Title :
Meandering cross dipole antenna for RFID applications
Author :
Wei He ; Yejun He ; Hang Wong
Author_Institution :
Shenzhen Key Lab. of Adv. Commun. & Inf. Process., Shenzhen Univ., Shenzhen, China
Abstract :
A circularly polarized (CP) UHF RFID tag antenna is proposed in this paper. This antenna is realized by a meandering cross dipole. The meandering structure of the dipole could adjust amplitudes and phases from the two orthogonal arms of the cross dipole such that a CP frequency would be generated by the mutually-orthogonal mode. Therefore, we can achieve CP operation from the tag. The maximum transmitted power can be obtained when the input impedance of the tag is conjugate-match with the impedance of the RFID chip. A special matching structure is employed in this design to control the input impedance of the tag. This tag antenna is designed to cover whole UHF band (840-960 MHz), and its 3-dB axial-ratio (AR) bandwidth is 43 MHz (905-948 MHz).
Keywords :
UHF antennas; dipole antennas; radiofrequency identification; RFID chip; UHF RFID tag antenna; bandwidth 43 MHz; circularly polarized antenna; conjugate match; frequency 840 MHz to 948 MHz; meandering cross dipole antenna; meandering structure; mutually-orthogonal mode; orthogonal arms; transmitted power; Bandwidth; Broadband antennas; Dipole antennas; Impedance; Radiofrequency identification; UHF antennas; circularly polarized; dipole antenna; radio frequency identification (RFID); tag antenna;
Conference_Titel :
Electromagnetics (iWEM), 2013 IEEE International Workshop on
Conference_Location :
Kowloon
Print_ISBN :
978-1-4799-6654-7
DOI :
10.1109/iWEM.2013.6888797
