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7 results on '"Touahni, Rajae"'

4. A Novel Dual-band Antenna with L-slot Defective Ground Structure (DGS) and T-shaped Strip for WIMAX /WLAN and ISM Medical Band Applications.

Author

Elhabchi, Mourad, Srifi, Mohamed Nabil, and Touahni, Rajae

Subjects
IEEE 802.16 (Standard), DUAL fluorescence, FLUORESCENCE, ELECTROMAGNETIC casting, COMPUTER simulation
Abstract

A novel printed rectangular slotted patch antenna with defected Ground plane(DGS) for dual-band operations is presented. By embedding a T-shaped strips and defecting L-shaped slot in the ground plane, triple-mode resonances for achieving dual operations bands can be excited for achieving additional resonances. The designed antenna has very small size of 15 x 20 x 0.8mm3 printed on FR4 substrate and operate over the frequency ranges, (3.2-3.6) GHz and (5.02-6.64) GHz suitable for WiMAX (3.5/5.5GHz),WLAN (5.2/5.8GHz) and ISM medical band (5.725-5.82GHz). Simulation results show that the antenna gives an acceptable gain over the operating bands. In addition, effects dimensions of the T-shaped strips and the DGS for this design on the electromagnetic performance are examined and discussed in detail. The antenna was simulated using Computer Simulation Technology Microwave Studio (CST MWS) based on the finite difference time domain (FDTD). Finally, the proposed antenna was fabricated and reflection coefficient parameter was measured to validate against simulation results. [ABSTRACT FROM AUTHOR]

Published
2017

7. Antenna gain and directivity improvement by using metamaterial unit-cell inspired in superstrate with zero refractive index.

Author

ELHABCHI, Mourad, SRIFI, Mohamed Nabil, and TOUAHNI, Rajae

Subjects
DIELECTRIC properties of metamaterials, ANTENNAS (Electronics), UNIT cell, PERMITTIVITY, REFRACTIVE index measurement, IMPEDANCE matching
Abstract

In this paper, a Zero Index Metamaterial (ZIM) is proposed for antenna gain and directivity enhancement. This ZIM is developed, characterized and employed for elliptical UWB operating on the frequency range 3.1Ghz-20GHz. The unique property of the metamaterial gathers the wave radiated from the antenna and collimates it towards the normal direction when used as a superstrate, the effective permittivity and permeability of the (ZIM) are designed to synchronously approach zero. This leads the ZIM to having an effective wave impedance matching with air and near-zero index simultaneously. [ABSTRACT FROM AUTHOR]

Published
2016
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