 453000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhongjun","family":"Ma","sequence":"additional","affiliation":[{"name":"School of Environment, Henan Normal University, Xinxiang 453000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lei","family":"Qiao","sequence":"additional","affiliation":[{"name":"College of Electronics and Electrical Engineering, Henan Normal University, Xinxiang 453000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenghao","family":"Fu","sequence":"additional","affiliation":[{"name":"College of Electronics and Electrical Engineering, Henan Normal University, Xinxiang 453000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peidong","family":"Peng","sequence":"additional","affiliation":[{"name":"College of Electronics and Electrical Engineering, Henan Normal University, Xinxiang 453000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,8,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"\u0160egatin, N., \u017dontar, T.P., and Ulrih, N.P. (2020). Dielectric Properties and Dipole Moment of Edible Oils Subjected to \u2018Frying\u2019 Thermal Treatment. Foods, 9.","DOI":"10.3390\/foods9070900"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"26457","DOI":"10.3390\/s151026457","article-title":"Sensor and Methodology for Dielectric Analysis of Vegetal Oils Submitted to Thermal Stress","volume":"15","author":"Stevan","year":"2015","journal-title":"Sensors"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"571","DOI":"10.1007\/s13197-018-3511-5","article-title":"Modelling, characterization and quality analysis of heated oil using electric moment and chemical properties","volume":"56","author":"Valantina","year":"2019","journal-title":"J. Food Sci. Technol."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.tifs.2021.04.026","article-title":"Measurement of dielectric constant: A recent trend in quality analysis of vegetable oil-A review","volume":"113","author":"Valantina","year":"2021","journal-title":"Trends Food Sci. Technol."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"11355","DOI":"10.1021\/jf402943b","article-title":"Correlation of basic oil quality indices and electrical properties of model vegetable oil systems","volume":"61","author":"Prevc","year":"2013","journal-title":"J. Agric. Food Chem."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"136","DOI":"10.1016\/j.molliq.2017.04.107","article-title":"Estimation of dielectric constant of oil solution in the quality analysis of heated veg-etable oil","volume":"238","author":"Valantina","year":"2017","journal-title":"J. Mol. Liq."},{"key":"ref_7","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":"2012","journal-title":"Sens. Actuators A Phys."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Yeo, J., and Lee, J.-I. (2019). Slot-Loaded Microstrip Patch Sensor Antenna for High-Sensitivity Permittivity Characterization. Electronics, 8.","DOI":"10.3390\/electronics8050502"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Yeo, J., and Lee, J.I. (2019). Meander-Line Slot-Loaded High-Sensitivity Microstrip Patch Sensor Antenna for Relative Permittivity Measurement. Sensors, 19.","DOI":"10.3390\/s19214660"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"2941","DOI":"10.3390\/s17122941","article-title":"Microstrip Patch Sensor for Salinity Determination","volume":"17","author":"Kibae","year":"2017","journal-title":"Sensors"},{"key":"ref_11","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":"2013","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_12","first-page":"48","article-title":"Design of single -frequency circular microstrip patch antenna","volume":"38","author":"Jian","year":"2015","journal-title":"Mod. Electron. Tech."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"3218","DOI":"10.1109\/TAP.2016.2559581","article-title":"Microfluidic Eighth-Mode Substrate-Integrated-Waveguide Antenna for Compact Ethanol Chemical Sensor Application","volume":"64","author":"Seo","year":"2016","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"2749","DOI":"10.1002\/adma.200904201","article-title":"Stretchable Microfluidic Radiofrequency Antennas","volume":"22","author":"Kubo","year":"2010","journal-title":"Adv. Mater."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"3230","DOI":"10.1002\/smll.201300070","article-title":"A Tunable Spherical Cap Microfluidic Electrically Small Antenna","volume":"9","author":"Jobs","year":"2013","journal-title":"Small"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"9675847","DOI":"10.1155\/2020\/9675847","article-title":"Microfluidic Flexible Substrate Integrated Microstrip Antenna Sensor for Sensing of Moisture Content in Lubricating Oil","volume":"2020","author":"Zhu","year":"2020","journal-title":"Int. J. Antennas Propag."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"7275","DOI":"10.1007\/s11664-021-09251-6","article-title":"An Ultrathin Microwave Metamaterial Absorber for C, X, and Ku Band Applications","volume":"50","author":"Elakkiya","year":"2021","journal-title":"J. Electron. Mater."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1796","DOI":"10.1109\/TAP.2012.2186235","article-title":"Circular Beam-Steering Reconfigurable Antenna with Liquid Metal Parasitics","volume":"60","author":"Rodrigo","year":"2012","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"4714","DOI":"10.1109\/TMTT.2013.2287478","article-title":"An Inkjet-Printed Microfluidic RFID-Enabled Platform for Wireless Lab-on-Chip Applications","volume":"61","author":"Cook","year":"2013","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Lee, M., and Lim, S. (2018). Planar Inverted-F Antenna (PIFA) Using Microfluidic Impedance Tuner. Sensors, 18.","DOI":"10.3390\/s18103176"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"154061","DOI":"10.1016\/j.aeue.2021.154061","article-title":"Simple wideband extended aperture antenna-inspired circular patch for V-band com-munication systems","volume":"144","author":"Hussain","year":"2022","journal-title":"AEU-Int. J. Electron. Commun."},{"key":"ref_22","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_23","doi-asserted-by":"crossref","first-page":"107805","DOI":"10.1016\/j.measurement.2020.107805","article-title":"Dual-sensing and dual-frequency microwave SRR sensor for liquid samples permittivity detection","volume":"160","author":"Kiani","year":"2020","journal-title":"Measurement"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"13230","DOI":"10.1109\/JSEN.2021.3067933","article-title":"Submersible High Sensitivity Microwave Sensor for Edible Oil Detection and Quality Analysis","volume":"21","author":"Zhang","year":"2021","journal-title":"IEEE Sens. J."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"113275","DOI":"10.1016\/j.sna.2021.113275","article-title":"A dual-mode microwave sensor for edible oil characterization using magnetic-LC Resonators","volume":"333","author":"Zhang","year":"2022","journal-title":"Sens. Actuators A Phys."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1843","DOI":"10.1109\/TMTT.2018.2791942","article-title":"Strongly enhanced sensitivity in planar microwave sensors based on met-amaterial coupling","volume":"66","author":"Abdolrazzaghi","year":"2018","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_27","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":"Velez","year":"2017","journal-title":"IEEE Sens. J."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"232906","DOI":"10.1063\/1.4953465","article-title":"Wide dynamic range microwave planar coupled ring resonator for sensing applications","volume":"108","author":"Zarifi","year":"2016","journal-title":"Appl. Phys. Lett."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"385","DOI":"10.1007\/s11664-019-07761-y","article-title":"Dual-band microwave sensor for investigation of liquid impurity concentration using a met-amaterial complementary split-ring resonator","volume":"49","author":"Khanna","year":"2020","journal-title":"J. Electron. Mater."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Abdulkarim, Y., Deng, L., Karaaslan, M., Alt\u0131nta\u015f, O., Awl, H., Muhammadsharif, F., Liao, C., Unal, E., and Luo, H. (2020). Novel Metamaterials-Based Hypersensitized Liquid Sensor Integrating Omega-Shaped Resonator with Microstrip Transmission Line. Sensors, 20.","DOI":"10.3390\/s20030943"},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Su, L., Mata-Contreras, J., V\u00e9lez, P., and Mart\u00edn, F. (2016). Configurations of Splitter\/Combiner Microstrip Sections Loaded with Stepped Impedance Resonators (SIRs) for Sensing Applications. Sensors, 16.","DOI":"10.3390\/s16122195"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/17\/6410\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T00:15:13Z","timestamp":1760141713000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/17\/6410"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,8,25]]},"references-count":31,"journal-issue":{"issue":"17","published-online":{"date-parts":[[2022,9]]}},"alternative-id":["s22176410"],"URL":"https:\/\/doi.org\/10.3390\/s22176410","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,8,25]]}}}