Reading distance extension of original RFID reader with technique of metamaterial structure

This paper presents the application of metamaterial structure for improving the gain of antenna to extend the reading distance of UHF RFID reader without any modifying of the original reader. The proposed structure of metamaterial is designed on the theory of Spilt Ring Resonator (SRR), which located in front of such the RFID reader, while the back side of reader is blocked with a metallic sheet as reflector. At last, we found that the proposed structure of metamaterial can provide the gain around 9.16 dB when compared to the original one (around 1.84 dB).