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Radiation efficiency improvement of RFID patch antenna using metamaterials

A new design of a periodic Metamaterials on the radiating patch antenna is presented in this paper. This method is used to improve the total radiation efficiency and optimize return loss S11 at resonance frequency of RFID rectangular patch antenna. Based on the simulation results, we found that the proposed metamaterials antenna has a maximum radiation efficiency of 95%, higher gain of 7dB, very narrow bandwidth of 40 MHZ and a better adaptation of −28dB in the operating frequency.