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 language | English |
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Title of host publication | Conference Proceedings - 2014 IEEE MTT-S International Microwave Workshop Series on |
Subtitle of host publication | RF and Wireless Technologies for Biomedical and Healthcare Applications, IMWS-Bio 2014 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
ISBN (Electronic) | 9781479954476 |
DOIs | |
State | Published - 05 02 2015 |
Event | 2014 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 2014 → 10 12 2014 |
Publication series
Name | Conference Proceedings - 2014 IEEE MTT-S International Microwave Workshop Series on: RF and Wireless Technologies for Biomedical and Healthcare Applications, IMWS-Bio 2014 |
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Conference
Conference | 2014 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications, IMWS-Bio 2014 |
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Country/Territory | United Kingdom |
City | London |
Period | 08/12/14 → 10/12/14 |
Bibliographical note
Publisher Copyright:© 2014 IEEE.
Keywords
- direct conversion mixer
- phase shift
- vital signal detection radar