Six-port radar sensor for remote respiration rate and heartbeat vital-sign monitoring

Journal
IEEE transactions on microwave theory and techniques  
Volume
61
Issue
5
Start Page
2093
End Page
2100
Article Number
6473856
Citation
IEEE Transactions on Microwave Theory and Techniques 5 (61): 6473856 (2013-03-11)
Publisher DOI
10.1109/TMTT.2013.2247055
A novel remote respiration and heartbeat monitoring sensor is presented. The device is a monostatic radar based on a six-port interferometer operating a continuous-wave signal at 24 GHz and a radiated power of less than 3 μW. Minor mechanical movements of the patient's body caused by the respiration as well as hearbeat can be tracked by analyzing the phase modulation of the backscattered signal by means of microwave interferometry with the six-port network. High-distance measurement accuracy in the micrometer scale as well as low system complexity are the benefits of the six-port receiver. To verify the performance of the system, different body areas have been observed by the six-port radar. The proposed system has been tested and validated by measurement results.
Subjects
Heartbeat monitoring
remote sensing
respiration rate monitoring
six-port
vital sign