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http://dx.doi.org/10.5515/JKIEES.2012.12.4.234

A Compact Ka-Band Doppler Radar Sensor for Remote Human Vital Signal Detection  

Han, Janghoon (Dept. of Electronic Engineering, Kwangwoon University)
Kim, Jeong-Geun (Dept. of Electronic Engineering, Kwangwoon University)
Hong, Songcheol (Dept. of Electrical Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
Journal of electromagnetic engineering and science / v.12, no.4, 2012 , pp. 234-239 More about this Journal
Abstract
This paper presents a compact K-band Doppler radar sensor for human vital signal detection that uses a radar configuration with only single coupler. The proposed radar front-end configuration can reduce the chip size and the additional RF power loss. The radar front-end IC is composed of a Lange coupler, VCO, and single balanced mixer. The oscillation frequency of the VCO is from 27.3 to 27.8 GHz. The phase noise of the VCO is -91.2 dBc/Hz at a 1 MHz offset frequency, and the output power is -4.8 dBm. The conversion gain of the mixer is about 11 dB. The chip size is $0.89{\times}1.47mm^2$. The compact Ka-band Doppler radar system was developed in order to demonstrate remote human vital signal detection. The radar system consists of a Ka-band Doppler radar module with a $2{\times}2$ patch array antenna, baseband signal conditioning block, DAQ system, and signal processing program. The front-end module size is $2.5{\times}2.5cm^2$. The proposed radar sensor can properly capture a human heartbeat and respiration rate at the distance of 50 cm.
Keywords
Ka-Band Doppler Radar; Compact Radar System; Remote Human Vital Signal Detection; Bio-Radar;
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