@inproceedings{e7b95179b029401b9b293746d83625a3,
title = "A Metasurface-based Wearable Antenna with Enhanced Directivity for Heart Rate Variability Monitoring",
abstract = "This paper presents a 5.8 GHz wearable rectangular ring antenna (RRA) with a metasurface that is constructed by a square split-ring resonator (SSRR) with an overlay square loop. The metasurface increases the directivity of the RRA to improve the sensing sensitivity of a bistatic self-injection-locked (SIL) Doppler radar for monitoring heart rate variability (HRV). The radar with the proposed antenna was first tested to detect a periodic movement of a copper plate and confirm a 77% improvement in detection amplitude due to the use of the metasurface. Then it was worn on the chest of a subject to measure his HRV. The extracted interbeat interval (IBI) from the radar measurements was compared to the electrocardiogram (ECG) results, showing a strong agreement with an average percentage root mean square error (PRMSE) of 6.26% or an average mean absolute percentage error (MAPE) of 3.90% throughout the experiments with different subjects.",
keywords = "Heart rate variability (HRV), metasurface, self-injection-locked (SIL) Doppler radar, wearable antenna",
author = "Acodili, {Mark Lester} and Arif, {Rezki El} and Horng, {Tzyy Sheng}",
note = "Publisher Copyright: {\textcopyright} 2022 The Institute of Electronics Information and Communication Engineers (IEICE) of Japan.; 2022 Asia-Pacific Microwave Conference, APMC 2022 ; Conference date: 29-11-2022 Through 02-12-2022",
year = "2022",
language = "English",
series = "Asia-Pacific Microwave Conference Proceedings, APMC",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "40--42",
booktitle = "2022 Asia-Pacific Microwave Conference, APMC 2022 - Proceedings",
address = "United States",
}