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Design of RFID Passive Tag Antennas in UHF Band  

Cho Chihyun (School of Electrical and Electronic Engineering, Hongik University)
Choo Hosung (School of Electrical and Electronic Engineering, Hongik University)
Park Ikmo (Department of Electronic and Engineering, Ajou University)
Kim Youngkil (Department of Electronic and Engineering, Ajou University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.9, 2005 , pp. 872-882 More about this Journal
Abstract
In this paper, we examined the operating principle of a passive tag antenna for RFID system in UHF band. Based on the study, we proposed a novel RFID tag antenna which adopts the inductively coupled feeding structure to match antenna impedance to a capacitively loaded commercial tag chip. The proposed tag antenna consists of microstrip lines on a thin PET substrate for low-cost fabrication. The detail structure of the tag antenna were optimized using a full electromagnetic wave simulator of IE3D in conjunction with a Pareto genetic algorithm and the size of the tag antenna can be reduced up to kr=0.27($2 cm^2$). We built some sample antennas and measured the antenna characteristics such as a return loss, an efficiency, and radiation patterns. The readable range of the tag antenna with a commercial RFID system showed about 1 to 3 m.
Keywords
Pareto Genetic Algorithm; Small Antenna; Inductively Coupled Antenna; RFID Antenna;
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