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J. Electromagn. Eng. Sci > Volume 12(1); 2012 > Article
Journal of the Korean Institute of Electromagnetic and Science 2012;12(1):37-44.
DOI: https://doi.org/10.5515/JKIEES.2012.12.1.37   
Wireless RF Sensor Structure for Non-Contact Vital Sign Monitoring
Sang-Gyu Kim1, Gi-Ho Yun2, Jong-Gwan Yook1
1Degree in Electrical and Electronic Engineering, Yonsei University
2School of Information and Communication Engineering, Sungkyul University
Abstract
This paper describes a compact and novel wireless vital sign sensor at 2.4 GHz that can detect heartbeat and respiration signals. The oscillator circuit incorporates a planar resonator, which functions as a series feedback element as well as a near-field radiator. The periodic movement of a human body during aerobic exercise could cause an input impedance variation of the radiator within near-field range. This variation results in a corresponding change in the oscillation frequency and this change has been utilized for the sensing of human vital signs. In addition, a surface acoustic wave (SAW) filter and power detector have been used to increase the system sensitivity and to transform the frequency variation into a voltage waveform. The experimental results show that the proposed sensor placed 20 mm away from a human body can detect the vital signs very accurately.
Key words: Planar Resonator, Series Feedback Oscillator, Vital Sign Sensor
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