Title :
A cavity backed UHF near-field segmented loop antenna
Author :
Shi, Jin ; Qing, Xianming ; Chen, Zhi Ning
Author_Institution :
Inst. for Infocomm Res., Singapore, Singapore
Abstract :
A cavity backed segmented loop antenna is proposed for ultra high frequency (UHF) near-field radio frequency identification (RFID) readers. The induced current along the cavity edges shows significant effect on the impedance matching and magnetic field distribution of the segmented loop antenna. A backed cavity with optimized dimensions enables the antenna generating stronger magnetic field so that the reading range is enhanced. The reading range of an antenna prototype with a cavity of optimized dimensions of 234 mm × 234 mm × 51 mm is increased by 7 mm compared to that of the segmented loop antenna without any cavity.
Keywords :
UHF antennas; impedance matching; loop antennas; radiofrequency identification; UHF-RFID readers; cavity backed UHF near-field segmented loop antenna; cavity edges; impedance matching; induced current; magnetic field distribution; ultrahigh frequency near-field radio frequency identification readers; Antenna measurements; Cavity resonators; Magnetic fields; Radiofrequency identification; UHF antennas; Cavity backed; RFID; UHF; near-field antenna; segmented loop;
Conference_Titel :
Antennas and Propagation (APCAP), 2012 IEEE Asia-Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
978-1-4673-0666-9
DOI :
10.1109/APCAP.2012.6333130
