Haiyu Huang, Pai-Yen Chen, Cheng-Hsien Hung, R. Gharpurey, D. Akinwande
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Frequency hopped wireless passive sensing system with harmonic transponder antenna sensor
This paper presents a passive wireless sensing paradigm based on the harmonic transponder comprising an antenna covered with a metamaterial-inspired helical structure, which is sensitive to the liquid-level within. An interrogator transmits frequency hopped UHF RFID signals to the transponder, and a sniffer detects the harmonic signal from the transponder and decodes its RSSI array. A μL-resolution absolute accuracy sensing is demonstrated to support the low-cost ubiquitous liquid monitoring.
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