A 915 MHz wristwatch-integrated antenna for wireless health monitoring

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Kumar, Sanjeev
Buckley, John L.
Barton, John
Newberry, Robert
Dunlop, Gary
Rodencal, Matthew
Webster, Carlo
Pigeon, Melusine
Scanlon, William G.
O'Flynn, Brendan
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Institute of Electrical and Electronics Engineers (IEEE)
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A compact 915 MHz antenna integrated within a wristwatch wireless sensor device is presented. The antenna is a variant of a planar inverted-F antenna (PIFA) and uses a dual-resonator configuration. The results of simulation and measurement are shown to be in good agreement with the antenna exhibiting desirable impedance and radiation characteristics together with low Specific Absorption Rate (SAR) performance. The antenna is fabricated using a low cost flexible printed circuit and is fully integrated into the watch device. Measurements on the prototype antenna show a -10 dB impedance bandwidth of 30 MHz, a peak realized gain of -4.9 dBi and a peak radiation efficiency of 15.9% at 915 MHz. The antenna also has a low SAR value of 0.003 W/kg making it suitable for a wide range of wrist-worn wireless applications.
Antenna radiation patterns , Patient monitoring , Planar inverted-F antennas , Printed circuit manufacture , Resonators , Watches , Wearable antennas , PIFA , Wristwatch wireless sensor device , Wristwatch-integrated antenna , Low specific absorption rate performance , Peak radiation efficiency , Watch device , Low cost flexible printed circuit , Radiation characteristics , Dual-resonator configuration , Planar inverted-F antenna , Compact antenna , Wireless health monitoring , Wrist-worn wireless applications , Low SAR value , Frequency 915.0 MHz , Bandwidth 30.0 MHz , Antenna , Wearable , Sub-GHz , Wristwatch-integration , Clinical-trials
Kumar, S., Buckley, J. L., Barton, J., Newberry, R., Dunlop, G., Rodencal, M., Webster, C., Pigeon, M., Scanlon, W. G. and O’Flynn, B. (2020)'A 915 MHz Wristwatch-Integrated Antenna for Wireless Health Monitoring'. EuCAP 2020, 14th European Conference on Antennas and Propagation, Copenhagen, Denmark, 15-20 March. 2020. doi: 10.23919/EuCAP48036.2020.9135360
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