Design of a multipolarized RFID reader antenna for UHF near-field applications
3344 - 3351
IEEE Transactions on Antennas and Propagation
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This paper presents our investigation into a novel ultrahigh-frequency (UHF) radio frequency identification (RFID) multipolarized reader antenna based on a pair of symmetrical meandering open-ended microstrip lines for near-field applications. The near-field and multipolarization operation is achieved by introducing a 90° phase shift between the currents flowing along the opposite side of two branches. The proposed antenna is shown to generate a uniform and strong electric field in its near-field region within a reading volume: 450 mm × times 450 mm × 350 mm (width × length × height). The simulated and measured impedance bandwidths (-10 dB) agree very well, ranging from 825 to 965 MHz and covering the UHF RFID standard. In addition, it exhibits a low far-field gain, avoiding to misreading the tags outside the near-field region. The fabricated antenna was fully tested with multiple tag antennas that are placed in different orientations and even in a conveyor system, demonstrating a 100% reading rate of arbitrarily oriented tags within the reading zone.
AuthorsYao, Y; Liang, Y; Yu, J; Chen, X
- College Publications