Related Experiment Video
Updated: Mar 12, 2026
A Novel Digital Platform for a Monitored Home-based Cardiac Rehabilitation Program
Published on: April 19, 2019
Wrist Pulse Rate Monitor Using Self-Injection-Locked Radar Technology
Fu-Kang Wang1, Mu-Cyun Tang2, Sheng-Chao Su3
1Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan. fkw@mail.ee.nsysu.edu.tw.
Abstract:
To achieve sensitivity, comfort, and durability in vital sign monitoring, this study explores the use of radar technologies in wearable devices. The study first detected the respiratory rates and heart rates of a subject at a one-meter distance using a self-injection-locked (SIL) radar and a conventional continuous-wave (CW) radar to compare the sensitivity versus power consumption between the two radars. Then, a pulse rate monitor was constructed based on a bistatic SIL radar architecture. This monitor uses an active antenna that is composed of a SIL oscillator (SILO) and a patch antenna. When attached to a band worn on the subject's wrist, the active antenna can monitor the pulse on the subject's wrist by modulating the SILO with the associated Doppler signal. Subsequently, the SILO's output signal is received and demodulated by a remote frequency discriminator to obtain the pulse rate information.
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