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http://dx.doi.org/10.7840/kics.2013.38C.9.813

Non-Contact Vital Signal Sensor Based on Impedance Variation of Resonator  

Kim, Kee-Yun ((주)LG전자)
Kim, Sang-Gyu ((주)LG전자)
Hong, Yunseog (삼성탈레스(주))
Yook, Jong-Gwan (연세대학교 전기전자공학과 Advanced Computational Electromagnetics Lab.)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.38C, no.9, 2013 , pp. 813-821 More about this Journal
Abstract
In this paper, a vital signal sensor based on impedance variation of resonator is presented. Proposed vital signal sensor can detect the vital signal, such as respiration and heart-beat signal. System is composed of resonator, oscillator, surface acoustic wave (SAW) filter, and power detector. The cyclical movement of a dielectric such as a human body, causes the impedance variation of resonator within the near-field range. So oscillator's oscillation frequency variation is effected on resonator's resonant frequency. SAW filter's skirt characteristic of frequency response can be transformed a small amount of frequency deviation to a large variation. Aim to enhance the existing sensor detection range, proposed sensor operates in 870 MHz ISM band, and detect respiration and heart-beat signal at distance of 120 mm.
Keywords
Oscillator; Planar resonator; RF power detector; SAW filter;
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