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Broadband RFID tag antenna with quasi-isotropic radiation pattern

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3 Author(s)
Cho, C. ; Sch. of Electron. & Electr. Eng., Hongik Univ., Seoul, South Korea ; Choo, H. ; Park, I.

A passive RFID tag antenna in the UHF band using two bent dipoles and a modified double T-matching network is proposed. The antenna was fabricated with a thin copper layer printed on a 50 μm-thick PET substrate for low-cost production. The proposed antenna provided a quasi-isotropic radiation pattern and a fairly broad bandwidth S11<-10 dB, 8.5%) for conjugate-matching with a commercial tag chip. The efficiency of the antenna was about 90% in the operating frequency band. The measured readable range was between 170 -240 cm for an arbitrary rotation angle of the tag.

Published in:

Electronics Letters  (Volume:41 ,  Issue: 20 )
RFID Virtual Journal, IEEE