Title :
High frequency ratio antenna for RFID tags
Author :
Kuo, Jieh-Sen ; Wang, Jyun-Jie ; Huang, Chih-Yu
Author_Institution :
Dept. of Electron. Eng., Kao-Yuan Univ., Kaohsiung
Abstract :
A novel high frequency ratio of about 180 for dual-frequency radio frequency identification (RFID) antenna with two different operation mechanisms (near field and far field operation) is proposed. The proposed antenna is obtained by printing a rectangular-spiral-shaped and a meander-shaped line, which is placed above on a rectangular microwave substrate as a RFID tag´s antenna where its ground plane is at the bottom of substrate. The proposed antenna is fed by a 50 Omega microstrip line printed on the same substrate, and the antenna´s two resonant frequencies can be excited with good impedance matching. Closer to omni-directional radiation patterns and the lower cross-polarization levels (at least 25-dB) are also obtained
Keywords :
antenna feeds; antenna radiation patterns; electromagnetic wave polarisation; impedance matching; microstrip lines; multifrequency antennas; radiofrequency identification; RFID tag antenna; cross-polarization levels; dual-frequency radio frequency identification antenna; high frequency ratio antenna; impedance matching; meander-shaped line; microstrip line; omni-directional radiation patterns; rectangular microwave substrate; rectangular-spiral-shaped line; resonant frequencies; Antenna radiation patterns; Feeds; Impedance matching; Microstrip antennas; Microwave antennas; Printing; Prototypes; RFID tags; Radiofrequency identification; Resonant frequency;
Conference_Titel :
Antenna Technology: Small and Smart Antennas Metamaterials and Applications, 2007. IWAT '07. International Workshop on
Conference_Location :
Cambridge
Print_ISBN :
1-4244-1088-6
Electronic_ISBN :
1-4244-1088-6
DOI :
10.1109/IWAT.2007.370132
