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Auteur Leila Chouti |
Documents disponibles écrits par cet auteur (2)
Affiner la recherche Interroger des sources externesCaractérisation d’une antenne microbande couplée par une ouverture de forme rectangulaire. Application à la réalisation d’une antenne multibande. / Leila Chouti
Titre : Caractérisation d’une antenne microbande couplée par une ouverture de forme rectangulaire. Application à la réalisation d’une antenne multibande. Type de document : texte imprimé Auteurs : Leila Chouti, Auteur ; Abdelmadjid Benghalia, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 112 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : Antenne microruban antenne microruban couplée par une ouverture méthode des différences finies (FDTD) système MIMO antenne multi bande microstrip antenna aperture microstrip antenna FDTD method MIMO system multiband antenna ھوائیات میكرو شریطیة ھوائیات المیكرو شریطیة المقترنة بفتحة طریقة FDTD
نظام MIMOھوائي متعدد النطاقاتIndex. décimale : 621 Electronique Résumé : The main purpose of this thesis was to study, modeling and design of printed antennas. Three main parts have formed the body of this thesis. In the first part, we have developed two methods for modeling a rectangular microstrip antenna with a rectangular aperture in the ground plane. The first method is based on the determination of hybrid dyadic Green’s functions in the spectral domain, while in the second method, we have applied the finite difference time domain for the analysis of the microstrip antenna. The two methods have been
validated by comparing our numerical results with experimental measurements as well as with results obtained using the HFSS simulation software.
The second part has been devoted to the study of performances of two multi-antennas systems. Each system has eight radiating elements having as a basic element a microstrip patch. The main difference between these two systems lies in the excitation technique, where the radiating elements of the second multi-antenna system have been fed through apertures cut into the ground plane. The performances in terms of adaptation and isolation for these two systems have been discussed. Results concerning the radiation patterns and gain have been also presented.
In the third part of this thesis, our efforts were directed towards the design of a new tri-band triangular monopole antenna structure. A rectangle-shaped aperture has been etched on the radiating element to generate the second resonant frequency. To obtain the third resonant frequency, a pair of symmetrical L-shaped parasitic elements has been added on both sides of the triangular monopole antenna. A coplanar waveguide feeding mechanism has been used to provide good performances on all bands. The CST simulation software has been used in the
optimization of the parameters of the proposed antenna. A prototype of the proposed antenna has been fabricated in the RF laboratory of the INRS in Montreal, Canada.
The simulated results in terms of reflection coefficient and radiation pattern have been compared with experimental measurements and a good agreement has been obtained.
Measured and simulated results demonstrate that the proposed antenna can achieve three desired operating bands, higher isolation characteristic between adjacent bands. A stable gain and a good omnidirectional radiation in the H-plane have also been achieved. As a result, the performances offered by the proposed antenna are very promising for practical WLAN/WiMAX applications.
Diplôme : Doctorat en sciences En ligne : ../theses/electronique/CHO7294.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10909 Caractérisation d’une antenne microbande couplée par une ouverture de forme rectangulaire. Application à la réalisation d’une antenne multibande. [texte imprimé] / Leila Chouti, Auteur ; Abdelmadjid Benghalia, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 112 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : Antenne microruban antenne microruban couplée par une ouverture méthode des différences finies (FDTD) système MIMO antenne multi bande microstrip antenna aperture microstrip antenna FDTD method MIMO system multiband antenna ھوائیات میكرو شریطیة ھوائیات المیكرو شریطیة المقترنة بفتحة طریقة FDTD
نظام MIMOھوائي متعدد النطاقاتIndex. décimale : 621 Electronique Résumé : The main purpose of this thesis was to study, modeling and design of printed antennas. Three main parts have formed the body of this thesis. In the first part, we have developed two methods for modeling a rectangular microstrip antenna with a rectangular aperture in the ground plane. The first method is based on the determination of hybrid dyadic Green’s functions in the spectral domain, while in the second method, we have applied the finite difference time domain for the analysis of the microstrip antenna. The two methods have been
validated by comparing our numerical results with experimental measurements as well as with results obtained using the HFSS simulation software.
The second part has been devoted to the study of performances of two multi-antennas systems. Each system has eight radiating elements having as a basic element a microstrip patch. The main difference between these two systems lies in the excitation technique, where the radiating elements of the second multi-antenna system have been fed through apertures cut into the ground plane. The performances in terms of adaptation and isolation for these two systems have been discussed. Results concerning the radiation patterns and gain have been also presented.
In the third part of this thesis, our efforts were directed towards the design of a new tri-band triangular monopole antenna structure. A rectangle-shaped aperture has been etched on the radiating element to generate the second resonant frequency. To obtain the third resonant frequency, a pair of symmetrical L-shaped parasitic elements has been added on both sides of the triangular monopole antenna. A coplanar waveguide feeding mechanism has been used to provide good performances on all bands. The CST simulation software has been used in the
optimization of the parameters of the proposed antenna. A prototype of the proposed antenna has been fabricated in the RF laboratory of the INRS in Montreal, Canada.
The simulated results in terms of reflection coefficient and radiation pattern have been compared with experimental measurements and a good agreement has been obtained.
Measured and simulated results demonstrate that the proposed antenna can achieve three desired operating bands, higher isolation characteristic between adjacent bands. A stable gain and a good omnidirectional radiation in the H-plane have also been achieved. As a result, the performances offered by the proposed antenna are very promising for practical WLAN/WiMAX applications.
Diplôme : Doctorat en sciences En ligne : ../theses/electronique/CHO7294.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10909 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité CHO/7294 CHO/7294 Thèse Bibliothèque principale Thèses Disponible
Titre : Contribution à l'étude d'antennes imprimées rectangulaires double bande et multi-bandes tenant compte de l'effet de couplage. Type de document : texte imprimé Auteurs : Leila Chouti, Auteur ; Abdelmadjid Benghalia, Directeur de thèse Mention d'édition : 13/01/2009 Editeur : Constantine : Université Mentouri Constantine Année de publication : 2009 Importance : 81 f. Format : 30 cm. Note générale : 01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : Micro-ondes Antennes imprimées Effet de couplage Index. décimale : 621 Electronique Résumé : In this memory, we are interested in the characterization of a rectangular microstrip antenna. Initially we use an integral method, method of moments which enabled us to exploit the spectral tensor of Green. The resolution of the integral equations of the electric field by the procedure of Galerkin makes it possible to lead to a system of equations homogenous from which we calculate the frequency of resonance, the others parameters of the micro strip antenna like; the factor of quality, the band width and the radiated field, are deduced.
An analysis of printed antennas feeded and disposed on periodic etwork, while taking account of the effect of coupling, was treated.
The coupling between two elements was taken into account. The study was extended to the calculation of the coupling between several elements in a general configuration. The diagram of radiation of a network of antennas microrubans depends on the determination of the current of each antenna supply; we employ the method of moments to compute the matrix potantiel and mutual impedance between microstrip
antennas.The numerical results obtained, show that the coupling is very significant when the two antennas are close, but when the distance is large, the coefficient of coupling east decreases.Note de contenu : Annexe. Diplôme : Magistère En ligne : ../theses/electronique/CHO5273.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=2811 Contribution à l'étude d'antennes imprimées rectangulaires double bande et multi-bandes tenant compte de l'effet de couplage. [texte imprimé] / Leila Chouti, Auteur ; Abdelmadjid Benghalia, Directeur de thèse . - 13/01/2009 . - Constantine : Université Mentouri Constantine, 2009 . - 81 f. ; 30 cm.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : Micro-ondes Antennes imprimées Effet de couplage Index. décimale : 621 Electronique Résumé : In this memory, we are interested in the characterization of a rectangular microstrip antenna. Initially we use an integral method, method of moments which enabled us to exploit the spectral tensor of Green. The resolution of the integral equations of the electric field by the procedure of Galerkin makes it possible to lead to a system of equations homogenous from which we calculate the frequency of resonance, the others parameters of the micro strip antenna like; the factor of quality, the band width and the radiated field, are deduced.
An analysis of printed antennas feeded and disposed on periodic etwork, while taking account of the effect of coupling, was treated.
The coupling between two elements was taken into account. The study was extended to the calculation of the coupling between several elements in a general configuration. The diagram of radiation of a network of antennas microrubans depends on the determination of the current of each antenna supply; we employ the method of moments to compute the matrix potantiel and mutual impedance between microstrip
antennas.The numerical results obtained, show that the coupling is very significant when the two antennas are close, but when the distance is large, the coefficient of coupling east decreases.Note de contenu : Annexe. Diplôme : Magistère En ligne : ../theses/electronique/CHO5273.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=2811 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité CHO/5273 CHO/5273 Thèse Bibliothèque principale Thèses Disponible
