Self-Injection-Locked AIA Radar Sensor Using PLL Demodulator for N oncontact Vital Sign Detection

In this paper, a new self-injection-Iocked radar sensor with a self-oscillating active-integrated-antenna (AIA) and a phase-locked-loop demodulator is presented for noncontact vital sign detection. The AIA is developed to simultaneously radiate the radio-frequency signal and receive the back-scatter...

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Bibliographic Details
Published in2018 IEEE/MTT-S International Microwave Symposium - IMS pp. 252 - 254
Main Authors Tseng, Chao-Hsiung, Yu, Li-Te
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2018
Subjects
Active integrated antenna (AlA)
Demodulation
Frequency modulation
injection locking
Oscillators
Phase locked loops
phase-locked-loop (PLL) demodulator
Radar antennas
Radar detection
self-injection-locked (SIL) radar
vital-sign sensor
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Summary:In this paper, a new self-injection-Iocked radar sensor with a self-oscillating active-integrated-antenna (AIA) and a phase-locked-loop demodulator is presented for noncontact vital sign detection. The AIA is developed to simultaneously radiate the radio-frequency signal and receive the back-scattered injection signal, which is phase-modulated by the chest movement of the human subject. According to the injection-locking theory, the oscillation frequency of the AIA will be shifted by injecting a signal with a phase variation, which amounts to the frequency modulation. Hence, the vital sign can be demodulated by a PLL demodulator. The developed radar sensor has been experimentally verified as the human subject is located at the distances of 1.5 m away from the radar sensor.
ISSN:2576-7216
DOI:10.1109/MWSYM.2018.8439357