Title :
A small RFID tag antenna to identify metallic objects
Author :
Choi, Wonkyu ; Kim, Jungsuk ; Bae, Ji-Hoon ; Choi, Gilyoung
Author_Institution :
Electron. & Telecommun. Res. Inst. (ETRI), Daejeon
Abstract :
This letter presents the design of a small and low-profile RFID tag antenna in the UHF band that can be stuck to metallic objects. The designed tag antenna which uses a ceramic material as an antenna substrate consists of a radiating patch and microstrip lines for a proximity-coupled feeding structure, which is the structure that can easily obtain impedance matching between an antenna and a tag chip without any additional matching network. The fractional return-loss bandwidth for S11<10 dB and radiation efficiency are about 1% and 40% at 911 MHz, respectively. The read range is approximately from 3 to 4 m when the tag antenna is mounted on a metallic surface.
Keywords :
UHF antennas; antenna accessories; impedance matching; microstrip lines; radiofrequency identification; UHF band; ceramic material; fractional return-loss bandwidth; metallic objects; microstrip lines; proximity-coupled feeding structure; radiating patch; radio frequency identification; small RFID tag antenna; Antenna feeds; Ceramics; Dipole antennas; Impedance; Microstrip antennas; RFID tags; Radiofrequency identification; Resonant frequency; Surface fitting; UHF antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2008. AP-S 2008. IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-2041-4
Electronic_ISBN :
978-1-4244-2042-1
DOI :
10.1109/APS.2008.4619849
