Detection of vital signs for multiple subjects by using self-injection-locked radar and mutually injection-locked beam scanning array

This study combines self-injection-locked (SIL) radar and ILO-based phased array to conduct non-contact vital sign detection on multiple users. For this purpose, multiple injection-locked oscillators (ILOs) are mutual injection locked to each other at a common frequency. By adjusting the tuning volt...

Full description

Saved in:
Bibliographic Details
Published in2017 IEEE MTT-S International Microwave Symposium (IMS) pp. 991 - 994
Main Authors Chung-Yi Hsu, Cho-Ying Chuang, Fu-Kang Wang, Tzyy-Sheng Horng, Lih-Tyng Hwang
Format Conference Proceeding
LanguageEnglish
Japanese
Published IEEE 01.06.2017
Subjects
Azimuth
beam scanning
injection-locked oscillator (ILO)
mutually injection-locked oscillators
Oscillators
phased array
Phased arrays
Radar
self-injection-locked (SIL) radar
Tuning
Vital sign detection
Online AccessGet full text

Cover

More Information
Summary:This study combines self-injection-locked (SIL) radar and ILO-based phased array to conduct non-contact vital sign detection on multiple users. For this purpose, multiple injection-locked oscillators (ILOs) are mutual injection locked to each other at a common frequency. By adjusting the tuning voltages of ILOs, the phase shift among ILOs can be controlled, and therefore the beam scanning of the array can be achieved. Moreover, the signals reflected from the chest of the subjects are injected into the ILOs to enter an SIL state for radar operation. In the experiment, the prototype operating in the 2.4-GHz ISM band is utilized to detect the vital signs of three subjects within two meters at different azimuth angles relative to the array.
DOI:10.1109/MWSYM.2017.8058756