Antenne à bande interdite électromagnetique (B.I.E.) directive

Download Antenne à bande interdite électromagnetique (B.I.E.) directive PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.:/5 (495 download)

DOWNLOAD NOW!


Book Synopsis Antenne à bande interdite électromagnetique (B.I.E.) directive by : Thai-Hung Vu

Download or read book Antenne à bande interdite électromagnetique (B.I.E.) directive written by Thai-Hung Vu and published by . This book was released on 2009 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail de thèse porte sur les antennes directives à Bande Interdite Electromagnétique (BIE) ou à cavité Fabry Pérot (FP) et tente de résoudre leur deux problématiques majeures : i) difficulté d’évaluation et donc d’adaptation d’impédance et ii) faible bande passante en diagramme (de rayonnement) et en directivité. Après un bref état de l’art, dans le chapitre I, sur les matériaux à BIE ainsi que sur leurs applications en micro-ondes et aux antennes, le chapitre II traite en détail des règles de conception des antennes BIE. Le chapitre III montre une étude théorique originale sur l’évaluation de leur impédance d’entrée. Pour ce faire, une méthode d’images dite « modifiée » est proposée. L’application de cette méthode nous a permis de réduire le problème de l’évaluation de l’impédance d’entrée d’une antenne à cavité, à un problème de réseau d’antennes ou plutôt de réseau de sources primaires judicieusement pondérées. La matrice de couplage mutuelle permet alors d’obtenir l’impédance d’entrée de l’antenne d’origine. Un processus d’adaptation de l’antenne à cavité excitée par une source simple, telle qu’un dipôle, est ensuite proposé. Le chapitre IV est consacré à l’étude des SSRs (Surface Semi Réfléchissante) combinées, composées de deux ou plusieurs SSRs simples. Leur propriété est de présenter une allure de phase non conventionnelle, dite inversée, qui permet d’élargir la bande passante des antennes à cavité. Le chapitre V détaille l’optimisation de la SSR combinée pour obtenir un maximum d’élargissement de la bande de fonctionnement de l’antenne BIE. Enfin, un exemple de réalisation est présenté pour confirmer les différents résultats théoriques obtenus, ainsi que les différentes étapes de la méthodologie de conception d’antenne que nous avons élaborée. Mots clés : Antenne BIE, antennes directives, cavité Fabry Pérot (FP), SSR combinée, élargissement de la bande passante, impédance d’entrée, méthode d’images, analyse du couplage.

Annales des télécommunications

Download Annales des télécommunications PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 1526 pages
Book Rating : 4.:/5 (53 download)

DOWNLOAD NOW!


Book Synopsis Annales des télécommunications by :

Download or read book Annales des télécommunications written by and published by . This book was released on 2004 with total page 1526 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Structures à bande interdite électromagnétique

Download Structures à bande interdite électromagnétique PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 145 pages
Book Rating : 4.:/5 (495 download)

DOWNLOAD NOW!


Book Synopsis Structures à bande interdite électromagnétique by : Moussa Elayachi

Download or read book Structures à bande interdite électromagnétique written by Moussa Elayachi and published by . This book was released on 2008 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les travaux présentés dans ce mémoire portent sur l'étude d'antennes planaires à base de matériaux BIE. Dans une première partie, nous avons fait une présentation des méthodes d'identification de la bande interdite des matériaux BIE. Nous avons détaillé la Méthode de Phase Réfléchie utilisée dans ce travail. Ensuite, nous avons présenté les maquettes BIE de type Mushroom qui ont été réalisées. Dans la seconde partie, nous avons étudié le comportement électromagnétique d'une antenne imprimée qui présente d'excellentes caractéristiques de rayonnement. L'utilisation des surfaces BIE réalisées, comme plans réflecteurs, nous a permis de miniaturiser considérablement l'épaisseur globale de l'antenne. Cette étude, nous a permis aussi de mettre en évidence que les structures BIE peuvent constituer une voie vers la conception d'antennes multi bandes et/ou ultra large bande. Dans la dernière partie, nous avons présenté une structure BIE originale qui a été optimisée de manière à être plus compétitive en termes de coûts et de performances vis à vis de la structure Mushroom. La structure BIE proposée a permis d'obtenir une structure totale d'antenne planaire d'épaisseur réduite dont les performances mesurées sont quasiment aussi bonnes que celle de l'antenne référence sur plan conducteur électrique. L'antenne planaire développée offre des perspectives intéressantes pour les applications Wireless (WIFI, WIMAX, ...).

Broadband Planar Antennas

Download Broadband Planar Antennas PDF Online Free

Author :
Publisher : John Wiley & Sons
ISBN 13 : 047087175X
Total Pages : 258 pages
Book Rating : 4.4/5 (78 download)

DOWNLOAD NOW!


Book Synopsis Broadband Planar Antennas by : Zhi Ning Chen

Download or read book Broadband Planar Antennas written by Zhi Ning Chen and published by John Wiley & Sons. This book was released on 2006-05-01 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increasing demand for wireless communications has revolutionised the lifestyle of today’s society and one of the key components of wireless technology is antenna design. Broadband planar antennas are the newest generation of antennas boasting the attractive features required, such as broad operating bandwidth, low profile, light weight, low cost and ease of integration into arrays or Radio Frequency (RF) circuits, to make them ideal components of modern communications systems. Research into small and broadband antennas has been spurred by the rapid development of portable wireless communication devices such as cell phones, laptops and personal digital assistants. This all-encompassing volume, Broadband Planar Antennas: Design and Applications, systematically describes the techniques for all planar antennas from microstrip patch antennas, suspended plate antennas and planar inverted-L/F antennas to planar dipole antennas. Also discussed are some of the most recent outcomes such as broadband antenna issues in promising ultra-wideband applications. Clearly describes the fundamentals of planar antennas and categorises them according to their radiation characteristics Introduces the advanced progress in broadband planar antennas for modern wireless communications Includes a wealth of case studies, design guidelines, figures and tables This text is essential reading for antenna, RF and microwave engineers and manufacturers within the telecommunications industry. Its highly accessible approach will also appeal to researchers, postgraduate students and academic lecturers.

Caractérisation des matériaux à bande interdite électromagnétique multiperiodiques et leurs applications aux antennes

Download Caractérisation des matériaux à bande interdite électromagnétique multiperiodiques et leurs applications aux antennes PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 275 pages
Book Rating : 4.:/5 (799 download)

DOWNLOAD NOW!


Book Synopsis Caractérisation des matériaux à bande interdite électromagnétique multiperiodiques et leurs applications aux antennes by : Tanguy Jaffré

Download or read book Caractérisation des matériaux à bande interdite électromagnétique multiperiodiques et leurs applications aux antennes written by Tanguy Jaffré and published by . This book was released on 2005 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les matériaux à Bande Interdite Electromagnétique (BIE) 3D diélectriques ou métalliques présentent des propriétés de filtrages fréquentiels et spatiaux très intéressantes. La principale difficulté dans ce domaine reste leur conception. La techniq ue du prototypage rapide offre une solution en réalisant des structures céramiques couche par couche à partir d'une pâte photo polymérisable par radiation UV. Une fois frittée, la céramique possède les mêmes propriétés que celles obtenues par des techniques de réalisation plus traditionnelles. Ce mémoire est consacré à la caractérisation de ces structures à partir de leurs propriétés électromagnétiques. Un banc de mesure en espace libre permet d'identifier la bande interdite des structures réalisées. L'objectif de ce travail est d'utiliser les structures ainsi caractérisées pour réaliser des antennes BIE. Le filtrage spatial et fréquentiel permet le contrôle des directions privilégiées du rayonnement et de la directivité de l'antenne

Planar Antennas

Download Planar Antennas PDF Online Free

Author :
Publisher : CRC Press
ISBN 13 : 1000436101
Total Pages : 365 pages
Book Rating : 4.0/5 (4 download)

DOWNLOAD NOW!


Book Synopsis Planar Antennas by : Praveen Kumar Malik

Download or read book Planar Antennas written by Praveen Kumar Malik and published by CRC Press. This book was released on 2021-10-21 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive reference text discusses fundamental concepts, applications, design techniques, and challenges in the field of planar antennas. The text focuses on recent advances in the field of planar antenna design and their applications in various fields of research, including space communication, mobile communication, wireless communication, and wearable applications. This resource presents planar antenna design concepts, methods, and techniques to enhance the performance parameters and applications for IoTs and device-to-device communication. The latest techniques used in antenna design, including their structures defected ground, MIMO, and fractal design, are discussed comprehensively. The text will be useful for senior undergraduate students, graduate students, and academic researchers in fields including electrical engineering, electronics, and communication engineering.

Obiter Dicta

Download Obiter Dicta PDF Online Free

Author :
Publisher : punctum books
ISBN 13 : 1685710026
Total Pages : 391 pages
Book Rating : 4.6/5 (857 download)

DOWNLOAD NOW!


Book Synopsis Obiter Dicta by : Erick Verran

Download or read book Obiter Dicta written by Erick Verran and published by punctum books. This book was released on 2021-10-14 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stitched together over five years of journaling, Obiter Dicta is a commonplace book of freewheeling explorations representing the transcription of a dozen notebooks, since painstakingly reimagined for publication. Organized after Theodor Adorno's Minima Moralia, this unschooled exercise in aesthetic thought--gleefully dilettantish, oftentimes dangerously close to the epigrammatic--interrogates an array of subject matter (although inescapably circling back to the curiously resemblant histories of Western visual art and instrumental music) through the lens of drive-by speculation. Erick Verran's approach to philosophical inquiry follows the brute-force literary technique of Jacques Derrida to exhaustively favor the material grammar of a signifier over hand-me-down meaning, juxtaposing outer semblances with their buried systems and our etched-in-stone intuitions about color and illusion, shape and value, with lessons stolen from seemingly unrelatable disciplines. Interlarded with extracts of Ludwig Wittgenstein but also Wallace Stevens, Cormac McCarthy as well as Roland Barthes, this cache of incidental remarks eschews what's granular for the biggest picture available, leaving below the hyper-specialized fields of academia for a bird's-eye view of their crop circles. Obiter Dicta is an unapologetic experiment in intellectual dot-connecting that challenges much long-standing wisdom about everything from illuminated manuscripts to Minecraft and the evolution of European music with lyrical brevity; that is, before jumping to the next topic.

Philostratus

Download Philostratus PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 280 pages
Book Rating : 4.:/5 (31 download)

DOWNLOAD NOW!


Book Synopsis Philostratus by : Philostratus (the Athenian)

Download or read book Philostratus written by Philostratus (the Athenian) and published by . This book was released on 1912 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Analecta: Or, Materials For a History of Remarkable Providences; Mostly Relating to Scotch Ministers and Christians

Download Analecta: Or, Materials For a History of Remarkable Providences; Mostly Relating to Scotch Ministers and Christians PDF Online Free

Author :
Publisher : BoD – Books on Demand
ISBN 13 : 3385129664
Total Pages : 410 pages
Book Rating : 4.3/5 (851 download)

DOWNLOAD NOW!


Book Synopsis Analecta: Or, Materials For a History of Remarkable Providences; Mostly Relating to Scotch Ministers and Christians by : Robert Wodrow

Download or read book Analecta: Or, Materials For a History of Remarkable Providences; Mostly Relating to Scotch Ministers and Christians written by Robert Wodrow and published by BoD – Books on Demand. This book was released on 2024-05-25 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reprint of the original, first published in 1842.

Broadband Patch Antennas

Download Broadband Patch Antennas PDF Online Free

Author :
Publisher : Artech House Antenna Library
ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.3/5 (91 download)

DOWNLOAD NOW!


Book Synopsis Broadband Patch Antennas by : Jean-François Zürcher

Download or read book Broadband Patch Antennas written by Jean-François Zürcher and published by Artech House Antenna Library. This book was released on 1995 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes both theoretical and practical aspects of advanced broadband patch antennas, providing a comprehensive review of the state of the art in the field. Modern antenna techniques are discussed for single patches, dual linear and circular polarizations designs, and arrays used in mobile communications. Includes 88 equations, 115 figures, and 200 references.

Confronting Poverty in Iraq

Download Confronting Poverty in Iraq PDF Online Free

Author :
Publisher : World Bank Publications
ISBN 13 : 0821385631
Total Pages : 114 pages
Book Rating : 4.8/5 (213 download)

DOWNLOAD NOW!


Book Synopsis Confronting Poverty in Iraq by : World Bank

Download or read book Confronting Poverty in Iraq written by World Bank and published by World Bank Publications. This book was released on 2011-01-10 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides the most comprehensive and rigorous analysis of Iraqi income and expenditure in several decades. The report makes extensive use of the Iraq Household Socio-Economic Survey, the first nationwide income and expenditure survey since 1988. IHSES data is complemented income and expenditure data from a wide range of other measures of living standards, allowing us to analyze living standards in a holistic way. The analysis presented here was performed with two main goals first, to inform the Government s Poverty Reduction Strategy; and second, to serve as a baseline for future assessments of changes in living standards and the identification of critical issues for deeper examination. Iraqi living standards have two unusual characteristics. First, they have fallen over the past generation. Second, they feature surprisingly little inequality. These characteristics are both rooted in Iraq s recent history of authoritarian government, war, military occupation, insurgency, and civil strife leading to infrastructure destruction and population displacement. There have been few opportunities for individuals to prosper from professional or entrepreneurial activities. Decades of neglected investment have resulted in deterioration of social services and economic infrastructure. Consequently, individuals have lacked capabilities to prosper and an investment climate conducive to prosperity. School enrollment and life expectancy have declined. Extremely low returns to education reflect the combination of poor educational quality and lack of employment opportunities. In terms of economic infrastructure, access to reliable electricity and water, and even access to paved roads are low, are further reflections of decades of neglect. While the upper end of the distribution has been pulled down by a lack of opportunities, the lower end has been supported by direct government provision of food. The Public Distribution System (PDS) provides 85 percent of food needs. While PDS has been useful as a safety net for the poor and the vulnerable, the system is expensive, inefficient, and fiscally risky. Indeed, PDS food rations account for a far greater share of public spending than does education or health. Going forward, Iraq faces two main challenges. First, although Iraq does not have to develop from scratch, it faces a formidable challenge in re-development. Second, a shift by the Government is required from direct provision of basic subsistence toward investment in human capacities. The Government can provide an enabling environment through investments in economic infrastructure and services to business and citizens, thus allowing the population to make productive use of education and their own labor. Both challenges are now being taken up by the Poverty Reduction Strategy, which articulates a detailed set of required actions and outlines priorities for government spending.

Serving in Silence

Download Serving in Silence PDF Online Free

Author :
Publisher :
ISBN 13 : 9781420844009
Total Pages : 384 pages
Book Rating : 4.8/5 (44 download)

DOWNLOAD NOW!


Book Synopsis Serving in Silence by : Margarethe Cammermeyer

Download or read book Serving in Silence written by Margarethe Cammermeyer and published by . This book was released on 2005-07 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most business owners go into business for themselves to increase their personal wealth, build an asset that they can either pass on to heirs or sell, and for greater flexibility or an enhanced quality of life. To do this, every business will eventually need employees. And this is the biggest hurdle a small business owner will face in growing the business. Common difficulties include finding a good fit for the growing enterprise; matching skill level with affordability; employee "management by abdication" issues; and the nightmare of compliance with regard to tax payment and reporting requirements. This book will provide a step-by-step guide to finding and keeping the right people. It provides suggestions on structuring the job, advertising and interviewing, creating job descriptions, and reviewing and rewarding team members. This book can help transition a one-man shop into a professional organization that will eventually be able to survive without the owner working at every task, thus building true business value.

Conceptual Modeling for Traditional and Spatio-Temporal Applications

Download Conceptual Modeling for Traditional and Spatio-Temporal Applications PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 354030326X
Total Pages : 475 pages
Book Rating : 4.5/5 (43 download)

DOWNLOAD NOW!


Book Synopsis Conceptual Modeling for Traditional and Spatio-Temporal Applications by : Christine Parent

Download or read book Conceptual Modeling for Traditional and Spatio-Temporal Applications written by Christine Parent and published by Springer Science & Business Media. This book was released on 2006-09-02 with total page 475 pages. Available in PDF, EPUB and Kindle. Book excerpt: From environmental management to land planning and geo-marketing, the number of application domains that may greatly benefit from using data enriched with spatio-temporal features is expanding very rapidly. This book shows that a conceptual design approach for spatio-temporal databases is both feasible and easy to apprehend. While providing a firm basis through extensive discussion of traditional data modeling concepts, the major focus of the book is on modeling spatial and temporal information.

The Mind of Dante

Download The Mind of Dante PDF Online Free

Author :
Publisher : Cambridge University Press
ISBN 13 : 0521055601
Total Pages : 212 pages
Book Rating : 4.5/5 (21 download)

DOWNLOAD NOW!


Book Synopsis The Mind of Dante by : U. Limentani

Download or read book The Mind of Dante written by U. Limentani and published by Cambridge University Press. This book was released on 1965-01-02 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originally published in 1965, these seven essays reproduce the lectures that were delivered in Cambridge to mark the seventh centenary of the birth of Dante.

The Walking Dead #92

Download The Walking Dead #92 PDF Online Free

Author :
Publisher : Image Comics
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 ( download)

DOWNLOAD NOW!


Book Synopsis The Walking Dead #92 by : Robert Kirkman

Download or read book The Walking Dead #92 written by Robert Kirkman and published by Image Comics. This book was released on 2011-12-14 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Get ready for some action.

Zoo Station

Download Zoo Station PDF Online Free

Author :
Publisher : Zest Books ™
ISBN 13 : 1541582187
Total Pages : 408 pages
Book Rating : 4.5/5 (415 download)

DOWNLOAD NOW!


Book Synopsis Zoo Station by : Christiane F.

Download or read book Zoo Station written by Christiane F. and published by Zest Books ™. This book was released on 2019-08-01 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This incredible autobiography of Christiane F. provides a vivid portrait of teen friendship, drug abuse, and alienation in and around Berlin's notorious Zoo Station. Christiane's rapid descent into heroin abuse and prostitution is shocking, but the boredom, longing for acceptance, thrilling risks, and even her musical obsessions are familiar to everyone. Previously published in Germany and the US to critical acclaim, Zest's new translation includes original photographs of Christiane and her friends.

Paintwork

Download Paintwork PDF Online Free

Author :
Publisher : Tim Maughan
ISBN 13 : 1463570465
Total Pages : 55 pages
Book Rating : 4.4/5 (635 download)

DOWNLOAD NOW!


Book Synopsis Paintwork by : Tim Maughan

Download or read book Paintwork written by Tim Maughan and published by Tim Maughan. This book was released on 2011 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In an era of "post-cyberpunk" science fiction, Maughan is firmly cyberpunk - or maybe "cyberpunk++," a genre that captures all the grit and glory of technology with a higher degree of plausibility and respect for real computers and networks than the genre had in its glory days...Maughan has a keen eye for the fictional possibilities of technology, a good hand with the what if/ten seconds in the future mode of storytelling, and he's quite adept at filling his work with hyper-cool eyeball kicks. These stories are fun and thought-provoking, a great combination." - Cory Doctorow, author of Down and Out in the Magic Kingdom and Little Brother "In our hothouse present, where technology is little more than vapour, Tim Maughan catches those fleeting moments of possibility in stories that ought to have no shelf-life whatsoever - and which, regardless, linger in the mind. I don't know how he does this. I don't know whether he is very naive, or very clever. One thing I do know: these stories are very, very good." - Simon Ings, author of Hot Head, The Weight of Numbers and Dead Water "They used to say that Science Fiction was hard to define, but that you'd know it when you saw it. How then to best recommend a collection like Paintwork? A book of augmented realties, icy conceptual surfaces and a healthy dose of contemporary corporate paranoia. Is even a simple book blurb as innocent as it first appears? The best Science Fiction isn't a road map, it's a toolkit, and Paintwork is a virtual users guide to a new kind of fictional future. A place where it's fine to pretend life's all a game, just so long as you stay on the winning team. If Science Fiction is a toolkit, Paintwork is the missing users manual." - Tom Hunter, Director, the Arthur C. Clarke Award "Havana Augmented is the third short story in Tim Maughan's excellent Paintwork (2011), a collection that focuses on the meaning of artistry in a near-future cyberpunk landscape...(it) follows two streams of conflict. Paul and Kim battle with enormous robots which is, frankly, awesome. Mr. Maughan knows how to write an action sequence without letting it take over. The battles are short, streamlined, vicious and very, very fun...this is the crown jewel of an excellent collection. I'm a sucker for sports movies, especially when the game or match has some sort of Great Significance. Mr. Maughan tugs at my heartstrings with Havana Augmented - a giant robot smackdown with a country's future on the line." - Pornokitsch.com "I loved Paintwork. All three stories show a writer with a real gift for accelerating the world we know into a believable future, with a deft local touch that adds an extra something for us Bristol folk...(it's) a great read, that pinches a few ingredients from the SF greats and blends them with a unique flavour all of its own." - Guide2Bristol Augmented reality street artist 3Cube wants to break into the mainstream, and as one of the best in the graffiti mecca of Bristol he stands a real chance. Except that someone, some unseen rival, seems set on using even the most old-fashioned of methods to stop him from succeeding. John Smith was successful once, if only for a fleeting moment. Now the documentary film maker is broke and jobless, and finds himself putting his life on the line as one of the new-breed of paparazzi - snapping celebrity video gamers in virtual worlds. And on the sun-bleached streets of Havana two young Cubans find themselves locked in a fierce struggle with one of the world's most powerful organisations, as a seemingly innocent video game tournament becomes a fight for both personal and national pride. Paintwork is a collection of three stories from our imminent future by British science fiction author Tim Maughan, including the 2010 BSFA Short Fiction Award nominated 'Havana Augmented'