Title :
Dual-band circularly polarized rectangular loop slot antenna for UHF-RFID reader
Author :
Phongcharoenpanich, Chuwong ; Sricharoen, Busaya
Author_Institution :
Fac. of Eng., King Mongkut´s Inst. of Technol. Ladkrabang, Bangkok, Thailand
Abstract :
In this paper, a dual-band circularly polarized rectangular loop slot antenna with notched hexagonal aperture fed by a microstrip line has been optimized for the UHF and microwave RFID applications. It is obvious that the antenna radiates bi-directional beam with the measured HPBW of 82 degree in YZ-plane and 66 degree in XZ-plane at the center frequency of the UHF band. The measured HPBW in YZ-plane and XZ-plane at 2.45 GHz are 90 degree and 70 degree. The measured axial ratios at the center frequency of the UHF and the microwave band are 0.09 dB and 0.55 dB, respectively. The proposed antenna can be efficiently used as the reader antenna of the UHF and microwave RFID systems.
Keywords :
UHF antennas; antenna feeds; antenna radiation patterns; aperture antennas; directive antennas; electromagnetic wave polarisation; loop antennas; microstrip lines; microwave antennas; multifrequency antennas; radiofrequency identification; slot antennas; HPBW; UHF application; UHF band; UHF-RFID reader; antenna radiation; axial ratio measurement; bidirectional beam; dual-band circularly polarized rectangular loop slot antenna; frequency 2.45 GHz; microstrip line; microwave RFID application; microwave RFID system; microwave band; notched hexagonal aperture fed; reader antenna; Antenna measurements; Apertures; Frequency measurement; Microstrip antennas; Microwave measurements; Slot antennas; UHF measurements;
Conference_Titel :
Wireless Information Technology and Systems (ICWITS), 2012 IEEE International Conference on
Conference_Location :
Maui, HI
Print_ISBN :
978-1-4673-0947-9
DOI :
10.1109/ICWITS.2012.6417822
