In this work, a new design of wireless sensing modules for the wireless sensor network was proposed and the specifications were tested (Received Signal Strength Indicator -RSSI, Packet Reception Ratio -PRR, Link Quality Indicator -LQI) in comparison with some commercial products. Indeed, we focus on the design of wireless sensing nodes and programming of the data transfer protocol for wireless sensing nodes (from the PHYSICAL layer to MAC layer) Experimental results show that the designed wireless sensing modules have the potential for real-world application with readrange (over 150 m), RSSI (bigger than -80 dBm), LQI (bigger than 108) and PRR (over 99%) in the range between 0 and 150 m.
ARTICLE HISTORY
In this paper, the authors present several antenna structures for RFID passive tags with direct chip connection. In this study, the substrate is PET (Polyethylene terephthalate) with 80μm thickness, the conductive layer is copper with 10μm thickness and CST Microwave Studio is used for simulation. The antenna design process is described and related results are shown. The goal of this study is to achieve compact size, good matching impedance, and to increase the bandwidth and read range of the tag as much as possible. The prototypes were fabricated by sputtering technology with 1μm thickness, then thickened by electroplating technique and finally tested by hand-held reader for read range characterizations.
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