부산대학교 도서관

RFID (Radio Frequency Identification) UHF (Ultra High Frequency) is a wireless identification technology that has many advantages. The technology’s tags are most often attached to the objects to be tagged for tracking and identification. The miniaturization of the antenna allows to reduce the size of the antennas. A novel meandering dipole antenna for RFID applications is presented in this paper. The miniaturization of this antenna is achieved by bending the inductive lines creating a capacitive effect between these lines. A T-shaped matching circuit as well as shorting lines drawn from top to bottom on both sides of the matching circuit allowed us to obtain a good match between the antenna and the NXP UCODE G2XL chip (Z=16-j156 $\Omega$) at 867MHz. The miniature antenna, which resonates at 867MHz in the European band, presented is designed based on copper of thickness e=35$ \mu$m which is printed on an FR4 epoxy substrate of thickness h=1.6 mm. The prototype is simulated on several complex environments and the results are presented in this paper. The 3D electromagnetic simulator HFSS (High Frequency Structure Simulator) allowed us to simulate the antenna performance such as input impedance, return loss, radiation pattern and antenna gain.