Browsing by Author "Benmeddour, Fadila"

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    IMPROVING THE PERFORMANCES OF A HIGH TC SUPERCONDUCTING CIRCULAR MICROSTRIP AN- TENNA WITH MULTILAYERED CONFIGURATION AND ANISOTROPIC DIELECTRICS
    (Université de M'sila , univ-msila.dz, 2010-12) Benmeddour, Fadila; Bouttout, F
    The moment method technique has been improved to in- vestigate the scattering properties of high Tc superconducting circular antennas with anisotropic substrate in multi-layered con¯guration. In this method, the electric ¯eld integral equation for a current element on a grounded dielectric slab of in¯nite extent was developed by basis functions involving Chebyshev polynomials. An improved analytical model is presented taking into account anisotropic substrate, super- conducting material for the circular patch and multilayered structure. To validate the theoretical results, an experimental study has been performed for a perfectly conducting circular patch on a single layer, with and without air gap. Good agreements were obtained between our theory and measurements. E®ects of temperature and thicknessof a superconducting ¯lm are also reported and discussed. The perfor- mances of high Tc superconducting circular antennas were improved by the use of uniaxial anisotropy substrate and multilayer con¯guration.
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    Resonant Characteristics of Circular HTC Superconducting Printed Antenna Covered with a Dielectric Layer
    (Université de M'sila , univ-msila.dz, 2018-09-18) Benmeddour, Fadila; Christophe, Dumond; Kenane, Elhadi
    Effects of a superstrate layer on the resonant frequency and bandwidth of a high Tc superconducting (HTS) circular printed patch are investigated in this paper. For that, a rigorous full-wave spectral analysis of superconducting patch in multilayer configuration is described. In such an approach, the spectral dyadic Green’s function which relates the tangential electric field and currents at various conductor planes should be determined. Integral equations are solved by a Galerkin’s moment method procedure, and the complex resonance frequencies are studied with basis functions involving Chebyshev polynomials in conjunction with the complex resistive boundary condition. To include the superconductivity of the disc, its complex surface impedance is determined by using London’s equation and the model of Gorter and Casimir. Numerical results are compared with experimental results of literature as well as with the most recent published calculations using different methods. A very good agreement is obtained. Finally, superstrate loading effects are presented and discussed showing interesting enhancement on the resonant characteristics of the superconducting antenna using combinations of Chebyshev polynomials as set of basis functions.