Étude, conception et caractérisation de nouvelles topologies d'antennes à résonateurs diélectriques

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Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (12 download)

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Book Synopsis Étude, conception et caractérisation de nouvelles topologies d'antennes à résonateurs diélectriques by : Kaoutar Allabouche

Download or read book Étude, conception et caractérisation de nouvelles topologies d'antennes à résonateurs diélectriques written by Kaoutar Allabouche and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: De nos jours, la croissance du trafic d'informations entraine un développement technologique spectaculaire dans le domaine des télécommunications, qu'il s'agisse de réseau cellulaire, télévision, satellite, WIFI ou autres applications. Cette révolution a engendré d'énormes besoins et suscite une évolution technologique prodigieuse dans le domaine de la conception des antennes. Ces dernières se doivent de répondre aux différentes exigences, telles que la diminution de l'encombrement et des interférences électromagnétiques, la robustesse à l'environnement proche, l'augmentation du gain, l'élargissement de la bande passante, l'intelligence, etc. Les travaux menés dans cette thèse s'orientent surtout vers la conception de nouvelles topologies d'antennes simples, à faible encombrement, intelligentes, insensibles à l'environnement, large et ultra large bande... Notre intérêt s'est porté sur les antennes à résonateurs diélectriques (ARD). Dans le domaine de l'internet des objets, nous avons conçu et réalisé une antenne filtre, à base d'une jonction fente-résonateur diélectrique de forme rectangulaire en vue d'une intégration dans les dispositifs dédiés à ces applications. Pour des applications liées à la télémétrie, et plus précisément les compteurs intelligents, nous avons conçu et réalisé une antenne à base d'un résonateur diélectrique de forme cylindrique. Ces antennes intégrées dans des dispositifs où les sources de perturbations sont très présentes, ont montré une grande robustesse et une insensibilité à leur proche environnement. Par ailleurs, nous avons proposé deux nouvelles topologies d'antennes larges et ultra larges bandes. La première est un anneau cylindrique, constitué de quatre quartiers avec deux permittivités différentes. Un gap d'air a été introduit séparant le résonateur en deux. Cette structure innovante, confère à notre antenne une large bande et des caractéristiques de rayonnement stables. Cette antenne a servi comme élément de base pour proposer une antenne réseau agile en diagramme de rayonnement. La seconde, est dans la continuité de la première structure pour laquelle nous avons adopté une nouvelle technique d'alimentation ainsi qu'une diminution des dimensions du plan de masse. L'antenne obtenue propose alors des caractéristiques adaptées à des applications ultra large bande.

Quantum Mechanics, Volume 3

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Publisher : John Wiley & Sons
ISBN 13 : 3527345558
Total Pages : 790 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji

Download or read book Quantum Mechanics, Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Unidentified

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Publisher : Career Press
ISBN 13 : 9781601633422
Total Pages : 0 pages
Book Rating : 4.6/5 (334 download)

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Book Synopsis Unidentified by : Robert Salas

Download or read book Unidentified written by Robert Salas and published by Career Press. This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1969 the U.S. Air Force issued a statement that read' "No UFO reported, investigated and evaluated by the Air Force was ever an indication of threat to our national security." This statement is patently false. It has been proven untrue by the testimony of many military officers and airmen and documentation of incidents involving UFOs and nuclear weapons, testimonies of which the U.S. Air Force was fully aware. Unidentified details many of these testimonies, some for the first time. As partial justification for its position, the Air Force cites a University of Colorado study that was contracted and paid for by federal funds. Unidentified reveals how this study was actually just another part of the plan to cover up the reality of the UFO phenomenon. For the first time, Unidentified publishes evidence that the investigators for the Colorado study knew about the UFO-related missile shutdown incidents but did not investigate them or include them in their final report.

Lost Secrets of the Sacred Ark

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Publisher : HarperCollins UK
ISBN 13 : 000714296X
Total Pages : 466 pages
Book Rating : 4.0/5 (71 download)

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Book Synopsis Lost Secrets of the Sacred Ark by : Laurence Gardner

Download or read book Lost Secrets of the Sacred Ark written by Laurence Gardner and published by HarperCollins UK. This book was released on 2004 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Ark of the Covenant is the source of one of the deepest mysteries of the Western world. Laurence Gardner has accessed Rosicrucian archives to reveal where the Ark is, what it is and how this lost secret of the distant past has led to the phenomenal new science of space-time manipulation.

UFOs are Real

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Publisher : S.P.I. Books
ISBN 13 : 9781561719723
Total Pages : 0 pages
Book Rating : 4.7/5 (197 download)

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Book Synopsis UFOs are Real by : Clifford E. Stone

Download or read book UFOs are Real written by Clifford E. Stone and published by S.P.I. Books. This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Encounter with Tiber

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Publisher : Open Road Media
ISBN 13 : 1480421537
Total Pages : 802 pages
Book Rating : 4.4/5 (84 download)

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Book Synopsis Encounter with Tiber by : Buzz Aldrin

Download or read book Encounter with Tiber written by Buzz Aldrin and published by Open Road Media. This book was released on 2013-05-28 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Apollo 11 astronaut and the Nebula Award–nominated author of Directive 51 present a novel that “conveys the wonder and promise of space” (Publishers Weekly). Born the year of the Moon landing, Chris Terence spends his life fighting to return humanity to that pinnacle. An engineering student with dreams of spaceflight, he finds upon graduation that the United States no longer has need for astronauts. Years of bureaucratic meddling have reduced the space program to a shell of itself, and it will take the greatest scientific find in history to send humanity skyward once more. After years battling budget hawks, Chris finally gets his chance to walk on the Moon. While there, he finds evidence of an ancient alien civilization, the Tiberians, who visited Earth’s satellite eight thousand years before. Understanding what happened to those long-forgotten travelers will define the lives of Chris and his son, as they fight against all odds to unlock the secrets of the universe. “The collaboration of the first man to pilot a moon lander (Aldrin) with a major voice in contemporary science fiction (Barnes) has produced a fascinating chronicle of man’s first encounter with alien intelligence” (Booklist).