A 2.4-GHz vital-sign sensor for noncontact healthcare monitoring

Sen Wang, Yi-Huei Chen and Ren-Hua Chang

Journal of Electromagnetic Waves and Applications, 2016, vol. 30, issue 8, 1064-1074

Abstract: This paper presents a 2.4-GHz vital-sign sensor for noncontact healthcare monitoring applications. The sensor consists of one VCO, two circulators, three Wilkinson power dividers, one 90° hybrid, two mixers, and two active band-pass filters. The sensor with the injection-locked VCO and the I/Q demodulator reduces system complexity and avoids the null detection points, respectively. Moreover, the sensor achieves a long sensing distance without the need of a low-noise amplifier or a power amplifier. Under total power consumption of 17.8 mW, experimental results demonstrate that vital-sign signals including respiration and heartbeat can be identified and detected correctly up to 80 cm away from the subject. Moreover, the errors of heartbeats are less than 4.9% compared to a contact device.

Date: 2016
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DOI: 10.1080/09205071.2016.1172517

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