Otman El Mrabet

A COMPACT SPLIT RING RESONATOR ANTENNA FOR WIRELESS COMMUNICATION SYSTEMS

In this paper, we report a new design of a compact antenna based on the use of split ring resonator (SRR). The designed antenna consists of two SRRs, with the same geometrical parameters, printed symmetrically on both sides of the dielectric substrate. Excitation of the SRR element is performed by adequately placing the access microstrip lines with respect to the conflnement plane of the split rings. The resonance frequency of the antenna is essentially deflned by geometrical parameters of the SRR, which makes it suitable for a broad range of applications spanning from mobile terminals to WLAN and WPAN systems. The flnal result is low proflle, and can be easily integrated with other RF front-end circuits in a PCB.

An efficient algorithm for the global modeling of RF and microwave circuits using a reduced nonlinear lumped network (RNL/sup 2/N)-FDTD approach

In this letter, we present an efficient and simple reduced nonlinear lumped network (RNL/sup 2/N)-FDTD method for the global modeling of RF and microwave circuits. This method is a simplified version of the original nonlinear lumped network (NL/sup 2/N)-FDTD approach, which does not require a complicated precalculation and a huge back-storage compared to the former version.

A coplanar waveguide-fed printed antenna with complementary split ring resonator for wireless communication systems

In this paper, we report a new design of a compact coplanar waveguide-fed printed antenna with complementary split ring resonator (CSRR). The designed antenna consists of two CSRRs, with same geometrical parameters, printed symmetrically into the top layer. The overall volume of the proposed antenna is only 30 × 20 × 0.8 mm3 (0.58 λ0 × 0.39 λ0 × 0.015 λ0), where λ0 is the wavelength of the simulated resonance frequency. The resonance frequency of the antenna is essentially defined by geometrical parameters of the CSRR, which makes it suitable for various wireless communication systems. The characteristics of the proposed antenna have been investigated using simulation software CST Microwave Studio and experimental results. The measured and simulated results show good agreement, providing a simple and low-cost design.

TRANSMISSION PROPERTIES OF STACKED SRR METASURFACES IN FREE SPACE

In this paper, transmission properties of stacked split ring resonators metasurfaces in free space and under normal incidence are investigated experimentally and numerically. Emphasis is put on studying the interaction between adjacent SRRs metasurfaces. The thorough analysis of the electromagnetic flelds shows that both magnetic and electric coupling can occur between adjacents metasurfaces for vertical and horizontal polarization. In addition, we found that all propagating bands within our spectral window (up to 20GHz) support right-handed behaviour. Both simulation and experiment results in the microwave regime are in good agreement.

Planar horn antenna: Application of periodic stacked subwavelength hole array with metamaterials proprieties

In this paper, we study a planar horn antenna fed by a rectangular waveguide operating in the fundamental mode. The aim of this work is to enhance gain by periodic stacked subwavelengh hole array. We applied several types of holes with different thicknesses of the metal plate and with varied distance between the periodic stacked subwavelength hole array and the antenna. We found a good improvement of gain from 6 to 17.5dB in some cases. We also showed that the directivity of the antenna is good in the case of transverse resonance.

Dielectric Substrates Anisotropy Effects on the Characteristics of Microstrip Structures

In this paper, we present an extension of the 3-D FDTD method based on D, E, B and H fields to handle arbitrary anisotropic media characterized by both a permittivity and a permeability tensors. This analysis was not possible for many FDTD simulators due to the lack of convenient absorbing boundary conditions (ABCs). Using the FDTD Method with Generalized Materialindependent perfectly matched-Layer (GMIPLM) ABCs, based on the unsplit formulation, the behavior of the characteristics of microstrip structures printed on general anisotropic dielectric substrates is studied as a function of the optical axis rotation angle of this substrate.