Flexible Non-Constrained RF Wrist Pulse Detection Sensor Based on Array Resonators

Yong Jun An, Byung Hyun Kim, Gi Ho Yun, Sung Woo Kim, Seung Bum Hong, Jong Gwan Yook

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


This paper presents the development of a non-contact, nonintrusive wrist pulse sensor based on the near-field variation of an array resonator. A compact resonator and its array were designed and fabricated on flexible substrate. The reflection coefficient of the resonator can vary as a function of the distance between the resonator and the walls of the major arteries, and the corresponding variation is utilized to obtain heart rate information at the wrist. To detect very weak pulse signals from the main arteries, a sensitivity enhancement technique was devised using a radio frequency (RF) array resonator. The sensor system was implemented with an RF switch to combine or select appropriate signals from the resonator element and was tested using the 2.4 GHz ISM band. The results demonstrated the sensor system's excellent performance in both sequential and simultaneous detection schemes. The measurement results showed that a heartbeat pulse can be detected from both radial and ulnar arteries via the array resonators. Considering the high sensitivity and characteristics, the proposed detection system can be utilized as a wearable, long-term health monitoring device.

Original languageEnglish
Article number7103364
Pages (from-to)300-308
Number of pages9
JournalIEEE Transactions on Biomedical Circuits and Systems
Issue number2
Publication statusPublished - 2016 Apr

Bibliographical note

Publisher Copyright:
© 2015 IEEE.

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering
  • Electrical and Electronic Engineering


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