Analysis and Design of a Compact SSRR for Passive RFID Tag Antenna.

In this paper, a small long read range tag antenna based on single split sing-resonator is proposed. This new structure consists of two elements, one acting as a radiating body of the SSRR part which is represented in the outer ring and the other as a broadside coupling part which is represented by interdigital tracks. The antenna miniaturization is achieved by embedding the interdigital tracks inside the SSRR. This technique lengthens the current path and in consequence reduces the antenna size. The proposed tag which is simulated using CST Microwave Studio has a compact size of 20 × 20 × 0.49 mm3 with the peak read range is greater than 9m at UHF European band (865-868MHz). This tag has the advantages of low cost, small size, lightweight, and simple to design. The new approach could be used in RFID application which requires a compact size antenna.