Analysis and design of a UHF RFID tag antenna with a Split Ring Resonator

In this paper, the UHF RFID tag antenna which has a SRR as a radiating part and inductively coupled feeding method are analyzed and designed. By using a SRR, the antenna size can be reduced and using an inductively coupled feeding method, we can obtain a wide bandwidth and a simple matching technique to directly attach to a tag chip. Also equivalent circuit model of the tag antenna is presented and unknown variables are analyzed and checked. Therefore the tag antenna can be designed for various tag chips and frequency ranges.