Title :
RFID Reader Front-End Having Robust Tx Leakage Canceller for Load Variation
Author :
Lim, Won-Gyu ; Park, Seo-Young ; Son, Wang-Ik ; Lee, Moon-Que ; Yu, Jong-Won
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon
fDate :
5/1/2009 12:00:00 AM
Abstract :
A novel front-end structure for ultra-high-frequency RF identification reader is proposed. The proposed front-end consists of a balanced coupler and four-port feed antenna system. The proposed balanced coupler structure has high transmit/receiver isolation feature and good insensitivity to load variations. The proposed four-port feed antenna system is applied for removing the coupling among antennas, which deteriorates the isolation. The proposed system is numerically analyzed and verified experimentally as well.
Keywords :
antenna feeds; radiofrequency identification; transmitting antennas; RFID reader front-end; balanced coupler; balanced coupler structure; four-port feed antenna system; isolation feature; load variation; robust Tx leakage canceller; ultra-high-frequency RF identification reader; Antenna isolation; directional coupler; load impedance variation; ultra-high-frequency (UHF) RF identification (RFID);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2009.2017308
