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In this work, a novel design of a Microstrip Low-pass filter based on metamaterial square split ring resonators (SRRs) is proposed. The SRRs has been added to obtain a reduced size and high performances. The filter is designed on an FR-4 substrate having a thickness of 1.6mm, a dielectric constant of 4.4 and loss tangent of 0.025. The proposed low-pass filter is characterized by a cutoff frequency of 2.4 GHz and an attenuation level below than -20dB in the stopband. The LPF is designed, simulated and optimized by using two electromagnetic solvers CST microwave studio and ADS. The computed results obtained by both solvers are in good agreement. The total surface area of the proposed circuit is 18x18mm2 excluding the feed line, its size is miniaturized by 40% compared to the conventional filter. The experimental results illustrate that the filter achieves very good electrical performances in the passband with a low insertion loss of 0.2 dB. Moreover, a suppression level can reach more than 35 dB in the rejected band.

This paper proposes a novel compact band-stop filter based on

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.

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.