A novel UHF RFID dual-band tag antenna with inductively coupled feed structure

A dual-band tag antenna for UHF RFID systems is proposed. The tag antenna is composed of a zigzag main body and a zigzag loop, which is an inductively coupled feed structure antenna. The proposed structure is simple, which is not only easy to adjust the matching impedance but also to reduce the size of the antenna. Compared with the same type of antennas, this antenna structure is more compact and the length of antenna is reduced by at least 18%. Using the Alien´s Higgs-3 tag chip, the proposed antenna operates at 860 MHz and 920 MHz, and the impedance match is achieved in a wide frequency band. We also measure the reading distances of the tag. Simulation and measurement results show that the proposed antenna has good performance and is very practical.