3 résultat(s) recherche sur le tag 'FDTD method'    

Conception des filtres optiques a base de cristaux photoniques pour application dans les routeurs optiques dans les reseaux de telecomunications optiques / Abdelali Boudissa    

Public ISBD Titre : Conception des filtres optiques a base de cristaux photoniques pour application dans les routeurs optiques dans les reseaux de telecomunications optiques Type de document : texte imprimé Auteurs : Abdelali Boudissa, Auteur ; Malek Benslama, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2013 Importance : 87 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Tags : Cristaux photoniques  couplage cavité-guide d’onde  cavité résonante  filtre optique  Filtre Passe Bande  Channel Drop Filter  la méthode FDTD  la méthode PWE  Photonic crystal  coupled cavity  waveguides  resonant cavity  optical filter  Band Pass Filter  FDTD method  PWE method  ???????? ???????  ?????? ??????  ????? ????  ???? ????  ??? ??????  ?????PW  ?????FDTD  ???? ???? ???? Index. décimale : 621 Electronique Résumé : The implanting of optical routers in telecommunication optical network necessitates the modeling constituent’s amounts and approvals which encircle the considered router. For it, in this work, we investigate three types of filters with base 2D photonic crystals. The first, it is a narrow band optical filter, this system is constituted with two waves guides obtained by omitting one row of holes of the photonic crystal, coupled among them by a resonant cavity formed by a point of defect in the crystal. Near the resonant frequency (??a/2πc = 0.38), light from the input waveguide can couple into the cavity, and the cavity in turn can couple into the output waveguide, is that the peak transmission is precisely 100%.Then a Band Pass Filter is proposed, the out put transmission spectra of our filter covered three band. Band I covers the wavelength range from 1.331 to 1.355 μm has 86% of transmission power, Band II, from 1.390 to 1.427 μm, has 98% of the transmission power and Band III from 1.46 to 1.507 μm, and has 27% of the transmission power. The full width at half maximum bandwidth of these bands is 9.7, 13.1 and 16.4 nm,respectively. And finally a new constitution of “Channel Drop Filter " is simulated, it consists of two waveguides bends coupled among them by linear resonant cavity. The power dropped from the input waveguide bend into the drop channel at 1550 nm (the resonant frequency)is about 89%; the power transferred to the other channels is less than 5%. The Band of out put transmission spectra of the drop channel cover the wavelength range from 1505 to 1600 nm and the bandwidth is about 12.7 nm and the Q factor is 122. The temporal and spectral behavior of the device is studied using two dimensional Finite Difference Time Domain Method (2D-FDTD) and Plane Wave Expansion (PWE) methods respectively. Diplôme : Doctorat en sciences En ligne : ../theses/electronique/BOU6325.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=6291 Conception des filtres optiques a base de cristaux photoniques pour application dans les routeurs optiques dans les reseaux de telecomunications optiques [texte imprimé] / Abdelali Boudissa, Auteur ; Malek Benslama, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2013 . - 87 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Tags : Cristaux photoniques  couplage cavité-guide d’onde  cavité résonante  filtre optique  Filtre Passe Bande  Channel Drop Filter  la méthode FDTD  la méthode PWE  Photonic crystal  coupled cavity  waveguides  resonant cavity  optical filter  Band Pass Filter  FDTD method  PWE method  ???????? ???????  ?????? ??????  ????? ????  ???? ????  ??? ??????  ?????PW  ?????FDTD  ???? ???? ???? Index. décimale : 621 Electronique Résumé : The implanting of optical routers in telecommunication optical network necessitates the modeling constituent’s amounts and approvals which encircle the considered router. For it, in this work, we investigate three types of filters with base 2D photonic crystals. The first, it is a narrow band optical filter, this system is constituted with two waves guides obtained by omitting one row of holes of the photonic crystal, coupled among them by a resonant cavity formed by a point of defect in the crystal. Near the resonant frequency (??a/2πc = 0.38), light from the input waveguide can couple into the cavity, and the cavity in turn can couple into the output waveguide, is that the peak transmission is precisely 100%.Then a Band Pass Filter is proposed, the out put transmission spectra of our filter covered three band. Band I covers the wavelength range from 1.331 to 1.355 μm has 86% of transmission power, Band II, from 1.390 to 1.427 μm, has 98% of the transmission power and Band III from 1.46 to 1.507 μm, and has 27% of the transmission power. The full width at half maximum bandwidth of these bands is 9.7, 13.1 and 16.4 nm,respectively. And finally a new constitution of “Channel Drop Filter " is simulated, it consists of two waveguides bends coupled among them by linear resonant cavity. The power dropped from the input waveguide bend into the drop channel at 1550 nm (the resonant frequency)is about 89%; the power transferred to the other channels is less than 5%. The Band of out put transmission spectra of the drop channel cover the wavelength range from 1505 to 1600 nm and the bandwidth is about 12.7 nm and the Q factor is 122. The temporal and spectral behavior of the device is studied using two dimensional Finite Difference Time Domain Method (2D-FDTD) and Plane Wave Expansion (PWE) methods respectively. Diplôme : Doctorat en sciences En ligne : ../theses/electronique/BOU6325.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=6291

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Etude theorique des materiaux a bandes interdites photoniques bidimensionnels / Feida Bougriou  

Public ISBD Titre : Etude theorique des materiaux a bandes interdites photoniques bidimensionnels : applications dans le domaine du guidage optique et la detection Type de document : texte imprimé Auteurs : Feida Bougriou, Auteur ; Touraya Bouchemat -Boumaza, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2013 Importance : 158 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Tags : cristaux photoniques  guide d'ondes à CP  guides virages  Senseur à haute sensibilité  la méthode FDTD  la méthode PWE  Photonic crystal  bend waveguide  PC waveguide  PC sensor  High sensitivity  FDTD method  PWE method  ???????? ?????????  ???? ?????? ?? ???????? ?????????  ???? ?????? ???????  ????? ?????????  ???????? ???????  ????? FDTD  ????? PWE FDTD Index. décimale : 621 Electronique Résumé : Photonic crystals are nanostructured materials with submicron feature sizes allow unprecedented control of light confinement and enable the miniaturization of main optical functions. Precisely, this thesis is a body of work that builds on the design and development of new components based on photonic crystals for applications in light guiding and high sensitivity detection, using a method based on solving Maxwell's equations finite difference in the 2D-FDTD dimensional time domain. The single line defect photonic crystal waveguide is one of the devices that have been widely explored. Most photonic crystal waveguide structures are designed and fabricated in triangular lattice with circular holes. We designed a single row W1 triangular lattice with a judicious choice of parameters guide. We evaluated the transmission in the guide and we got a maximum transmission about of 60% on the entire band related to the PBG. Another type of guide has been designed, it is the bend guide W1 triangular lattice, by optimizing the topology of the bend, we have shown that the transmission bend circuit is much improved over a wide range. PC waveguide is one class of PC devices that has been demonstrated for RI (refractive index) measurements. For the development of two dimensional reconfigurable photonic circuits, we propose an RI sensor based on single line PCW structure. When the PC’s air holes are full of homogenous de-ionized water, the wavelength position of band edges of this sensor will shift accordingly due to the variation of RI. The sensor is sensitive to the change of RI in the air hole and it can be optimized to realize high sensitivity,wide measurement range and improved transmission. It has been observed that a 306 nm wavelength position of the lower band edge shift was observed corresponding to a sensitivity of more than 927 nm/RIU (refractive index nit). Diplôme : Doctorat en sciences En ligne : ../theses/electronique/BOU6431.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9455 Etude theorique des materiaux a bandes interdites photoniques bidimensionnels : applications dans le domaine du guidage optique et la detection [texte imprimé] / Feida Bougriou, Auteur ; Touraya Bouchemat -Boumaza, Directeur de thèse . - constantine (Route ain el bey, Algérie) : Université Constantine 1, 2013 . - 158 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Tags : cristaux photoniques  guide d'ondes à CP  guides virages  Senseur à haute sensibilité  la méthode FDTD  la méthode PWE  Photonic crystal  bend waveguide  PC waveguide  PC sensor  High sensitivity  FDTD method  PWE method  ???????? ?????????  ???? ?????? ?? ???????? ?????????  ???? ?????? ???????  ????? ?????????  ???????? ???????  ????? FDTD  ????? PWE FDTD Index. décimale : 621 Electronique Résumé : Photonic crystals are nanostructured materials with submicron feature sizes allow unprecedented control of light confinement and enable the miniaturization of main optical functions. Precisely, this thesis is a body of work that builds on the design and development of new components based on photonic crystals for applications in light guiding and high sensitivity detection, using a method based on solving Maxwell's equations finite difference in the 2D-FDTD dimensional time domain. The single line defect photonic crystal waveguide is one of the devices that have been widely explored. Most photonic crystal waveguide structures are designed and fabricated in triangular lattice with circular holes. We designed a single row W1 triangular lattice with a judicious choice of parameters guide. We evaluated the transmission in the guide and we got a maximum transmission about of 60% on the entire band related to the PBG. Another type of guide has been designed, it is the bend guide W1 triangular lattice, by optimizing the topology of the bend, we have shown that the transmission bend circuit is much improved over a wide range. PC waveguide is one class of PC devices that has been demonstrated for RI (refractive index) measurements. For the development of two dimensional reconfigurable photonic circuits, we propose an RI sensor based on single line PCW structure. When the PC’s air holes are full of homogenous de-ionized water, the wavelength position of band edges of this sensor will shift accordingly due to the variation of RI. The sensor is sensitive to the change of RI in the air hole and it can be optimized to realize high sensitivity,wide measurement range and improved transmission. It has been observed that a 306 nm wavelength position of the lower band edge shift was observed corresponding to a sensitivity of more than 927 nm/RIU (refractive index nit). Diplôme : Doctorat en sciences En ligne : ../theses/electronique/BOU6431.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9455

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Caractérisation d’une antenne microbande couplée par une ouverture de forme rectangulaire / Leila Chouti  

Public ISBD 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) Tags : 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  ??????? ????? ??????  ??????? ??????? ?????? ???????? ?????  ?????  FDTD ????  MIMO????? ????? ???????? Index. 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 : pdf Permalink : https://bu.umc.edu.dz/md/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 . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 112 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Tags : 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  ??????? ????? ??????  ??????? ??????? ?????? ???????? ?????  ?????  FDTD ????  MIMO????? ????? ???????? Index. 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 : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10909

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