Wrist pulse detection system based on changes in the near-field reflection coefficient of a resonator

Yong Jun An, Gi Ho Yun, Sung Woo Kim, Jong Gwan Yook

Research output: Contribution to journalArticle

14 Citations (Scopus)


This letter presents a wrist pulse sensor based on reflection coefficient (S11) from a resonator which is applicable to existing wearable communication devices. The compact resonator is designed on flexible substrate as an RF signal radiator. Since the reflection coefficient from the resonator depends on the distance between the resonator and the wall of the major artery, slight changes in radial artery diameter can be utilized to obtain pulse rate at the wrist. The sensor system is implemented and tested at 2.4 GHz ISM band, and reveals excellent performance in terms of sensitivity as well as convenience as a wearable device compared to conventional piezoelectric or photoplethysmography (PPG) sensor.

Original languageEnglish
Article number6884867
Pages (from-to)719-721
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number10
Publication statusPublished - 2014 Oct 1


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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