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Browsing scientific events by Author "Bedra Sami"

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    Artificial Neural Network Model Analysis of Tunable Circular Microstrip Patch Antenna
    (IEEE Xplore, 2019 International Conference on Advanced Systems and Emergent Technologies (IC_ASET), 2019) Bedra Sami
    In this paper, in order to evaluate the resonant frequency of tunable circular microstrip patch with a fast and accurate model, neural networks are introduced in the theoretical analysis. The obtained model is very suitable for the CAD of microstrip patch antennas. The output of the artificial neuronal network which is the resonant frequency is shown to be very close to the experimental results reported elsewhere. Finally, the influence of the air separation on the operating frequency of the circular disc is investigated.
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    CAD cavity model analysis of high Tc superconducting rectangular patch printed on anisotropic substrates
    (IEEE Xplore, 5th International Conference on Electrical Engineering-Boumerdes (ICEE-B), 2017) Bedra Sami
    This paper, present the resonant and the radiation characteristics of superconducting rectangular microstrip antenna printed on uniaxailly anisotropic substrate using an electromagnetic approach based on cavity model in conjunction with electromagnetic knowledge. The cavity model combined with London's equations and the Gorter-Casimir two-fluid model has been improved to investigate the resonant characteristics as well as the radiation patterns of high Tc superconducting rectangular microstrip patch in the case where the patch is printed on uniaxially anisotropic substrate materials. The most advantage of our extended model include low computational cost and mathematical simplify. The numerical simulation of this modeling shows excellent agreement with experimental results available in the literature. Finally, radiation patterns of superconducting rectangular patch on anisotropic substrate are also presented.
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    Fast and Accurate Model to Determine the Resonant Characteristics of Elliptical Microstrip Patch Antenna
    (IEEE Xplore, 2019 International Conference on Advanced Systems and Emergent Technologies (IC_ASET), 2019) Bedra Sami
    In this work, artificial neural networks are used in the design of a microstrip antenna of elliptical geometry. We propose two neural models. In the first one, the outputs of the problem are the patch size and the resonant frequency for even modes. In the reverse side of the problem, the resonant frequencies for both even and odd modes are obtained in terms of the effective semi-major axis, eccentricity of elliptical patch, the thickness and the effective relative permittivity of the dielectric substrate. To enhance the accuracy of the two models, measurements have been included in the training stage. The two proposed models are very adequate for a fast and accurate estimation of the characteristics of the elliptical microstrip antenna.
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    Resonant Frequency of Tunable Microstrip Ring Antenna Printed on Isotropic or Uniaxially Anisotropic Substrate
    (Advanced Electromagnetics, 2013) Bedra Sami
    In this study, the resonant frequency of annular ring microstrip resonator with uniaxial anisotropic substrate and air gap layer is analyzed. The cavity model for simple ring microstrip antenna is extended with some modifications for the tunable geometry taking into account the anisotropy in the layer. The theoretical resonant frequency results are in very good agreement with the experimental results reported elsewhere. The air gap tuning effect on the resonant characteristics is also investigated for fundamental and higher order modes.
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    Study of Superconducting Equilateral Triangular Patch printed on Anisotropic Dielectric Substrates
    (IEEE Xplore, 2022) Bedra Sami
    The aim of this manuscript is the analysis of an equilateral triangular patch antenna (ETPA) based on superconducting patches using the cavity model and the electromagnetic knowledge in conjunction with the boundary conditions of the complex resistivity. The present method is chosen for the reason that, in contrast to precise techniques, it affords an improved qualitative thoughtful besides it requiring straightforward mathematical formulas. The obtained numerical results are presented for the dominant mode as well as the higher-order modes. A parametric study is carried out in order to study the influence of some physical and electrical parameters on the antenna performance taking in consideration the uniaxial anisotropy in the dielectric substrates. The obtained data of all the structures are evaluated with the calculated and measurement data mentioned in the literature.