Title :
Circularly polarized antenna with circular shaped patch and strip for worldwide UHF RFID applications
Author :
Yi Liu ; Xiong-Ying Liu
Author_Institution :
Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China
Abstract :
A circularly polarized Radio Frequency Identification (RFID) reader antenna is proposed for worldwide Ultra-High Frequency (UHF) (840-960 MHz) applications. The antenna is composed of two circular shaped patches, a ring shaped strip, and a suspended conducting strip with open-circuited termination. The simulations show that the antenna has an impedance bandwidth (S11 <; -25 dB) of about 17.4% (807-961 MHz), 3-dB axial ratio (AR) bandwidth of about 14.4% (833-962 MHz), 2-dB AR bandwidth of 12.9% or 842-958 MHz, and gain level of about 9.1 dBic or larger within the 3-dB AR bandwidth. The proposed antenna can be a good candidate for universal UHF RFID readers at the UHF band of 840-960 MHz, which has excellent impedance matching (S11 <; -25 dB), high gain (Gain > 9.1 dBic), and good AR (AR<; 2 dB) performance.
Keywords :
UHF antennas; antenna radiation patterns; broadband antennas; impedance matching; microstrip antennas; radiofrequency identification; strip lines; bandwidth 807 MHz to 961 MHz; bandwidth 833 MHz to 962 MHz; bandwidth 840 MHz to 960 MHz; bandwidth 842 MHz to 958 MHz; broadband antenna; circular shaped patches; circular shaped strip; circularly polarized radio frequency identification reader antenna; gain 9.1 dB; impedance bandwidth; impedance matching; open-circuited termination; ring shaped strip; suspended conducting strip; worldwide UHF RFID applications; Antennas; Gain; Probes; Radio frequency; Radiofrequency identification; Strips; Broadband antenna; axial ratio (AR); circularly polarized (CP); impedance matching; ultra-high frequency (UHF);
Conference_Titel :
Antennas & Propagation (ISAP), 2013 Proceedings of the International Symposium on
Conference_Location :
Nanjing
Print_ISBN :
978-7-5641-4279-7
