Étude Et Conception D'antennes À Résonateur de Pérot-Fabry Compacts Pour Les Applications Spatiales PDF Download
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Author: Shoaib Anwar Muhammad
Publisher:
ISBN:
Category :
Languages : en
Pages : 258
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Book Description
The study and design of purely metallic, compact, completely shielded Fabry- Perot antennas for focal array applications is addressed in this thesis. The first part is dedicated to the state of the art for evaluating the existing solutions. Next, the classical Fabry-Perot antennas with small lateral size are studied in order to evaluate their performance. The third part presents a new stacked Fabry-Perot cavity antenna configuration. The improvement using the stacked configuration, in terms of control of parasitic modes, radiation and impedance frequency bandwidths and quality of radiation patterns is shown with the help of numerical and experimental results. The fourth part of this thesis presents three different methods to obtain circular polarization for compact, purely metallic Fabry-Perot antennas. Each method is validated using numerical simulations and experimental results. A detailed comparison is presented at the end with an existing solution using horn antennas.
Author: Shoaib Anwar Muhammad
Publisher:
ISBN:
Category :
Languages : en
Pages : 258
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Book Description
The study and design of purely metallic, compact, completely shielded Fabry- Perot antennas for focal array applications is addressed in this thesis. The first part is dedicated to the state of the art for evaluating the existing solutions. Next, the classical Fabry-Perot antennas with small lateral size are studied in order to evaluate their performance. The third part presents a new stacked Fabry-Perot cavity antenna configuration. The improvement using the stacked configuration, in terms of control of parasitic modes, radiation and impedance frequency bandwidths and quality of radiation patterns is shown with the help of numerical and experimental results. The fourth part of this thesis presents three different methods to obtain circular polarization for compact, purely metallic Fabry-Perot antennas. Each method is validated using numerical simulations and experimental results. A detailed comparison is presented at the end with an existing solution using horn antennas.
Author: Badr Eddine Ratni
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Cette thèse a pour but de mettre en avant les récentes avancées dans le domaine des métasurfaces. Ces structures ont été utilisées dans le but d'améliorer les performances des antennes classiques ou de concevoir de nouveaux concepts d'antenne. Les travaux menés s'inscrivent dans le cadre d'une collaboration avec des partenaires industriels qui sont Airbus Safran Lunchers, Airbus Group Innovations et le CNES. La thèse est organisée en deux parties. La première partie est consacrée aux métasurfaces utilisées comme des surfaces partiellement réfléchissantes (SPR) pour concevoir des antennes à cavité Fabry-Perot. Un modèle analytique permettant de prédire le dépointage du faisceau d'antenne par une modulation de la phase sur la SPR a été développé. Ensuite, un nouveau concept de métasurface permettant de réaliser du dépointage de faisceau est proposé. Il consiste à appliquer un gradient de phase en faisant varier l'indice effectif le long du substrat diélectrique de la SPR. La deuxième partie de cette thèse est quant à elle consacrée à la conception d'une métasurface active permettant d'émuler plusieurs fonctions. Dans un premier temps, la métasurface est utilisée comme un réflecteur présentant une reconfigurabilité fréquentielle et angulaire. Ensuite cette métasurface est utilisée comme polariseur reconfigurable où une polarisation linéaire de l'onde incidente est convertie en polarisation circulaire. Enfin, la dernière étude concerne l'utilisation de la métasurface active pour la réalisation d'une antenne à réflecteur cylindro-parabolique et à réflecteur dièdre reconfigurables.
Author: RONAN.. SAULEAU
Publisher:
ISBN:
Category :
Languages : fr
Pages : 272
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Book Description
IL S'AGIT D'ETUDIER ET DE CONCEVOIR DES ANTENNES A FAISCEAU GAUSSIEN (GBA : GAUSSIAN BEAM ANTENNA) A 60 GHZ. ELLES SONT CONSTITUEES D'UN RESONATEUR DE PEROT-FABRY EXCITE PAR UNE ANTENNE IMPRIMEE OU UNE ANTENNE CORNET. LE TRAVAIL S'ARTICULE AUTOUR DE TROIS POINTS PRINCIPAUX : _ L'ETUDE D'ANTENNES IMPRIMEES EN ONDES MILLIMETRIQUES REPOSE SUR LA METHODE FDTD (FINITE DIFFERENCE TIME DOMAIN) INCLUANT LES PERTES METALLIQUES ET LES TECHNIQUES DE PROGRAMMATION VECTORIELLE ET PARALLELE. LES RESULTATS EXPERIMENTAUX MONTRENT LES BONNES PERFORMANCES DES ANTENNES SUR QUARTZ AMORPHE, COMPARE L'ALUMINE. LES TECHNIQUES DE MESURES A 60 GHZ ET LES DIFFICULTES ASSOCIEES SONT DECRITES ET ANALYSEES. _ DEUX APPROCHES SONT UTILISEES POUR MODELISER DES CAVITES DE PEROT-FABRY DONT LES MIROIRS SEMI-TRANSPARENTS SONT DES GRILLES 2D. LA PREMIERE EST BASEE SUR DES CIRCUITS ELECTRIQUES EQUIVALENTS, SIMPLES A METTRE EN UVRE, MAIS LIMITES EN TERME DE PRECISION. LA SECONDE MODELISE GLOBALEMENT LA CAVITE AVEC LA FDTD. L'ETUDE THEORIQUE ET EXPERIMENTALE DES REPONSES FREQUENTIELLES EN QUASI-OPTIQUE MONTRENT LES PERFORMANCES ET LES PRINCIPAUX DEFAUTS DE CES RESONATEURS. NOUS PRECISONS EGALEMENT LES DOMAINES DE VALIDITE DES MODELES CIRCUIT ET ETABLISSONS DES REGLES DE CONCEPTION DE GBA. _ L'ANALYSE THEORIQUE DES GBA EST MENEE AVEC LA FDTD ET AVEC LA THEORIE DU POINT SOURCE COMPLEXE. LES RESULTATS OBTENUS AVEC DES SOURCES A POLARISATION LINEAIRE OU CIRCULAIRE (GUIDES D'ONDE, CORNETS, ANTENNES IMPRIMEES) ET AVEC DES CAVITES DE GEOMETRIES TRES VARIEES CONFIRMENT LA QUALITE DE LEURS DIAGRAMMES DE RAYONNEMENT (FAIBLES LOBES SECONDAIRES, FAIBLES COMPOSANTES CROISEES), AINSI QUE LEUR RENDEMENT MOYEN. TOUTES LES ETAPES DU TRAVAIL SONT VALIDEES EXPERIMENTALEMENT. CELA IMPLIQUE NON SEULEMENT LA MAITRISE DES TECHNIQUES DE MESURE A 60 GHZ EN IMPEDANCE, EN RAYONNEMENT ET EN QUASI-OPTIQUE, MAIS AUSSI LE DEVELOPPEMENT DE PROCEDES TECHNOLOGIQUES POUR LA FABRICATION DE DISPOSITIFS RAYONNANTS EN ONDES MILLIMETRIQUES.
Author: Mohammad Abdul Matin
Publisher: Springer Nature
ISBN: 303074311X
Category : Technology & Engineering
Languages : en
Pages : 448
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Book Description
This book provides current R&D trends and novel approaches in design and analysis of broadband, multiband, and smart antennas for 5G and B5G mobile and wireless applications, as well as the identification of integration techniques of these antennas in a diverse range of devices. The book presents theoretical and experimental approaches to help the reader in understanding the unique design issues and more advanced research. Moreover, the book includes chapters on the fundamentals of antenna theory. The book is pertinent to professionals and researchers working in the field of antenna engineering; it is written for graduate students, researchers, academics, and industry practitioners who want to improve their understanding in the current research trends in design analysis of broadband, multiband, and smart antennas for wireless applications.
Author: Claude Cohen-Tannoudji
Publisher: John Wiley & Sons
ISBN: 3527345558
Category : Science
Languages : en
Pages : 790
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Book Description
This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Author: Joseph Weber
Publisher: Courier Corporation
ISBN: 0486438872
Category : Science
Languages : en
Pages : 210
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Book Description
An internationally famous physicist and electrical engineer, the author of this text was a pioneer in the investigation of gravitational waves. Joseph Weber's General Relativity and Gravitational Waves offers a classic treatment of the subject. Appropriate for upper-level undergraduates and graduate students, this text remains ever relevant. Brief but thorough in its introduction to the foundations of general relativity, it also examines the elements of Riemannian geometry and tensor calculus applicable to this field. Approximately a quarter of the contents explores theoretical and experimental aspects of gravitational radiation. The final chapter focuses on selected topics related to general relativity, including the equations of motion, unified field theories, Friedman's solution of the cosmological problem, and the Hamiltonian formulation of general relativity. Exercises. Index.
Author: Robert C. Hansen
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 472
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Book Description
Author: Alexander V. Sergienko
Publisher: CRC Press
ISBN: 1420026607
Category : Science
Languages : en
Pages : 248
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Book Description
All current methods of secure communication such as public-key cryptography can eventually be broken by faster computing. At the interface of physics and computer science lies a powerful solution for secure communications: quantum cryptography. Because eavesdropping changes the physical nature of the information, users in a quantum exchange can easily detect eavesdroppers. This allows for totally secure random key distribution, a central requirement for use of the one-time pad. Since the one-time pad is theoretically proven to be undecipherable, quantum cryptography is the key to perfect secrecy. Quantum Communications and Cryptography is the first comprehensive review of the past, present, and potential developments in this dynamic field. Leading expert contributors from around the world discuss the scientific foundations, experimental and theoretical developments, and cutting-edge technical and engineering advances in quantum communications and cryptography. The book describes the engineering principles and practical implementations in a real-world metropolitan network as well as physical principles and experimental results of such technologies as entanglement swapping and quantum teleportation. It also offers the first detailed treatment of quantum information processing with continuous variables. Technologies include both free-space and fiber-based communications systems along with the necessary protocols and information processing approaches. Bridging the gap between physics and engineering, Quantum Communications and Cryptography supplies a springboard for further developments and breakthroughs in this rapidly growing area.
Author: Xavier Begaud
Publisher: John Wiley & Sons
ISBN: 1118586573
Category : Technology & Engineering
Languages : en
Pages : 217
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Book Description
Ultra Wide Band Technology (UWB) has reached a level of maturity that allows us to offer wireless links with either high or low data rates. These wireless links are frequently associated with a location capability for which ultimate accuracy varies with the inverse of the frequency bandwidth. Using time or frequency domain waveforms, they are currently the subject of international standards facilitating their commercial implementation. Drawing up a complete state of the art, Ultra Wide Band Antennas is aimed at students, engineers and researchers and presents a summary of internationally recognized studies.
Author: Alain Sibille
Publisher: Academic Press
ISBN: 0123821959
Category : Technology & Engineering
Languages : es
Pages : 385
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Book Description
Foreword from Arogyaswami Paulraj, Professor (Emeritus), Stanford University (USA) - The first book to show how MIMO principles can be implemented in today's mobile broadband networks and components - Explains and solves some of the practical difficulties that arise in designing and implementing MIMO systems - Both theory and implementation sections are written in the context of the most recent standards: IEEE 802.11n (WiFi); IEEE 802.16 (WIMAX); 4G networks (3GPP/3GPP2, LTE)
