Title :
Linear/circular polarization switchable antenna for UHF RFID reader
Author :
Kruekaew, Adool ; Phongcharoenpanich, Chuwong
Author_Institution :
Fac. of Eng., King Mongkut´´s Inst. of Technol. Ladkrabang, Bangkok, Thailand
Abstract :
This paper presents a polarization switchable antenna for UHF RFID Reader. The UHF-RFID has the bandwidth from 920 MHz to 925 MHz, and the center frequency is 922.5 MHz. The antenna is composed of main radiation part and the corner which is separated by a slot. The antenna can switch between circular and linear polarization by shorted or open between the main patch and the corner. The antenna structure is simple because of using the single probe to feed the microstrip antenna. For circular polarization, the pattern is unidirectional beam with the directivity of 8.69 dBic at the center frequency. For linear polarization, the pattern is unidirectional beam with the directivity of 8.67 dBi at the center frequency. The obtained bandwidth is 45 MHz for circular polarization and 27 MHz for linear polarization.
Keywords :
UHF antennas; antenna feeds; antenna radiation patterns; electromagnetic wave polarisation; microstrip antennas; radiofrequency identification; UHF RFID reader; bandwidth 27 MHz; bandwidth 45 MHz; circular polarization switchable antenna; frequency 920 MHz to 925 MHz; linear polarization switchable antenna; microstrip antenna feed; radiation part; unidirectional beam pattern; Antenna measurements; Antennas; ISO standards; Radiofrequency identification; Switches; Microstrip Antenna; Polarization Switchable;
Conference_Titel :
Intelligent Signal Processing and Communications Systems (ISPACS), 2011 International Symposium on
Conference_Location :
Chiang Mai
Print_ISBN :
978-1-4577-2165-6
DOI :
10.1109/ISPACS.2011.6146207
