A wristwatch-based wireless sensor platform for IoT health monitoring applications
Kumar, Sanjeev; Buckley, John L.; Barton, John; Pigeon, Melusine; Newberry, Robert; Rodencal, Matthew; Hajzeraj, Adhurim; Hannon, Tim; Rogers, Ken; Casey, Declan; O'Sullivan, Donal; O'Flynn, Brendan
Date:
2020-03-16
Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Citation:
Kumar, S., Buckley, J. L., Barton, J., Pigeon, M., Newberry, R., Rodencal, M., Hajzeraj, A., Hannon, T., Rogers, K., Casey, D., O'Sullivan, D. and O'Flynn, B. (2020) 'A Wristwatch-Based Wireless Sensor Platform for IoT Health Monitoring Applications', Sensors, 20(6), 1675, (25 pp.), doi: 10.3390/s20061675
Abstract:
A wristwatch-based wireless sensor platform for IoT wearable health monitoring applications is presented. The paper describes the platform in detail, with a particular focus given to the design of a novel and compact wireless sub-system for 868 MHz wristwatch applications. An example application using the developed platform is discussed for arterial oxygen saturation (SpO2) and heart rate measurement using optical photoplethysmography (PPG). A comparison of the wireless performance in the 868 MHz and the 2.45 GHz bands is performed. Another contribution of this work is the development of a highly integrated 868 MHz antenna. The antenna structure is printed on the surface of a wristwatch enclosure using laser direct structuring (LDS) technology. At 868 MHz, a low specific absorption rate (SAR) of less than 0.1% of the maximum permissible limit in the simulation is demonstrated. The measured on-body prototype antenna exhibits a −10 dB impedance bandwidth of 36 MHz, a peak realized gain of −4.86 dBi and a radiation efficiency of 14.53% at 868 MHz. To evaluate the performance of the developed 868 MHz sensor platform, the wireless communication range measurements are performed in an indoor environment and compared with a commercial Bluetooth wristwatch device.
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Except where otherwise noted, this item's license is described as © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).