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Miniaturized Circularly Polarized Doppler Radar for Human Vital Sign Detection.

Authors :
He, Yuchu
Gu, Changzhan
Ma, Haijiang
Zhu, Jiang
Eleftheriades, George V.
Source :
IEEE Transactions on Antennas & Propagation; Nov2019, Vol. 67 Issue 11, p7022-7030, 9p
Publication Year :
2019

Abstract

In this paper, a miniaturized circularly polarized (CP) continuous wave Doppler radar system operating at 2.4 GHz is presented. The radar front end consists of one left-handed CP (LHCP) antenna and one right-handed CP (RHCP) antenna, which share a single patch antenna aperture. Orthogonal polarization is achieved through a modified ring-shaped quadrature hybrid coupler (QHC), and the resulting isolation between the two CP antennas is better than 30 dB. With 0 dBm input power to the transmitting antenna, the proposed radar system can accurately detect heartbeat and respiration movements of human test subjects under 1 m and over a wide angular range. The single dual CP antenna achieves 280% size reduction compared to a traditional two linear polarization patch antenna array with the same isolation level. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
0018926X
Volume :
67
Issue :
11
Database :
Complementary Index
Journal :
IEEE Transactions on Antennas & Propagation
Publication Type :
Academic Journal
Accession number :
139437596
Full Text :
https://doi.org/10.1109/TAP.2019.2927777