Summary
International Symposium on Antennas and Propagation
2011
Session Number:FrP2
Session:
Number:FrP2-31
UHF-RFID Tag Antenna with Rectangular Loops
P. Wongsiritorn, T. Pumpoung, C. Phongcharoenpanich, S. Kosulvit,
pp.-
Publication Date:2011/10/25
Online ISSN:2188-5079
Summary:
The feeding loop and the parasitic-line with rectangular loop technique is presented to minimize a size of a UHF passive tag antenna at the operating frequency of 920-925 MHz, corresponding to the standard of UHF RFID in Thailand. The electrical size of the proposed tag antenna is approximately 0.03 λ0 x 0.24 λ0 . It is designed for NXP G2XL IC chip with the impedance of 21.29-j191.7 ? at the frequency of 922.5 MHz. For the simulation results, the proposed tag antenna has omnidirectional pattern, the power transmission is around 98.75 % at the center frequency, and the gain is 1.19 dBi. The prototype antenna is fabricated on the FR4 substrate (εr = 4.3 ) with thickness of 0.25 mm. The maximum read range was measured by 4 W EIRP reader which obtains 7 m.