Title :
A slotted circularly-polarized patch antenna for near-field and far-field UHF RFID applications
Author :
Chean Khan Goh ; Xianming Qing ; Zhi Ning Chen
Author_Institution :
Inst. for Infocomm Res., Singapore, Singapore
Abstract :
A slotted patch antenna is proposed for near-field and far-field ultra high frequency (UHF) radio frequency identification (RFID) applications. By slotting the patch, the antenna is able to produce strong and uniform magnetic field in the near field and generate the circularly-polarized radiation in the far field. The fabricated antenna (90 mm × 90 mm × 4.5 mm) with 10-dB return loss and 3-dBic gain from 913 MHz to 924 MHz, achieves a 100% reading rate for arbitrary oriented near-field tag over a distance of 35 mm and offers a far-field tag reading up to 3.6 m. The antenna is suitable for portable near-field and far-field UHF RFID readers.
Keywords :
UHF antennas; antenna radiation patterns; electromagnetic wave polarisation; microstrip antennas; radiofrequency identification; slot antennas; arbitrary oriented near-field tag; circularly-polarized radiation generation; far-field UHF RFID application; far-field UHF RFID reader; frequency 913 MHz to 924 MHz; loss 10 dB; magnetic field; near-field UHF RFID application; slotted circularly-polarized patch antenna; ultrahigh frequency radiofrequency identification application; Antenna measurements; Magnetic field measurement; Magnetic fields; Patch antennas; Radiofrequency identification; UHF antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2014 IEEE
Conference_Location :
Memphis, TN
Print_ISBN :
978-1-4799-3538-3
DOI :
10.1109/APS.2014.6905083
