Title :
Circularly polarized RFID tag for metal surface mount
Author :
Jing-Lun Jheng ; Horng-Dean Chen ; Shang-Huang Kuo ; Hui-Wen Yang
Author_Institution :
Dept. of Optoelectron. & Commun. Eng., Nat. Kaohsiung Normal Univ., Kaohsiung, Taiwan
Abstract :
A passive UHF band RFID tag antenna design is presented here. To allow circular polarization (CP) radiation, compact size, and metal surface mount characteristics, the radiating square patch is loaded with two pairs of unequal slits, while a quarter-wavelength microstrip line connected to a tag-chip and terminated by a short-circuited stub is used to excite the radiating patch. The 10 dB impedance bandwidth of the tag antenna is measured to be 31 MHz (896-927 MHz), while its 3 dB CP bandwidth is 6 MHz (911-917 MHz). Further experiment has demonstrated that the proposed tag antenna can provide better reading distance when mounted on a metallic surface as compared with the free-space condition.
Keywords :
UHF antennas; antenna radiation patterns; electric impedance; electromagnetic wave polarisation; metals; microstrip antennas; microstrip lines; radiofrequency identification; surface mount technology; CP bandwidth; CP radiation; circular polarization; circularly polarized RFID tag; compact size; frequency 31 MHz; frequency 6 MHz; frequency 896 MHz to 927 MHz; impedance bandwidth; metal surface mount; passive UHF band RFID tag antenna design; quarter-wavelength microstrip line; radiating patch; radiating square patch; reading distance; short-circuited stub; tag-chip; unequal slit; Antenna measurements; Impedance; Metals; Radiofrequency identification; Surface impedance; UHF antennas; RFID; UHF band; circular polarization; tag antenna;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2012 Asia-Pacific
Conference_Location :
Kaohsiung
Print_ISBN :
978-1-4577-1330-9
Electronic_ISBN :
978-1-4577-1331-6
DOI :
10.1109/APMC.2012.6421817
