Null point elimination using biphase states in a direct conversion vital signal detection radar

Yuan Pou Chen, Ti Tan Chen, Kuang Ta Sun, Yi Chyun Chiang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

A novel noncontact heartbeat and respiration monitoring system that can eliminate the null point in the detection of vital signal is reported. The new type of vital signal radar is composed of a variable-gain low-noise amplifier, direct conversion mixer, biphase phase shifter, and local oscillator, which are all homemade circuits constructed with Si bipolar transistors. Moreover, the radar consumes less than 20 mA under a 3 V biasing voltage. A 2.4 GHz experimental prototype was fabricated to verify the proposed null point elimination method. Measurements show good agreement with the theoretical prediction that the radar can clearly detect heartbeat and respiration signals at any point within the detectable range of the radar. The proposed radar system was shown to be a low-power and cost-effective solution for vital signal detection without the problem of null point.

Original languageEnglish
Title of host publicationConference Proceedings - 2014 IEEE MTT-S International Microwave Workshop Series on
Subtitle of host publicationRF and Wireless Technologies for Biomedical and Healthcare Applications, IMWS-Bio 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479954476
DOIs
StatePublished - 05 02 2015
Event2014 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, IMWS-Bio 2014 - London, United Kingdom
Duration: 08 12 201410 12 2014

Publication series

NameConference Proceedings - 2014 IEEE MTT-S International Microwave Workshop Series on: RF and Wireless Technologies for Biomedical and Healthcare Applications, IMWS-Bio 2014

Conference

Conference2014 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, IMWS-Bio 2014
Country/TerritoryUnited Kingdom
CityLondon
Period08/12/1410/12/14

Bibliographical note

Publisher Copyright:
© 2014 IEEE.

Keywords

  • direct conversion mixer
  • phase shift
  • vital signal detection radar

Fingerprint

Dive into the research topics of 'Null point elimination using biphase states in a direct conversion vital signal detection radar'. Together they form a unique fingerprint.

Cite this