RSSI-Based Living-Body Radar Using Single RF Front-End and Tunable Parasitic Antennas

Katsumi SASAKI  Naoki HONMA  Takeshi NAKAYAMA  Shoichi IIZUKA  

IEICE TRANSACTIONS on Communications   Vol.E101-B   No.2   pp.392-399
Publication Date: 2018/02/01
Publicized: 2017/08/22
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017ISP0022
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2016)
Category: DOA Estimation
DOA estimation,  parasitic antenna,  RSSI,  microwave sensors,  

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This paper presents the Received-Signal-Strength-Indicator (RSSI) based living-body radar, which uses only a single RF front-end and a few parasitic antennas. This radar measures the RSSI variation at the single active antenna while varying the terminations of the parasitic antennas. The propagation channel is estimated from just the temporal transition of RSSI; our proposal reconstructs the phase information of the signal. In this paper, we aim to estimate the direction of living-body. Experiments are carried out and it is found that most angular errors are within the limit of the angular width of the living-body.