@article {63255,
	title = {Effects of Superstrate Layer on the Resonant Characteristics of Superconducting Rectangular Microstrip Patch Antenna, e-ISSN 1937-8718},
	journal = {Progress In Electromagnetics Research CProgress In Electromagnetics Research C},
	volume = {Volume 62},
	year = {2019},
	month = {2019},
	pages = {pp 57{\textendash}165},
	abstract = {The resonant characteristics of superconducting rectangular microstrip patch antenna witha superstrate layer are investigated using a full-wave spectral analysis in conjunction with the complexresistive boundary condition. The complex surface impedance of superconducting patch is determinedusing London{\textquoteright}s equation and the two-fluid model of Gorter and Casimir. Numerical results using thefull-wave analysis presented here are in excellent agreement with theoretical and experimental resultsavailable in the open literature. Numerical results show that the effect of the superstrate layer on theresonant frequency and half-power bandwidth of the superconducting rectangular patch is stronger thanthat of the structure without superstrate layer as both the thickness and permittivity of the superstrateincrease. Finally, numerical results concerning the effects of the parameters of superstrate-substrateand superconducting patch on the antenna performance are also presented and discussed},
	author = {Sami, Bedra and Tarek, Fortaki}
}
@article {63256,
	title = {Study of an Inverted Rectangular Patch Printed on Anisotropic Substrates (In press), e-ISSN 0974-780X},
	journal = {IETE Journal of ResearchIETE Journal of Research},
	year = {2019},
	month = {2019},
	abstract = {The resonant frequencies and bandwidths of the inverted rectangular patch over anisotropic substrates are investigated in this paper. A rigorous analysis is performed using dyadic Green{\textquoteright}s function formulation in the vector Fourier transform domain. The Galerkin{\textquoteright}s technic is then used in the resolution of the integral equation; the complex resonance frequencies for the TM01 mode are studied with sinusoidal basis functions. The numerical results obtained are compared with previously published numerical results computed by means of the electromagnetic simulator {\textquotedblleft}IE3D software{\textquotedblright}. Good agreement is found in all cases among all sets of results. For an isotropic substrate, it is confirmed that the bandwidth decreases with increasing of air-gap layer for high permittivity and low thickness of the substrate. Also, we show that the resonant frequencies and bandwidths are highly dependent on the permittivity variations alongside the optical axis. Other theoretical results attained display that the resonant frequencies downtrend monotonically with increasing substrate thickness, the diminution being larger for the uniaxial anisotropy of the substrate. Finally, numerical results for the effects of uniaxial anisotropy in the substrate on the radiation of the inverted rectangular microstrip structure are also presented.},
	author = {Sami, Bedra and Randa, Bedra and Siham, Benkouda and Tarek, Fortaki}
}
@article {63582,
	title = {Study of two-layered circular patch using moment method and genetic Algorithms, e-ISSN 2088-8708},
	journal = {International Journal of Electrical \& Computer EngineeringInternational Journal of Electrical \& Computer Engineering},
	volume = {Volume 9},
	year = {2019},
	month = {2019},
	pages = {pp 5368 - 5375},
	abstract = {In this paper, new expressions for the effective radius and fringing capacitance have been derived to predict accurately the resonant frequency of the two-layered circular microstrip patch antenna. These expressions are obtained based on genetic algorithm and the data base is generated using moment method (MOM). The proposed model is very simple, fast, and valid for an entire range of permittivities and thicknesses of two-layered substrate. The present model has been validated by comparing our numerical results obtained for the resonant frequencies with measurements. Finaly, the effect of the two-layered substrate on the resonant charateristics of the circular microstrip patch antenna has been presented.},
	author = {Ahmed, Mahamdi and Siham, Benkouda and Amir, Mounir and Sami, Bedra}
}
@article {64722,
	title = {Analysis of HTS circular patch antennas including radome effects. International Journal of Microwave and Wireless Technologies,e-ISSN 1759-0795},
	journal = {International Journal of Microwave and Wireless TechnologiesInternational Journal of Microwave and Wireless Technologies},
	volume = {Volume 10},
	year = {2018},
	month = {2018},
	pages = {pp 843-850},
	abstract = {In this paper, the resonant frequencies, quality factors and bandwidths of high Tc superconducting circular microstrip patches in the presence of a dielectric superstrate loading have been studied using Galerkin testing procedure in the Hankel transform domain. The exact Green{\textquoteright}s function of the grounded dielectric slab is used to derive an electric field integral equation for the unknown current distribution on the circular disc. Thus, surface waves, as well as space wave radiation, are included in the formulation. London{\textquoteright}s equations and the two-fluid model of Gorter and Casimir are used in the calculation of the complex surface impedance of the superconducting circular disc. Galerkin testing is used in the resolution of the electric field integral equation. Two solutions using two different basis sets to expand the unknown disk currents are developed. The first set of basis functions used is the complete set of transverse magnetic and transverse electric modes of a cylindrical cavity with magnetic side walls. The second set of basis functions used employ Chebyshev polynomials and enforce the current edge condition. The computed values for a wide range of variations of superstrate thickness and dielectric constant are compared with different theoretical and experimental values available in the open literature, showing close agreement. Results are showing that the superstrate parameters should always be kept into account in the design stage of the superconducting microstrip resonators. \&nbsp;},
	author = {Sami, Bedra and Randa, Bedra and Siham, Benkouda and Tarek, Fortaki}
}
@proceedings {64573,
	title = {CAD cavity model analysis of high Tc superconducting rectangular patch printed on anisotropic substrates},
	journal = {5th International Conference on Electrical Engineering - Boumerdes (ICEE-B)},
	year = {2017},
	month = {2017},
	address = {Boumerdes, Algeria},
	abstract = {
	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{\textquoteright}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.

},
	url = {https://ieeexplore.ieee.org/abstract/document/8192168},
	author = {Ahmed, Mahamdi and Sami, Bedra and Randa, Bedra and Siham, Benkouda}
}
@article {64180,
	title = {Efficient CAD Model to Analysis of High Tc Superconducting Circular Microstrip Antenna on Anisotropic Substrates. Advanced Electromagnetics, e-ISSN 2119-0275},
	volume = {Volume 6},
	year = {2017},
	month = {2017},
	pages = {pp 40-45},
	abstract = {In this paper, an electromagnetic approach based on cavity model in conjunction with electromagnetic knowledge was developed. The cavity model combined with London{\textquoteright}s equations and the Gorter-Casimir two-fluid model has been improved to investigate the resonant characteristics of high Tc superconducting circular microstrip patch in the case where the patch is printed on uniaxially anisotropic substrate materials.\&nbsp; Merits 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, numerical results for the dielectric anisotropic substrates effects on the operating frequencies for the case of superconducting circular patch are also presented.},
	author = {Sami, Bedra and Randa, Bedra and Siham, Benkouda and Tarek, Fortaki}
}
@article {64178,
	title = {An efficient study of circular microstrip antenna on suspended and composite substrates, e-ISSN 1572-8137},
	journal = {Journal of Computational ElectronicsJournal of Computational Electronics},
	volume = {Volume 16},
	year = {2017},
	month = {2017},
	pages = {pp 922-2017},
	abstract = {In this paper, an efficient full-wave analysis of a circular microstrip patch printed on suspended and composite substrates is performed using a dyadic Green{\textquoteright}s function formulation. Galerkin{\textquoteright}s technique is used in the resolution of the integral equation of the electric field. The TM set of modes issued, from the magnetic wall cavity model, are used to expand the unknown currents on the circular patch. The radiation patterns are expressed regarding the transforms of the currents. The convergence of the method is proven by calculating the resonant frequencies, half-power bandwidths, and quality factors for several configurations. The computed results are found to be in excellent agreement with those observed in the literature. The numerical results obtained show that the bandwidth increases with the increase in the thickness of the suspended or composite substrates, especially for low permittivity of the second layer. Also, it is demonstrated that the resonant frequencies of the circular microstrip patch on suspended and composite substrates can be adjusted to obtain the maximum operating frequency of the antenna. Finally, the effect of the presence of the second layer under the circular patch on the radiation patterns is also investigated.},
	author = {Sami, Bedra and Siham, Benkouda and Tarek, Fortaki}
}
@article {64296,
	title = {Neurospectral computation for the resonant characteristics of microstrip patch antenna printed on uniaxially anisotropic substrates, e-ISSN 1759-0795},
	journal = {International Journal of Microwave and Wireless TechnologiesInternational Journal of Microwave and Wireless Technologies},
	volume = {Volume 9},
	year = {2017},
	month = {2017},
	pages = {pp 613-620},
	abstract = {Modeling and design of rectangular microstrip patch printed on isotropic or anisotropic substrate are accomplished in this paper. The use of spectral domain method in conjunction with artificial neural networks (ANNs) to compute the resonant characteristics of rectangular microstrip patch printed on isotropic or anisotropic substrates. The moment method implemented in the spectral domain offers good accurateness, but its computational cost is high owing to the evaluation of the slowly decaying integrals and the iterative nature of the solution process. The paper introduces the electromagnetic knowledge combined with ANN in the analysis of rectangular microstrip antenna on uniaxially anisotropic substrate to reduce the complexity of the spectral domain method and to minimize the CPU time necessary to obtain the numerical results. The numerical comparison between neurospectral and conventional moment methods shows significant improvements in time convergence and computational cost. Hence, the use of neurospectral approach presented here as a promising fast technique in the design of microstrip antennas. \&nbsp; \&nbsp;},
	author = {Lamia, Barkat and Sami, Bedra and Tarek, Fortaki and Randa, Bedra}
}
@article {64179,
	title = {Superstrate loading effects on the resonant characteristics of high Tc superconducting circular patch printed on anisotropic materials, e-ISSN 0921-4534},
	journal = {Physica C: Superconductivity and Its ApplicationsPhysica C: Superconductivity and Its Applications},
	volume = {Volume 543},
	year = {2017},
	month = {2017},
	pages = {pp 1-7},
	abstract = {In this paper, the effects of both anisotropies in the substrate and superstrate loading on the resonant frequency and bandwidth of high-Tc superconducting circular microstrip patch in a substrate-superstrate configuration are investigated. A rigorous analysis is performed using a dyadic Galerkin{\textquoteright}s method in the vector Hankel transform domain. Galerkin{\textquoteright}s procedure is employed in the spectral domain where the TM and TE modes of the cylindrical cavity with magnetic side walls are used in the expansion of the disk current. The effect of the superconductivity of the patch is taken into account using the concept of the complex resistive boundary condition. London{\textquoteright}s equations and the two-fluid model of Gorter and Casimir are used in the calculation of the complex surface impedance of the superconducting circular disc. The accuracy of the analysis is tested by comparing the computed results with previously published data for several anisotropic substrate-superstrate materials. Good agreement is found among all sets of results. The numerical results obtained show that important errors can be made in the computation of the resonant frequencies and bandwidths of the superconducting resonators when substrate dielectric anisotropy, and/or superstrate anisotropy are ignored. Other theoretical results obtained show that the superconducting circular microstrip patch on anisotropic substrate-superstrate with properly selected permittivity values along the optical and the non-optical axes combined with optimally chosen structural parameters is more advantageous than the one on isotropic substrate-superstrate by exhibiting wider bandwidth characteristic.},
	author = {Sami, Bedra and Randa, Bedra and Siham, Benkouda and Tarek, Fortaki}
}
@article {65324,
	title = {Analysis of elliptical-disk microstrip patch printed on isotropic or anisotropic substrate materials, e-ISSN 1759-0795},
	journal = {International Journal of Microwave and Wireless TechnologiesInternational Journal of Microwave and Wireless Technologies},
	volume = {Volume 8},
	year = {2016},
	month = {2016},
	pages = {pp. 251-255},
	abstract = {This paper presents a simple approach for accurate determination of the resonant frequency of an elliptical microstrip patch printed on isotropic or anisotropic substrate materials. In this approach, some modifications are made to account for fringe fields, dispersion effects, and losses by calculating effective dimensions, effective permittivity of anisotropy in the layer, and effective loss tangent, respectively. The theoretical resonant frequency results are in very good agreement with the experimental results reported elsewhere. Numerical results show that the change in the resonant frequency of the antenna is due primarily to a small disturbance of the substrate{\textquoteright}s nature. Then the effect of the uniaxial anisotropic materials is a significant parameter and most essential on the microstrip antenna characterization.},
	author = {Randa, Bedra and Sami, Bedra and Tarek, Fortaki}
}
@article {65304,
	title = {High-Tc superconducting rectangular microstrip patch covered with a dielectric layer, e-ISSN 0921-4534},
	journal = {Physica C: Superconductivity and Its ApplicationsPhysica C: Superconductivity and Its Applications},
	volume = {Volume 524},
	year = {2016},
	month = {2016},
	pages = {pp 31-36},
	abstract = {This paper presents a full-wave method to calculate the resonant characteristics of rectangular microstrip antenna with and without dielectric cover, to explain the difference of performance with temperature between superconducting and normal conducting antenna. Especially the characteristics of high temperature superconducting (HTS) antenna were almost ideal around the critical temperature (Tc). The dyadic Green{\textquoteright}s functions of the considered structure are efficiently determined in the vector Fourier transform domain. The effect of the superconductivity of the patch is taken into account using the concept of the complex resistive boundary condition. The computed results are found to be in good agreement with results obtained using other methods. Also, the effects of the superstrate on the resonant frequency and bandwidth of rectangular microstrip patch in a substrate{\textendash}superstrate configuration are investigated. This type of configuration can be used for wider bandwidth by proper selection of superstrate thickness and its dielectric constants.},
	author = {Sami, Bedra and Tarek, Fortaki}
}
@article {65303,
	title = {Resonant and Radiation Characteristics of Rectangular Microstrip Patch Antenna on Suspended-Composite Substrates, ISSN 1054-4887},
	journal = {Applied Computational Electromagnetics Society JournalApplied Computational Electromagnetics Society Journal},
	volume = {volume 31},
	year = {2016},
	month = {2016},
	pages = {pp 138-142},
	abstract = {In this paper, the resonance and radiation characteristics of rectangular microstrip patch printed on suspended and composite substrates are investigated theoretically. The analysis approach is based on the spectral-domain method of moments in conjunction with the stationary phase method. The complex resonant frequency of the microstrip antenna on suspended and composite substrates is studied with sinusoidal functions as basis functions, which show fast numerical convergence. Using a matrix representation of each layer, the far-field pattern of the suspended-composite configuration is efficiently determined by the (TM, TE) representation. The validity of the solution is tested by comparison of the computed results with experimental data. Finally, numerical results for the effects of suspended and composite substrates on the resonant frequency and half-power bandwidth are also presented.},
	author = {Sami, Bedra and Tarek, Fortaki}
}
