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Novel Miniaturized Folded Line Antenna for Passive UHF RFID Tags

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RFID (Radio Frequency IDentification) in UHF (Ultra High Frequency) has received considerable attention due to the different advantages offered in various fields. The tags in this technology must be attached to small objects. Therefore, the antennas size needs to be miniaturized without significant degradation. In this paper, a novel miniaturized tag antenna for UHF RFID applications is presented. The miniaturized antenna is composed of a folded line and an inductively coupled feeding loop: the antenna line is folded to reduce the antenna size, and the inductively coupled loop is used to match the antenna impedance to the chip to maximize power transfer. The miniaturized antenna is designed to operate in the USA band at around 915 MHz, and printed on a polyester substrate with a thickness of 50 µm. The performances of the proposed antenna regarding impedance, reading distance, return loss and antenna gain are evaluated using a 3D electromagnetic simulators HFSS (High Frequency Structure Simulator) and CST-MWS (Computer Simulation Technology-MicroWaves Studio) and are compared to those achieved by the conventional dipole antenna with an inductively coupled loop.
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Folding Method; Inductively Coupled Loop Technique; Passive Tags Antennas; UHF RFID Tags; Miniaturized Antenna; Impedance Matching

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