Proximity vital sign sensor using self-oscillating mixer

Sangin Kim, Byung Hyun Kim, Jong Gwan Yook, Gi Ho Yun

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

This paper presents a design of proximity vital sign sensor using a self-oscillating mixer (SOM) at 2.45 GHz. The proposed system consists of a planar resonator that determines the oscillation frequency and a transistor that functions not only as an oscillator but also as a mixer. Note that the supply voltage of the transistor is in pinch-off region to maximize non-linearity. The input impedance of the resonator is varied due to the distance variation between the human body and the resonator. This variation of input impedance changes the oscillation frequency of the proposed sensor. Then, this frequency deviation is self-mixed in the transistor. It can be detected at the emitter in a form of DC voltage, because the proposed system is a kind of direct conversion receiver. So, if we track the emitter voltage, we can obtain the vital sign of the human subject. The measurement results confirm that the proposed sensor can detect the vital sign at 20 mm away from a subject.

Original languageEnglish
Title of host publication2016 URSI Asia-Pacific Radio Science Conference, URSI AP-RASC 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1446-1448
Number of pages3
ISBN (Electronic)9781467388016
DOIs
Publication statusPublished - 2016 Oct 19
Event2016 URSI Asia-Pacific Radio Science Conference, URSI AP-RASC 2016 - Seoul, Korea, Republic of
Duration: 2016 Aug 212016 Aug 25

Publication series

Name2016 URSI Asia-Pacific Radio Science Conference, URSI AP-RASC 2016

Other

Other2016 URSI Asia-Pacific Radio Science Conference, URSI AP-RASC 2016
CountryKorea, Republic of
CitySeoul
Period16/8/2116/8/25

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Instrumentation
  • Computer Networks and Communications

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  • Cite this

    Kim, S., Kim, B. H., Yook, J. G., & Yun, G. H. (2016). Proximity vital sign sensor using self-oscillating mixer. In 2016 URSI Asia-Pacific Radio Science Conference, URSI AP-RASC 2016 (pp. 1446-1448). [7601402] (2016 URSI Asia-Pacific Radio Science Conference, URSI AP-RASC 2016). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/URSIAP-RASC.2016.7601402