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A Reconfigurable Passive UHF Reader Loop Antenna for Near-Field and Far-Field RFID Applications

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4 Author(s)
Alejandro L. Borja ; Departamento de Ingeniera Elctrica, Electrnica, Automtica y Comunicaciones Campus Universitario, Universidad de Castilla-La Mancha, Cuenca, Spain ; Angel Belenguer ; Joaquin Cascon ; James R. Kelly

This letter presents a passive UHF printed loop antenna with left-handed loading. The RFID reader antenna can work at near- and far-field operation within the European UHF (865-868 MHz) band. The operation frequency and radiation properties can be modified by employing varactor diodes. Also, the antenna can work in the near-field region having a flat magnetic distribution in the interrogation zone. A comparative study with other passive RFID reader conventional antennas shows that the left-handed loop achieves stronger near H-field with good impedance matching. Design details, simulated results, and a fabricated prototype are presented. The concept significantly extends the design degrees of freedom for RFID antennas.

Published in:

IEEE Antennas and Wireless Propagation Letters  (Volume:11 )