Title :
Size Reduction in UHF Band RFID Tag Antenna Based on Circular Loop Antenna
Author :
Ryu, Hong-Kyun ; Woo, Jong-Myung
Author_Institution :
Dept. of Radio Sci. & Eng., Chungnam Nat. Univ., Daejeon
Abstract :
In this paper, small-sized RFID tag antenna is designed and fabricated based on the circular loop antenna used in UHF band (860-960 MHz). The tag antenna with its center frequency at 911.25 MHz (wave length lambda: 329 mm) adopts a parallel transmission line feed method to match the impedance and reduces its size using a stub. As a result, the antenna (diameter lambda: 54 mm) with 15 stubs reduces its size up to 69.6% compared with the one without any stub. The measured return loss is -9.942 dB, -3 dB bandwidth is 84.35 MHz(9.26%) and the gain in z-x plane is -0.37 dBd. The radiation pattern shows a magnetic dipole antenna characteristic and omnidirectional pattern in horizontal plane
Keywords :
UHF antennas; antenna feeds; antenna radiation patterns; dipole antennas; loop antennas; radiofrequency identification; -9.942 dB; 15 mm; 329 mm; 84.35 MHz; 860 to 960 MHz; UHF band RFID tag antenna; circular loop antenna; horizontal plane; magnetic dipole antenna characteristic; omnidirectional pattern; parallel transmission line feed method; radiation pattern; size reduction; Antenna feeds; Antenna measurements; Dipole antennas; Frequency; Gain measurement; Impedance; RFID tags; Transmission line antennas; Transmission line measurements; UHF antennas;
Conference_Titel :
Applied Electromagnetics and Communications, 2005. ICECom 2005. 18th International Conference on
Conference_Location :
Dubrovnik
Print_ISBN :
953-6037-44-0
DOI :
10.1109/ICECOM.2005.204944
