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Design of a double-layered spiral antenna for radio frequency identification applications

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4 Author(s)
Lee, C. ; Sch. of Electron. & Electr. Eng., Hongik Univ., Seoul, South Korea ; Han, W.K. ; Park, I. ; Choo, H.

In this study, the authors describe a novel circularly polarised (CP) double-layered spiral antenna (DLSA) consisting of two main spiral radiators printed on a thin substrate, a feed line and a folded ground plane for a ultra-high-frequency (UHF) band radio frequency identification (RFID) reader. The proposed antenna exhibits broad impedance and CP bandwidth characteristics. The fabricated prototype has an axial ratio of less than 3 dB, a return loss of less than 10 dB over an 860 960 MHz range and a gain of 6.7 dB in the operating frequency range. This performance confirms that the proposed antenna is appropriate for commercial RFID use in the UHF band.

Published in:

Microwaves, Antennas & Propagation, IET  (Volume:4 ,  Issue: 1 )