A Metasurface-based Wearable Antenna with Enhanced Directivity for Heart Rate Variability Monitoring

Mark Lester Acodili, Rezki El Arif, Tzyy Sheng Horng

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.

Original languageEnglish
Title of host publication2022 Asia-Pacific Microwave Conference, APMC 2022 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages40-42
Number of pages3
ISBN (Electronic)9784902339567
Publication statusPublished - 2022
Externally publishedYes
Event2022 Asia-Pacific Microwave Conference, APMC 2022 - Yokohama, Japan
Duration: 29 Nov 20222 Dec 2022

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC
Volume2022-November

Conference

Conference2022 Asia-Pacific Microwave Conference, APMC 2022
Country/TerritoryJapan
CityYokohama
Period29/11/222/12/22

Keywords

  • Heart rate variability (HRV)
  • metasurface
  • self-injection-locked (SIL) Doppler radar
  • wearable antenna

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