{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T19:16:14Z","timestamp":1773947774436,"version":"3.50.1"},"reference-count":37,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2017,5,6]],"date-time":"2017-05-06T00:00:00Z","timestamp":1494028800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this paper, we report on a novel sensor for the contactless monitoring of the respiration rate, made from multi-material fibers arranged in the form of spiral antenna (2.45 GHz central frequency). High flexibility of the used composite metal-glass-polymer fibers permits their integration into a cotton t-shirt without compromising comfort or restricting movement of the user. At the same time, change of the antenna geometry, due to the chest expansion and the displacement of the air volume in the lungs, is found to cause a significant shift of the antenna operational frequency, thus allowing respiration detection. In contrast with many current solutions, respiration is detected without attachment of the electrodes of any kind to the user\u2019s body, neither direct contact of the fiber with the skin is required. Respiration patterns for two male volunteers were recorded with the help of a sensor prototype integrated into standard cotton t-shirt in sitting, standing, and lying scenarios. The typical measured frequency shift for the deep and shallow breathing was found to be in the range 120\u2013200 MHz and 10\u201315 MHz, respectively. The same spiral fiber antenna is also shown to be suitable for short-range wireless communication, thus allowing respiration data transmission, for example, via the Bluetooth protocol, to mobile handheld devices.<\/jats:p>","DOI":"10.3390\/s17051050","type":"journal-article","created":{"date-parts":[[2017,5,8]],"date-time":"2017-05-08T11:45:16Z","timestamp":1494243916000},"page":"1050","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":50,"title":["Wearable Contactless Respiration Sensor Based on Multi-Material Fibers Integrated into Textile"],"prefix":"10.3390","volume":"17","author":[{"given":"Philippe","family":"Guay","sequence":"first","affiliation":[{"name":"Center for Optics, Photonics and Lasers (COPL), Department of Physics, Universit\u00e9 Laval, Qu\u00e9bec, QC G1V 0A6, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3053-3356","authenticated-orcid":false,"given":"Stepan","family":"Gorgutsa","sequence":"additional","affiliation":[{"name":"Center for Optics, Photonics and Lasers (COPL), Department of Physics, Universit\u00e9 Laval, Qu\u00e9bec, QC G1V 0A6, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sophie","family":"LaRochelle","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, Universit\u00e9 Laval, Qu\u00e9bec, QC G1V 0A6, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Younes","family":"Messaddeq","sequence":"additional","affiliation":[{"name":"Center for Optics, Photonics and Lasers (COPL), Department of Physics, Universit\u00e9 Laval, Qu\u00e9bec, QC G1V 0A6, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2017,5,6]]},"reference":[{"key":"ref_1","unstructured":"Sasan, A. (2015). Ubiquitous Health Monitoring: Integration of Wearable Sensors, Novel Sensing Techniques, and Body Sensor Networks. Mobile Health, Springer International Publishing."},{"key":"ref_2","first-page":"1","article-title":"A Review of Wearable Sensors and Systems with Application in Rehabilitation","volume":"9","author":"Shyamal","year":"2012","journal-title":"J. NeuroEng. Rehabil."},{"key":"ref_3","unstructured":"Kay, M., Santos, J., and Takane, M. (2011). Mhealth: New Horizons for Health through Mobile Technologies, World Health Organization."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1934","DOI":"10.1109\/TBME.2012.2194145","article-title":"Monitoring Respiration and Cardiac Activity Using Fiber Bragg Grating-Based Sensor","volume":"59","author":"Dziuda","year":"2012","journal-title":"IEEE Trans. Biomed. Eng."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Guo, L., Berglin, L., Li, Y.J., Mattila, H., Mehrjerdi, A.K., and Skrifvars, M. (2011, January 30\u201331). Disappearing Sensor'-Textile Based Sensor for Monitoring Breathing. Proceedings of the 2011 International Conference on Control, Automation and Systems Engineering (CASE), Singapore.","DOI":"10.1109\/ICCASE.2011.5997723"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"439","DOI":"10.1378\/chest.62.4.439","article-title":"Impedance Pneumography: Comparison between Chest Impedance Changes and Respiratory Volumes in 11 Healthy Volunteers","volume":"62","author":"Grenvik","year":"1972","journal-title":"Chest"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"524","DOI":"10.1136\/emj.20.6.524","article-title":"Standard Pulse Oximeters Can Be Used to Monitor Respiratory Rate","volume":"20","author":"Leonard","year":"2003","journal-title":"Emerg. Med. J."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"890","DOI":"10.1109\/TITB.2009.2031239","article-title":"Automatic Detection of Respiration Rate from Ambulatory Single-Lead Ecg","volume":"13","author":"Boyle","year":"2009","journal-title":"IEEE Trans. Inf. Technol. Biomed."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"265","DOI":"10.2528\/PIER09120302","article-title":"Analysis of Vital Signs Monitoring Using an Ir-Uwb Radar","volume":"100","author":"Lazaro","year":"2010","journal-title":"Prog. Electromagn. Res. B"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"372","DOI":"10.1109\/TITB.2005.854510","article-title":"Strain Sensing Fabric for Hand Posture and Gesture Monitoring","volume":"9","author":"Lorussi","year":"2005","journal-title":"IEEE Trans. Inf. Technol. Biomed."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Yang, C.M., Wu, C.C., Chou, C.M., and Yang, T.L. (2009, January 4\u20137). Vehicle Driver\u2019s Ecg and Sitting Posture Monitoring System. Proceedings of the 9th International Conference on Information Technology and Applications in Biomedicine, Larnaca, Cyprus.","DOI":"10.1109\/ITAB.2009.5394321"},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Cheng, J., Amft, O., and Lukowicz, P. (2010). Active Capacitive Sensing: Exploring a New Wearable Sensing Modality for Activity Recognition. Proceedings of the 8th International Conference on Pervasive Computing, Springer.","DOI":"10.1007\/978-3-642-12654-3_19"},{"key":"ref_13","unstructured":"Steffen, L., Thomas, F., and Petri, M. (2007). Contactless Emg Sensors Embroidered onto Textile. 4th International Workshop on Wearable and Implantable Body Sensor Networks (Bsn 2007), Springer."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Chi, Y.M., and Cauwenberghs, G. (2010, January 7\u20139). Wireless Non-Contact Eeg\/Ecg Electrodes for Body Sensor Networks. Proceedings of the 2010 International Conference on Body Sensor Networks (BSN), Singapore.","DOI":"10.1109\/BSN.2010.52"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1553","DOI":"10.1002\/mop.29131","article-title":"Design and Performance of Wearable Ultrawide Band Textile Antenna for Medical Applications","volume":"57","author":"Singh","year":"2015","journal-title":"Microwav. Opt. Technol. Lett."},{"key":"ref_16","unstructured":"Kumar, G., and Ray, K.P. (2003). Broadband Microstrip Antennas, Artech House."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Huang, C.T., Tang, C.F., and Shen, C. (2006, January 11\u201314). A Wearable Textile for Monitoring Respiration, Using a Yarn-Based Sensor. Proceedings of the 2006 10th IEEE International Symposium on Wearable Computers, Montreux, Switzerland.","DOI":"10.1109\/ISWC.2006.286366"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1690","DOI":"10.1109\/LAWP.2013.2239956","article-title":"Textile Antennas and Sensors for Body-Worn Applications","volume":"11","author":"Lanlin","year":"2012","journal-title":"Antennas Wirel. Propag. Lett. IEEE"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"3872","DOI":"10.1002\/adma.200700177","article-title":"Multimaterial Photodetecting Fibers: A Geometric and Structural Study","volume":"19","author":"Sorin","year":"2007","journal-title":"Adv. Mater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"643","DOI":"10.1038\/nmat2792","article-title":"Multimaterial Piezoelectric Fibres","volume":"9","author":"Egusa","year":"2010","journal-title":"Nat. Mater."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1600032","DOI":"10.1002\/admt.201600032","article-title":"User-Interactive and Wireless-Communicating RF Textiles","volume":"1","author":"Gorgutsa","year":"2016","journal-title":"Adv. Mater. Technol."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"2457","DOI":"10.1109\/TAP.2016.2546959","article-title":"Emissive Properties of Wearable Wireless-Communicating Textiles Made from Multimaterial Fibers","volume":"64","author":"Gorgutsa","year":"2016","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"224","DOI":"10.1016\/j.pcad.2013.08.006","article-title":"Ecg Patch Monitors for Assessment of Cardiac Rhythm Abnormalities","volume":"56","author":"Lobodzinski","year":"2013","journal-title":"Prog. Cardiovasc. Dis."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"390","DOI":"10.1016\/j.snb.2009.04.040","article-title":"Wireless Sensor Network Based Wearable Smart Shirt for Ubiquitous Health and Activity Monitoring","volume":"140","author":"Lee","year":"2009","journal-title":"Sens. Actuators B Chem."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"487","DOI":"10.1542\/pir.31.12.487","article-title":"Newborn Respiratory Disorders","volume":"31","author":"Warren","year":"2010","journal-title":"Pediatr. Rev."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Hulbert, D. (2009). Get through Mcem Part A: Mcqs, CRC Press.","DOI":"10.1201\/b13294"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1136\/ard.31.1.1","article-title":"An Objective Clinical Study of Chest Expansion","volume":"31","author":"Moll","year":"1972","journal-title":"Ann. Rheum. Dis."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"675","DOI":"10.3184\/174751911X13206824040536","article-title":"The Mechanism of the Reaction of the Tollen Reagent","volume":"35","author":"Benet","year":"2011","journal-title":"J. Chem. Res."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"873","DOI":"10.1063\/1.1697561","article-title":"A Computational Method Applicable to Microwave Networks","volume":"18","author":"Dicke","year":"1947","journal-title":"J. Appl. Phys."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1119\/1.4755780","article-title":"Radiometry and the Friis Transmission Equation","volume":"81","author":"Shaw","year":"2013","journal-title":"Am. J. Phys."},{"key":"ref_31","unstructured":"Camelia, G., and Sami, G. (1998). Compilation of the Dielectric Properties of Body Tissues at Rf and Microwave Frequencies, Brooks Air Force Base, Texas, Armstrong Laboratory (AFMC), Occupational and Environmental Health Directorate, Radiofrequency Radiation Division."},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Ida, N. (2015). Engineering Electromagnetics, Springer International Publishing.","DOI":"10.1007\/978-3-319-07806-9"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"216","DOI":"10.1109\/TAP.1963.1138043","article-title":"Effects of a Surrounding Conducting Medium on Antenna Analysis","volume":"11","author":"Moore","year":"1963","journal-title":"Antennas Propag. IEEE Trans."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"1934","DOI":"10.1109\/TMTT.2004.832018","article-title":"Implanted Antennas inside a Human Body: Simulations, Designs, and Characterizations","volume":"52","author":"Jaehoon","year":"2004","journal-title":"Microw. Theory Tech. IEEE Trans."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Ito, K. (2007, January 11\u201316). Human Body Phantoms for Evaluation of Wearable and Implantable Antennas. Proceedings of the Second European Conference on Antennas and Propagation, EuCAP 2007, Edinburgh, UK.","DOI":"10.1049\/ic.2007.1117"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"1001","DOI":"10.1109\/TMTT.2008.919373","article-title":"Design of a Dual-Band Implantable Antenna and Development of Skin Mimicking Gels for Continuous Glucose Monitoring","volume":"56","author":"Karacolak","year":"2008","journal-title":"Microw. Theory Tech. IEEE Trans."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"378","DOI":"10.1097\/HP.0b013e31823a13f1","article-title":"Linear Dimensions and Volumes of Human Lungs Obtained from Ct Images","volume":"102","author":"Kramer","year":"2012","journal-title":"Health Phys."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/17\/5\/1050\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T18:34:52Z","timestamp":1760207692000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/17\/5\/1050"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2017,5,6]]},"references-count":37,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2017,5]]}},"alternative-id":["s17051050"],"URL":"https:\/\/doi.org\/10.3390\/s17051050","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2017,5,6]]}}}