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This paper presents a novel architecture of inkjet-printed passive UHF RFID based sensor tag for wireless gas (CO2) sensing. An RFID tag made with Silver (Ag) ink is loaded with carbon nanotube (CNT) ink for sensing purpose. A switch in its structure provides two modes of operation, sensor on (SON) mode and sensor off (SOFF) mode. In SON mode, the sensor tag modifies its backscatter properties in...
This paper studies the implementation of an RFID chipless sensor based on split ring resonators. It operates in the ISM band at 2.45GHz to detect a change of carbon dioxide, and a variation of temperature. The realization of this passive wireless sensor involves inkjet printing using several ink types so that a device that works can be realized from scratch in a few stages. The substrates used are...
A new chipless sensor for water droplet detection is proposed. This concept is demonstrated by inkjet-printing a dual rhombic loop scatterer on a flexible substrate having a size of 4×2cm2 only. This sensor operates in the ISM band at 2.45 GHz. The scatterer is doped with a thin layer of carbon nanotube-based organic ink to enhance its sensitivity in the presence of water. Strong water molecule adsorption...
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