{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,16]],"date-time":"2026-04-16T22:26:58Z","timestamp":1776378418819,"version":"3.51.2"},"reference-count":45,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2020,9,17]],"date-time":"2020-09-17T00:00:00Z","timestamp":1600300800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"the Key Laboratory of Performance Evolution and Control for Engineering Structures (Tongji University)","award":["\/"],"award-info":[{"award-number":["\/"]}]},{"name":"the Ministry of Education of the People\u2019s Republic of China","award":["2018KF-4"],"award-info":[{"award-number":["2018KF-4"]}]},{"name":"the Fundamental Research Funds for the Central Universities","award":["\/"],"award-info":[{"award-number":["\/"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This paper presents a capacitive displacement sensor based on a capacitively fed inverted-F antenna (CFIFA) for displacement detection. The sensor is composed of a grounded L-shape patch and a rectangular upper patch, forming a capacitor between them. The asymmetric dipole model is adopted to explain the frequency shift and current distribution of the proposed antenna sensor at its first-order resonance. The numerical simulation of the CFIFA using the Ansoft high-frequency structure simulator (HFSS) software is carried out to optimize the dimensional parameters, allowing the antenna to perform better. Two sets of CFIFAs are fabricated and tested for verification. Results show that the CFIFA has a good linear relationship between its first resonant frequency and the relative displacement, and is capable of a long range of displacement measuring.<\/jats:p>","DOI":"10.3390\/s20185310","type":"journal-article","created":{"date-parts":[[2020,9,17]],"date-time":"2020-09-17T08:29:43Z","timestamp":1600331383000},"page":"5310","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["A Capacitively-Fed Inverted-F Antenna for Displacement Detection in Structural Health Monitoring"],"prefix":"10.3390","volume":"20","author":[{"given":"Songtao","family":"Xue","sequence":"first","affiliation":[{"name":"Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China"},{"name":"Department of Architecture, Tohoku Institute of Technology, Sendai 982-8577, Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6592-3960","authenticated-orcid":false,"given":"Zhiquan","family":"Zheng","sequence":"additional","affiliation":[{"name":"Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China"}]},{"given":"Shuai","family":"Guan","sequence":"additional","affiliation":[{"name":"Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5777-0645","authenticated-orcid":false,"given":"Liyu","family":"Xie","sequence":"additional","affiliation":[{"name":"Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China"}]},{"given":"Guochun","family":"Wan","sequence":"additional","affiliation":[{"name":"Department of Electronic Science and Technology, Tongji University, Shanghai 200092, China"}]},{"given":"Chunfeng","family":"Wan","sequence":"additional","affiliation":[{"name":"Key Laboratory of concrete and pre-stressed concrete structure of Ministry of Education, Southeast University, Nanjing 210096, China"}]}],"member":"1968","published-online":{"date-parts":[[2020,9,17]]},"reference":[{"key":"ref_1","first-page":"76480P","article-title":"SHM process as perceived through 350 projects","volume":"7648","author":"Glisic","year":"2010","journal-title":"Smart Sens. Phenom. Technol. Netw. Syst."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"789","DOI":"10.1007\/s11837-012-0370-9","article-title":"Structural health monitoring: State of the art and perspectives","volume":"64","author":"Liu","year":"2012","journal-title":"JOM"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"26","DOI":"10.1109\/MIC.2006.38","article-title":"Monitoring civil structures with a wireless sensor network","volume":"10","author":"Chintalapudi","year":"2006","journal-title":"IEEE Int. Comput."},{"key":"ref_4","first-page":"267","article-title":"Smart wireless sensor technology for structural health monitoring of civil structures","volume":"8","author":"Cho","year":"2008","journal-title":"Steel Struct."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"6767","DOI":"10.1109\/JSEN.2015.2457455","article-title":"Wireless Passive RFID Crack Width Sensor for Structural Health Monitoring","volume":"15","author":"Caizzone","year":"2015","journal-title":"IEEE Sens. J."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"5143","DOI":"10.1109\/JSEN.2018.2831903","article-title":"Reusable Passive Wireless RFID Sensor for Strain Measurement on Metals","volume":"18","author":"Chakaravarthi","year":"2018","journal-title":"IEEE Sens. J."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Dong, C.-Z., Celik, O., Catbas, F.N., OBrien, E., and Taylor, S. (2019). A Robust Vision-Based Method for Displacement Measurement under Adverse Environmental Factors Using Spatio-Temporal Context Learning and Taylor Approximation. Sensors, 19.","DOI":"10.20944\/preprints201906.0023.v1"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Dong, C.Z., and Catbas, F.N. (2020). A review of computer vision\u2013based structural health monitoring at local and global levels. Struct. Health Monit.","DOI":"10.1177\/1475921720935585"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Alshamaa, D., Mourad-Chehade, F., and Honein\u00e9, P. (2018, January 26\u201328). Localization of Sensors in Indoor Wireless Networks: An Observation Model Using WiFi RSS. Proceedings of the 9th IFIP International Conference on New Technologies, Mobility and Security (NTMS), Paris, France.","DOI":"10.1109\/NTMS.2018.8328699"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Jawad, H.M., Nordin, R., Gharghan, S.K., Jawad, A.M., and Ismail, M. (2017). Energy-Efficient Wireless Sensor Networks for Precision Agriculture: A Review. Sensors, 17.","DOI":"10.3390\/s17081781"},{"key":"ref_11","first-page":"166","article-title":"Automated irrigation system using a wireless sensor network and GPRS module","volume":"63","year":"2013","journal-title":"IEEE Trans. Instrum. Meas."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Kovacic, M., Vra\u017eic, M., and Ga\u0161parac, I. (2010, January 6\u20138). Bluetooth wireless communication and 1-wire digital temperature sensors in synchronous machine rotor temperature measurement. Proceedings of the 14th International Power Electronics and Motion Control Conference, Ohrid, Makedonija.","DOI":"10.1109\/EPEPEMC.2010.5606582"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"901","DOI":"10.1109\/TII.2018.2821129","article-title":"Fragmentation-Based Distributed Control System for Software-Defined Wireless Sensor Networks","volume":"15","author":"Kobo","year":"2019","journal-title":"IEEE Trans. Ind. Inform."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1644","DOI":"10.1109\/JPROC.2014.2361599","article-title":"Energy harvesting and scavenging","volume":"102","author":"Tentzeris","year":"2014","journal-title":"Proc. IEEE"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Zhang, J., Tian, G.Y., Marindra, A.M.J., Sunny, A.I., and Zhao, A.B. (2017). A review of passive RFID tag antenna-based sensors and systems for structural health monitoring applications. Sensors (Switzerland), 17.","DOI":"10.3390\/s17020265"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"112015","DOI":"10.1016\/j.sna.2020.112015","article-title":"Development of a wireless and passive temperature-compensated SAW strain sensor","volume":"308","author":"Wang","year":"2020","journal-title":"Sens. Actuators A Phys."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"095503","DOI":"10.1088\/0957-4484\/21\/9\/095503","article-title":"A passive wireless hydrogen surface acoustic wave sensor based on Pt-coated ZnO nanorods","volume":"21","author":"Huang","year":"2010","journal-title":"Nanotechnology"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"757","DOI":"10.1017\/S1759078716000751","article-title":"Development of compact inductive coupled meander line RFID tag for near-field applications","volume":"9","author":"Choudhary","year":"2016","journal-title":"Int. J. Microw. Wirel. Technol."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"609","DOI":"10.1109\/LED.2019.2899068","article-title":"Wireless battery-free SiC sensors operating in harsh environments using resonant inductive coupling","volume":"40","author":"Phan","year":"2019","journal-title":"IEEE Electron Device Lett."},{"key":"ref_20","unstructured":"Manoj, A.J.Y.D. (2017). Wireless Sensor System for Infrastructure Health Monitoring. [Ph.D. Thesis, Western Sydney University]."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Zaid, J., Abdulhadi, A.E., and Denidni, T.A. (2019). Miniaturized multi-port microstrip patch antenna using metamaterial for passive UHF RFID-tag sensor applications. Sensors, 19.","DOI":"10.3390\/s19091982"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1163","DOI":"10.1109\/TIM.2015.2507406","article-title":"Measurement System with Accelerometer Integrated RFID Tag for Infrastructure Health Monitoring","volume":"65","author":"Jayawardana","year":"2015","journal-title":"IEEE Trans. Instrum. Meas."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Xue, S., Jiang, K., Guan, S., Xie, L., Wan, G., and Wan, C. (2020). Long-Range Displacement Meters Based on Chipped Circular Patch Antenna. Sensors, 20.","DOI":"10.3390\/s20174884"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"4699","DOI":"10.1109\/JSEN.2017.2712190","article-title":"An Inkjet Printed Chipless RFID Sensor for Wireless Humidity Monitoring","volume":"17","author":"Borgese","year":"2017","journal-title":"IEEE Sens. J."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"3623","DOI":"10.1109\/TMTT.2012.2213838","article-title":"Passive wireless temperature sensor based on time-coded UWB chipless RFID tags","volume":"60","author":"Girbau","year":"2012","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Chen, Z.N. (2016). Antenna sensors in passive wireless sensing systems. Handbook of Antenna Technologies, Springer. [1st ed.].","DOI":"10.1007\/978-981-4560-44-3_91"},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Xue, S., Yi, Z., Xie, L., Wan, G., and Ding, T. (2019). A displacement sensor based on a normal mode helical antenna. Sensors, 19.","DOI":"10.3390\/s19173767"},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Donelli, M. (2018). An RFID-based sensor for masonry crack monitoring. Sensors, 18.","DOI":"10.3390\/s18124485"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"169","DOI":"10.1177\/1045389X11432655","article-title":"Utilising microstrip patch antenna strain sensors for structural health monitoring","volume":"23","author":"Daliri","year":"2012","journal-title":"J. Intell. Mater. Syst. Struct."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"085009","DOI":"10.1088\/0964-1726\/22\/8\/085009","article-title":"Passive wireless antenna sensor for strain and crack sensing\u2014Electromagnetic modeling, simulation, and testing","volume":"22","author":"Yi","year":"2013","journal-title":"Smart Mater. Struct."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"6147","DOI":"10.1109\/JSEN.2015.2453947","article-title":"Sensitivity modeling of an RFID-based strain-sensing antenna with dielectric constant change","volume":"15","author":"Yi","year":"2015","journal-title":"IEEE Sens. J."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"22","DOI":"10.1007\/s10921-018-0475-3","article-title":"A Novel RFID-Based Strain Sensor for Wireless Structural Health Monitoring","volume":"37","author":"Kuhn","year":"2018","journal-title":"J. Nondestruct. Eval."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"085012","DOI":"10.1088\/1361-665X\/ab2834","article-title":"Crack sensor based on patch antenna fed by capacitive microstrip lines","volume":"28","author":"Xue","year":"2019","journal-title":"Smart Mater. Struct."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Xue, S., Yi, Z., Xie, L., Wan, G., and Ding, T. (2019). A passive wireless crack sensor based on patch antenna with overlapping sub-patch. Sensors, 19.","DOI":"10.3390\/s19194327"},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Guan, S., Xie, L., Xue, S., and Wan, G. (2019, January 20\u201322). Displacement Sensor Based on Separated Inverted-F Antenna. Proceedings of the 2019 IEEE International Conference on Computational Electromagnetics, Shanghai, China.","DOI":"10.1109\/COMPEM.2019.8778926"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1109\/74.997891","article-title":"Analysis and Design of an Inverted-F Antenna Printed on a PCMCIA Card for the 2.4 GHz ISM Band","volume":"44","author":"Soras","year":"2002","journal-title":"IEEE Antennas Propag. Mag."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1648","DOI":"10.1109\/8.362807","article-title":"Study of the Capacitively Fed Microstrip Antenna Element","volume":"42","author":"Vandenbosch","year":"1994","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"837","DOI":"10.1109\/8.575634","article-title":"A capacitively loaded PIFA for compact mobile telephone handsets","volume":"45","author":"Rowell","year":"2002","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"470","DOI":"10.1002\/mop.20504","article-title":"A microstrip-coupled printed inverted-f monopole antenna","volume":"43","author":"Su","year":"2004","journal-title":"Microw. Opt. Technol. Lett."},{"key":"ref_40","first-page":"28","article-title":"Design of integrated inverted F antennas made of asymmetrical coplanar striplines","volume":"14","author":"Hui","year":"2002","journal-title":"Appl. Microw. Wirel."},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Waterhouse, R. (2007). Small multiband printed monopole antennas. Printed Antennas for Wireless Communications, John Wiley & Sons, Ltd.. [1st ed.].","DOI":"10.1002\/9780470512241"},{"key":"ref_42","doi-asserted-by":"crossref","unstructured":"Zhuoran, Y., Songtao, X., Liyu, X., and Wan, G.C. (2019, January 20\u201322). Design and Numerical Simulation of Displacement Sensor Based on Liquid Antenna. Proceedings of the 2019 IEEE International Conference on Computational Electromagnetics, Shanghai, China.","DOI":"10.1109\/COMPEM.2019.8779122"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"1691","DOI":"10.3390\/s140101691","article-title":"Wireless displacement sensing enabled by metamaterial probes for remote structural health monitoring","volume":"14","author":"Ozbey","year":"2014","journal-title":"Sensors"},{"key":"ref_44","unstructured":"Mandel, C., Kubina, B., Schusler, M., and Jakoby, R. (2011, January 9\u201314). Passive chipless wireless sensor for two-dimensional displacement measurement. Proceedings of the European Microwave Week 2011: \u201cWave to the Future\u201d, EuMW 2011, Manchester, UK."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"1353","DOI":"10.1109\/TLA.2018.8408427","article-title":"Passive Wireless Sensor for Displacement Monitoring in Metal Structures","volume":"16","author":"Kuhn","year":"2018","journal-title":"IEEE Lat. Am. 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