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Conception Et Caracterisation Dantennes A Metamateraiux Sur Textiles
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Book Synopsis Conception et caractérisation d'antennes à métamatéraiux sur textiles by : Mohamad Mantash
Download or read book Conception et caractérisation d'antennes à métamatéraiux sur textiles written by Mohamad Mantash and published by . This book was released on 2012 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les vêtements communicants et intelligents sont destinés entre autre, aux usagers des métiers à risque (pompiers, policiers, militaires, ...), mais aussi aux applications sportives, médicales, spatiales, .... Ils intègrent de l'électronique embarquée et de multiples émetteurs-récepteur RF, afin de couvrir de nombreux standards de communication (In/On/Off Body communication). Réalisé dans le cadre du projet ANR Metavest, ce travail de thèse est consacré au développement et la caractérisation des antennes flexibles sur textiles pour les gammes de fréquences WiFi et 4G LTE (2.4-2.7, 5.1-5.875 GHz), ainsi qu'à la protection des usagers contre le rayonnement de ces antennes. Après une étude bibliographique sur la topologie et la technologie des antennes sur textile nous avons procédé à la caractérisation des textiles couramment utilisés dans la fabrication des vêtements, pour lesquels les paramètres radioélectriques sont généralement inconnus. Plusieurs types d'antennes sur textile sont ensuite conçus et réalisés pour couvrir les bandes de fréquence demandées. L'un d'entre eux consiste à utiliser une fermeture éclair pour réaliser une antenne originale, reconfigurable en fréquence. Afin de réduire le rayonnement arrière des antennes sur vêtement et protéger l'utilisateur des méfaits des ondes électromagnétiques, plusieurs réflecteurs de type CMA (conducteur magnétique artificiel) sont modélisés (analytiquement) et testés. Une topologie originale (cellule hexagonale) est proposée pour améliorer les performances du réflecteur. L'ensemble Antenne-CMA a répondu aux exigences du cahier des charges, même sous condition de courbure.
Book Synopsis Développement Et Caractérisation de Métamatériaux Pour Application en Cavité by : Mario Martinis
Download or read book Développement Et Caractérisation de Métamatériaux Pour Application en Cavité written by Mario Martinis and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents new developments in cavity type antennas. The main objective of the thesis is bandwidth performance analysis of antennas in cavities with aperture sizes which are small compared to the free space wavelength. Cavities of rectangular and circular shapes in an infinite and finite ground plane are investigated in detail. So far in the literature, microstrip patch antennas were the antenna of choice for cavity type antennas. The intention of the thesis is to determine if cavity type antennas can be improved and how. To this end, the bound on bandwidth for cavity antennas is investigated theoretically. It is concluded that patch antennas, in fact, do not reach the bound for cavity antennas, which is one of the key results of the thesis. Infinite and finite sized ground plane cavity antennas are further analyzed using several simple transmission line models. The second key result of the thesis is a demonstration that a special transmission line model corresponds to antennas that reach the bound on bandwidth. This transmission line model is the basis to a new cavity antenna design. Finally, the most important result is a practical, physical, design of novel cavity antennas capable of reaching the bandwidth bound. Furthermore, several additional topics are explored; i) A comparison with stacked patches design in terms of bandwidth, ease of fabrication, and cost; ii) The extension of the bound with the inclusion of ideal magnetic materials and magnetic conductors; iii) The new antenna design use in constructing a compact antenna array; iv) The benefits of the new design for constructing small cavity antennas previously not feasible with the classical design.
Book Synopsis Conception d'un réseau d'antennes adaptatif en utilisant les métamatériaux by : Betty Savitri
Download or read book Conception d'un réseau d'antennes adaptatif en utilisant les métamatériaux written by Betty Savitri and published by . This book was released on 2017 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Disappearing Computer by : Norbert Streitz
Download or read book The Disappearing Computer written by Norbert Streitz and published by Springer. This book was released on 2007-07-20 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines how the computer, as we currently know it, will be replaced by a new generation of technologies, moving computing off the desktop and ultimately integrating it with real world objects and everyday environments. It provides a unique combination of concepts, methods and prototypes of ubiquitous and pervasive computing reflecting the current interest in smart environments and ambient intelligence.
Book Synopsis Space-Time Coding for Broadband Wireless Communications by : Georgios B. Giannakis
Download or read book Space-Time Coding for Broadband Wireless Communications written by Georgios B. Giannakis and published by John Wiley & Sons. This book was released on 2007-02-26 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Eine vielversprechende Technologie zur Maximierung der Bandbreiteneffizienz in der breitbandigen drahtlosen Kommunikation ist die Raum-Zeit-Kodierung. Theorie und Praxis verbindend, ist dieses Buch die erste umfassende Diskussion von Grundlagen und designorientierten Aspekten von Raum-Zeit-Codes. Single-Carrier und Multi-Carrier-Übertragungen für Einzel- und Mehrnutzerkommunikation werden behandelt.
Book Synopsis Electric Machines and Drives by : Miroslav Chomat
Download or read book Electric Machines and Drives written by Miroslav Chomat and published by BoD – Books on Demand. This book was released on 2011-02-28 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of this book is an important and diverse field of electric machines and drives. The twelve chapters of the book written by renowned authors, both academics and practitioners, cover a large part of the field of electric machines and drives. Various types of electric machines, including three-phase and single-phase induction machines or doubly fed machines, are addressed. Most of the chapters focus on modern control methods of induction-machine drives, such as vector and direct torque control. Among others, the book addresses sensorless control techniques, modulation strategies, parameter identification, artificial intelligence, operation under harsh or failure conditions, and modelling of electric or magnetic quantities in electric machines. Several chapters give an insight into the problem of minimizing losses in electric machines and increasing the overall energy efficiency of electric drives.
Book Synopsis Photovoltaic Engineering Handbook by : F Lasnier
Download or read book Photovoltaic Engineering Handbook written by F Lasnier and published by CRC Press. This book was released on 1990-01-01 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Photovoltaic Engineering Handbook is the first book to look closely at the practical problems involved in evaluating and setting up a photovoltaic (PV) power system. The author's comprehensive knowledge of the subject provides a wealth of theoretical and practical insight into the different procedures and decisions that designers need to make. Unique in its coverage, the book presents technical information in a concise and simple way to enable engineers from a wide range of backgrounds to initiate, assess, analyze, and design a PV system. It is beneficial for energy planners making decisions on the most appropriate system for specific needs, PV applications engineers, and anyone confronting the practical difficulties of setting up a PV power system.
Book Synopsis Optimization, Simulation and Control by : Rentsen Enkhbat
Download or read book Optimization, Simulation and Control written by Rentsen Enkhbat and published by Springer Nature. This book was released on 2023-12-01 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers selected, peer-reviewed works presented at the 7th International Conference on Optimization, Simulation and Control, ICOSC 2022, held at the National University of Mongolia, Ulaanbaatar, June 20–22, 2022. Topics covered include (but are not limited to) mathematical programming; network, global, linear, nonlinear, parametric, stochastic, and multi-objective optimization; control theory; biomathematics; and deep and machine learning, to name a few. Held every three years since 2002, the ICOSC conference has become a traditional gathering for experienced and young researchers in optimization and control to share recent findings in these fields and discuss novel applications in myriad sectors. Researchers and graduate students in the fields of mathematics, engineering, and computer science can greatly benefit from this book, which can also be enjoyed by advanced practitioners in research laboratories and the industry. The 2022 edition of the ICOSC conference was sponsored by the Mongolian Academy of Sciences, the National University of Mongolia and the German-Mongolian Institute for Resources and Technology.
