<span lang="EN-US">In this paper, we present a new dual band metamaterial printed antenna for radio frequency identification applications. The proposed antenna consists of two L-shaped slot in the radiating element for dual band operation and a complementary split ring resonator etched from the ground plane for size miniaturization. This antenna is designed and optimized by CST microwave studio on FR-4 substrate with thickness of 1.6 mm, dielectric constant of 4.4 and tangent loss of 0.025. A microstrip line with characteristic impedance of 50 ohms is used to feed this antenna. A prototype of the proposed antenna is fabricated to validate the simulation results. The measured and simulated results are in good agreement. </span>

The development of miniature antennas for bio-medical applications has attracted the attention of many researchers in the last years. In this letter, we provide a miniature antenna for the RFID tag for identifying patients in African and European hospitals. The proposed antenna is designed on a flexible silicon substrate with a relative dielectric constant of 11.9 and a thickness of 1.6mm. An in-depth study of the proposed wearable antenna was made in free space and on human tissue. The achieved results showed good performance in terms of miniaturization, bandwidth, impedance matching and, reading distance. The presented tag antenna is designed and simulated by using CST-MWS solver and the results were validated by HFSS and both results are in good agreement.

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In this article, we propose a new design of a miniature antenna for integration into the RFID (Radio Frequency Identification) reader and the RFID transponder to operate in the Moroccan and European UHF (Ultra High Frequency) band. The proposed antenna is designed on a flexible PET (Polyethylene Terephthalate) substrate. The proposed tag consists of a microchip and a dipole antenna loaded metamaterial based on a spiral split ring resonator which has a negative magnetic permeability in the UHF RFID Moroccan and European band. The metamaterial unit cell is used to reduce the antenna size and a double T-matching structure is inserted to match the dipole antenna with the "Monza 1a" chip. The antenna yields an omnidirectional radiation patterns and a gain of 2.2 dBi at the central frequency. The designed antenna has a small size about 63 mm x 14 mm which is suitable for paper boxes and bottles labelling.

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