Frequency-Offset Self-Injection-Locked (FOSIL) Radar for Noncontact Vital Sign Monitoring

This paper presents a novel frequency-offset self-injection-locked (FOSIL) radar that uses up/down-mixers to combine two self-injection-locked (SIL) radars. By properly adjusting the injection phases and amplitudes, the transmit frequency of the proposed architecture is held constant, and the electr...

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Bibliographic Details
Main Authors: Juan, Pin-Hsun, Chen, Kuan-Hung, Wang, Fu-Kang
Format: Conference Proceeding
Language:English
Subjects:
Doppler radar
Electromagnetic interference
electromagnetic interference (EMI)
frequency-offset technique
Prototypes
Radar antennas
self-injection-locked (SIL) radar
Sensitivity
vital sign
Wireless communication
Wireless sensor networks
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Summary:This paper presents a novel frequency-offset self-injection-locked (FOSIL) radar that uses up/down-mixers to combine two self-injection-locked (SIL) radars. By properly adjusting the injection phases and amplitudes, the transmit frequency of the proposed architecture is held constant, and the electromagnetic interference (EMI) issue associated with a conventional SIL radar is thus resolved, allowing multiple wireless devices to coexist within a limited bandwidth. Also, the Doppler sensitivity is improved by the up-converted transmit frequency of the radar. In the experiments, a 5.8 GHz ISM-band FOSIL prototype that was composed of 2.8 and 3.0 GHz SIL radars was used to detect a moving metal plate and a seated subject. The theoretical predictions and measurements were in good agreement.
ISSN:2576-7216
DOI:10.1109/IMS30576.2020.9224009