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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
Kumar, Sanjeev
Buckley, John L
Barton, John
Pigeon, Melusine
Newberry, Robert
Rodencal, Matthew
Hajzeraj, Adhurim
Hannon, Tim
Rogers, Ken
Casey, Declan
Advisors
Editors
Other Contributors
Departments
Date
17/03/2020
Date Submitted
Keywords
IoT
LDS
PPG
Sub-GHz
bandwidth enhancement
electrically small antennas
HEALTHCARE
wearables
wireless sensor
wristwatch antenna
LDS
PPG
Sub-GHz
bandwidth enhancement
electrically small antennas
HEALTHCARE
wearables
wireless sensor
wristwatch antenna
Other Subjects
Subject Mesh
Planned Date
Start Date
Collaborators
Principal Investigators
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sensors-20-01675-v2.pdf
Adobe PDF, 7.56 MB
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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.
Language
en
Citation
ISSN
eISSN
1424-8220
ISBN
DOI
10.3390/s20061675
PMID
32192204