Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Conception Dantennes Miniatures A Base De Materiaux Innovants Pour Systemes De Communications Mobiles
Download Conception Dantennes Miniatures A Base De Materiaux Innovants Pour Systemes De Communications Mobiles full books in PDF, epub, and Kindle. Read online Conception Dantennes Miniatures A Base De Materiaux Innovants Pour Systemes De Communications Mobiles ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Conception d’antennes miniatures à base de matériaux innovants pour systèmes de communications mobiles by : Laure Huitema
Download or read book Conception d’antennes miniatures à base de matériaux innovants pour systèmes de communications mobiles written by Laure Huitema and published by . This book was released on 2011 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Face à la volonté d’intégrer une quantité toujours plus importante de nouveaux services au sein des terminaux mobiles de nouvelle génération et afin de répondre à leurs contraintes d’encombrement, de nouveaux concepts d’antennes intelligentes font l’objet de nombreuses recherches. Le principal objectif est d’offrir de nouveaux services avec une qualité de réception optimale aux abonnés tout en s’inscrivant dans la tendance du marché. L’antenne devra donc être miniature et capable de s’adapter à son environnement, c'est-à-dire à des conditions changeantes en ajustant sa fréquence de travail, sa polarisation ou son diagramme de rayonnement. Deux axes sont explorés dans le cadre de cette thèse. Dans un premier temps, il est nécessaire de s’attaquer au verrou de l’encombrement des antennes et de la coexistence de divers services en explorant les potentialités offertes par le développement de matériaux originaux pour la miniaturisation des antennes. A partir des résultats obtenus, il devient alors possible d’envisager des concepts d’antennes miniatures dont l’objectif est d’introduire des fonctions d’agilité pour adapter les performances de l’antenne à son environnement et à son contexte d’utilisation. Ce mémoire propose de répondre à ces deux objectifs en présentant le développement, la conception et la réalisation de quatre architectures d’antennes miniatures et reconfigurables à base de matériaux innovants.
Book Synopsis The European Landscape Convention by : Michael Jones
Download or read book The European Landscape Convention written by Michael Jones and published by Springer Science & Business Media. This book was released on 2011-02-09 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important and insightful book provides, for the first time, a broad presentation of ongoing research into public participation in landscape conservation, management and planning, following the 2000 European Landscape Convention which came into force in 2004. The book examines both the theory of participation and what lessons can be learnt from specific European examples. It explores in what manner and to what extent the provisions for participation in the European Landscape Convention have been followed up and implemented. It also presents and compares different experiences of participation in selected countries from northern, southern, eastern and western Europe, and provides a critical examination of public participation in practice. However, while the book’s focus is necessarily on Europe, many of the conclusions drawn are of global relevance. The book provides a valuable reference for researchers and advanced students in landscape policies and management, as well as for professionals and others interested in land-use planning and environmental management.
Book Synopsis Building Wireless Community Networks by : Rob Flickenger
Download or read book Building Wireless Community Networks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.
Book Synopsis Ultra Wide Band Antennas by : Xavier Begaud
Download or read book Ultra Wide Band Antennas written by Xavier Begaud and published by John Wiley & Sons. This book was released on 2013-03-04 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Wireless Hacks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.
Download or read book MIMO written by Alain Sibille and published by Academic Press. This book was released on 2010-12-03 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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)
Book Synopsis Pervasive Mobile and Ambient Wireless Communications by : Roberto Verdone
Download or read book Pervasive Mobile and Ambient Wireless Communications written by Roberto Verdone and published by Springer Science & Business Media. This book was released on 2012-01-02 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reporting the findings of COST 2100, a major European intergovernmental project, this volume offers system designers a good source of guidelines based on channel characterization and measurement-based modeling, as well as worthwhile ideas for future research.
Book Synopsis Engineering Acoustics by : Michael Möser
Download or read book Engineering Acoustics written by Michael Möser and published by Springer Science & Business Media. This book was released on 2009-09-01 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Suitable for both individual and group learning, Engineering Acoustics focuses on basic concepts and methods to make our environments quieter, both in buildings and in the open air. The author’s tutorial style derives from the conviction that understanding is enhanced when the necessity behind the particular teaching approach is made clear. He also combines mathematical derivations and formulas with extensive explanations and examples to deepen comprehension. Fundamental chapters on the physics and perception of sound precede those on noise reduction (elastic isolation) methods. The last chapter deals with microphones and loudspeakers. Moeser includes major discoveries by Lothar Cremer, including the optimum impedance for mufflers and the coincidence effect behind structural acoustic transmission. The appendix gives a short introduction on the use of complex amplitudes in acoustics.
Book Synopsis Conception d'antennes miniatures, multi-bandes et à polarisation circulaire à base de matériaux ferrites polarisés by : Sarra Jemmeli
Download or read book Conception d'antennes miniatures, multi-bandes et à polarisation circulaire à base de matériaux ferrites polarisés written by Sarra Jemmeli and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'essor fulgurant que connaissent les systèmes de communication sans fil, depuis plusieurs décennies, a amplifié le besoin de dispositifs hyperfréquences de plus en plus performants. Les antennes jouent un rôle important dans la mise au point et l'amélioration du rendement de ces systèmes. La diversité des domaines d'application requiert de ces dispositifs qu'ils répondent à de nombreux standards de communication et donc le caractère multi-bandes est extrêmement demandé. De plus, afin d'assurer une bonne qualité de liaison entre l'émetteur et le récepteur, le rayonnement d'une onde à polarisation circulaire est souvent sollicité. Le caractère miniature de ces antennes est également essentiel afin de faciliter leur intégration et de réduire l'encombrement des systèmes. Développer des antennes combinant ces trois critères : miniaturisation, polarisation circulaire et fonctionnement multi-bandes, constitue un véritable défi. L'objectif principal de cette thèse est de tirer profit des caractéristiques d'anisotropie et de non-réciprocité des matériaux ferrites, lorsqu'ils sont soumis à un champ magnétique statique afin de concevoir des antennes répondant aux trois critères définis ci-dessus. La stratégie adoptée au cours de ces travaux consiste à établir une méthodologie complète permettant d'étudier la réponse électromagnétique d'une antenne à ferrite en fonction des caractéristiques de ces matériaux. Cette démarche repose sur une analyse modale suivie de modélisations numériques et de validations expérimentales. Les différentes contraintes rencontrées au cours de ces travaux sont discutées et des solutions appropriées sont proposées.
