Title :
Design of a novel circularly polarized annular-ring RFID tag antenna for metallic surfaces
Author :
Ran Liu ; Yuan Yao ; Youbo Zhang ; Hongbin Ge ; Wenjing Lee ; Junsheng Yu ; Xiaodong Chen
Author_Institution :
Sch. of Electron. Eng., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
A novel circularly polarized tag antenna designed for RFID UHF band is proposed. An annular-ring microstrip patch with a pair of inserted slits is used to achieve circularly polarized operation. By choosing the proper lengths of two short-circuited arc microstrip lines and its coupling distance, good complex impedance matching can be obtained. The 10 dB return-loss bandwidth of the tag antenna is measured to be 215 MHz (720-935MHz), while its 3 dB axial-ratio bandwidth is 6 MHz (919-925 MHz). Further experiment shows that the tag antenna could provide better reading range when mounted on a metallic surface.
Keywords :
HF antennas; UHF antennas; VHF antennas; arcs (electric); electromagnetic wave polarisation; impedance matching; loop antennas; microstrip antennas; microstrip lines; radiofrequency identification; RFID UHF band; annular-ring microstrip patch; bandwidth 215 MHz; bandwidth 6 MHz; circularly polarized annular-ring RFID tag antenna; complex impedance matching; coupling distance; frequency 720 MHz to 935 MHz; loss 10 dB; loss 3 dB; metallic surface; return-loss bandwidth; short-circuited arc microstrip line; Antenna measurements; Antenna radiation patterns; Microstrip; Microstrip antennas; Radiofrequency identification; UHF antennas; RFID; annular-ring microshtip; circularly polarization; tag antenna;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2013 Asia-Pacific
Conference_Location :
Seoul
DOI :
10.1109/APMC.2013.6695108
