Papers by Abdellatif Slimani
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abdellatif slimani 1 , saad dosse bennani 2 , ali el alami 3 and mohamed amellal 4 A 4-8 GHz ultr... more abdellatif slimani 1 , saad dosse bennani 2 , ali el alami 3 and mohamed amellal 4 A 4-8 GHz ultra wide band microstrip array antennas with improved gain for weather Radar applications was designed and fabricated. The microstrip radiating elements of the proposed array antennas are powered using a T-junction power divider with quarter wave-transformer impedance for a best matching. The design of this array antennas is based on the geometry of a linear array antennas well studied [ref (8)], which is based on minimizing of the electromagnetic (EM) coupling between the radiating elements and as decreasing the number of side lobes. The array antennas with dimension of (110 × 214 × 1.58 mm 3) is fabricated on FR-4 epoxy dielectric with relative permittivity of 4.4 and thickness h ¼ 1.58 mm, it is performed in the full-wave EM solver High Frequency Structure Simulator, CST and verified by measurement. The proposed broadband array antennas show a better performance than the references antennas in deferent parameter which cited after.
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A miniaturized ultra wideband (UWB) planar array antennas for C-band aircraft weather RADAR appli... more A miniaturized ultra wideband (UWB) planar array antennas for C-band aircraft weather RADAR applications is presented. Firstly, the effect of the ground plane is studied. Later, the realization and experimental validation of the geometry that has an UWB characteristic are discussed. This array antennas is composed of a twenty-four radiating element that is etched onto FR-4 substrate with an overall size of 162 × 100 × 1 58 mm 3 and a dielectric constant of ε r = 4 4. The results show that this miniaturized array antennas gives us a bandwidth which is about 115% and a gain greater than 13 dB which are required in aircraft weather radar applications.
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The goal of this paper is to design and develop of an ultra-wideband (UWB) hybrid coupler with a ... more The goal of this paper is to design and develop of an ultra-wideband (UWB) hybrid coupler with a variable phase shift (90 degree to 180 degree and vice-versa) which operates around the resonant frequency of 3.8 GHz required for 5G applications. The design approach is based on the microstrip waveguide technique with localized lumped elements to control the phase shift between outputs ports. The proposed coupler is planar etched onto a Rogers RT substrate with an overall size of 50 × 42 × 1.6 mm 3 and dielectric constant =. . The performance of the coupler can be seen from its important characteristics: Adaptation, Coupling, Isolation and Phase shifter.
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Papers by Abdellatif Slimani