Title :
Broadband RFID tag antenna with quasi-isotropic radiation pattern
Author :
Cho, C. ; Choo, H. ; Park, I.
Author_Institution :
Sch. of Electron. & Electr. Eng., Hongik Univ., Seoul, South Korea
Abstract :
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.
Keywords :
UHF antennas; antenna radiation patterns; broadband antennas; dipole antennas; radiofrequency identification; 170 to 240 cm; 50 micron; 880 to 940 MHz; 90 percent; PET substrate; UHF band; bent dipoles; broadband RFID tag antenna; conjugate-matching bandwidth; modified double T-matching network; passive RFID tag antenna; quasi-isotropic radiation pattern; radio frequency identification; thin copper layer;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20052337
