New Miniature Microstrip Antenna Based on Metamaterial for RFID Applications

This paper presents a new dual-band metamaterial monopole antenna for radio frequency identification applications (RFID) in UHF and microwave band. This antenna is designed on an FR4 epoxy substrate with dielectric constant 4.4, loss tangent 0.025 and thickness 1.6mm and fed by 50 Ohms microstrip line. The proposed antenna consists of a rectangular patch incorporated with U slot and a partial ground plane, a split ring resonator (SRR) is inserted on the opposite side of the patch for dual-band operation. The antenna operates at 900MHz and 2.45GHz with a return loss of -33.73 dBi and -38.43 dB respectively. The numerical results show that the input impedance bandwidth of the antenna at the lower frequency band is 87 MHz (0.861GHz-0.948GHz) and in the upper-frequency band is 516MHz (2.255GHz-2.771GHz). The design parameters and performance are analyzed by using CST microwave studio. A prototype of the proposed antenna was fabricated to validate numerical results.