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A fully UHF-powered smart sensor tag in food freshness monitoring  

Lam, Binh Minh (Department of Electronic Engineering, Pukyong National University)
Chung, Wan-Young (Department of Electronic Engineering, Pukyong National University)
Publication Information
Journal of the Institute of Convergence Signal Processing / v.19, no.3, 2018 , pp. 89-96 More about this Journal
Abstract
This study aims to develop a fully passive smart sensing tag utilizing RF (Radio Frequency) energy harvesting technology at UHF (Ultra High Frequency) band of 915MHz. To optimize the power collected under various radiated conditions, an efficient energy harvesting module exploiting a boost circuit with maximum power point tracking (MPPT) is employed. Specifically, the proposed tag features two orthogonal antennas to enhance its capability of both energy scavenging and data transmissions. The experimental result shows that the developed smart sensor tag can scavenge an RF input power of as low as 0.19mW at a distance of 4 meters for a 3.6Vdc output. Furthermore, the proposed smart sensor tag performs the feasibility of completely autonomous monitoring food freshness at 2 meters with a low-power sensor array.
Keywords
RF energy harvesting; far-field RF energy harvesting; smart sensor tag; food freshness monitoring;
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