Title :
UHF reader loop antenna for near-field RFID applications
Author :
Liu, Han-Wen ; Wu, K.-H. ; Yang, Chang-Fa
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan
Abstract :
A novel reader loop-type antenna for ultra-high-frequency (UHF) near-field radio frequency identification (RFID) applications is presented. This antenna, printed on a 0.8 mm-thick FR4 substrate with a diameter of 16 cm, is composed of four curved strips and four pairs of coupled stubs, and achieves a wide impedance bandwidth from 840 to 1300 MHz. The proposed structure can make large currents along the loop so that a strong and uniform magnetic field distribution is excited in the region around the antenna. Measurements show that the antenna operating with a commercial reader demonstrates good performance of tag identification with inductive coupling for near-field RFID applications.
Keywords :
UHF antennas; loop antennas; radiofrequency identification; FR4 substrate; UHF reader loop antenna; bandwidth 840 MHz to 1300 MHz; inductive coupling; magnetic field distribution; radiofrequency identification; size 0.8 mm; size 16 cm; tag identification;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2010.2868
