Flexible UHF RFID Tag Gain Enhancement using Metamaterial Structure

Abstract

In this paper, we propose a flexible passive RFID tag using a Complementary Split Ring Resonator (CSRR) structure for antenna gain enhancement. The tag is based on a folded dipole antenna and 8 CSRR cells in the same layer, on a polyamide substrate. Simulation results performed in the ANSYS Electronics Desktop software are presented. It has been shown that with the insertion of the metamaterial structure there is a considerable improvement in some parameters of the antenna, such as directivity, efficiency and, consequently, gain. The gain of the antenna increased, approximately, from −6.8 dB to 5.3 dB. In addition, a read range of approximately 24.21 m was obtained at the operating frequency (915 MHz) with the metamaterial-based antenna.