Miniaturized Circularly Polarized Doppler Radar for Human Vital Sign Detection

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 polarizati...

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Veröffentlicht in:IEEE transactions on antennas and propagation Jg. 67; H. 11; S. 7022 - 7030
Hauptverfasser: He, Yuchu, Gu, Changzhan, Ma, Haijiang, Zhu, Jiang, Eleftheriades, George V.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 01.11.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Antenna arrays
Apertures
Circular polarization
Continuous radiation
Couplers
Doppler radar
Gain
Linear polarization
patch antenna
Patch antennas
Polarization
Quadratures
Radar antennas
Radar equipment
Radar systems
Size reduction
ISSN:0018-926X, 1558-2221
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Zusammenfassung: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.
Bibliographie:ObjectType-Article-1
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content type line 14
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2019.2927777