Download or read book Etude de l int grit du signal dans les dispositifs millim triques associ s aux antennes written by Anne Chousseaud and published by . This book was released on 2000 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA SATURATION GRADUELLE DES BANDES DE FREQUENCE CONVENTIONNELLES ET LES CONTRAINTES DE MINIATURISATION ONT PROGRESSIVEMENT CONDUIT A DEVELOPPER DES DISPOSITIFS FONCTIONNANT A DES FREQUENCES DE PLUS EN PLUS ELEVEES. CE MEMOIRE EST CONSACRE A LA MODELISATION NUMERIQUE ET A L'ETUDE ELECTROMAGNETIQUE, PAR LA METHODE DES DIFFERENCES FINIES, DE SYSTEMES ASSOCIES AUX ANTENNES ET FONCTIONNANT AUX FREQUENCES MILLIMETRIQUES 30 GHZ ; 300 GHZ. IL S'ATTACHE A METTRE EN EVIDENCE LES PHENOMENES QUI APPARAISSENT AVEC LA MONTEE EN FREQUENCE ET NUISENT A L'INTEGRITE DU SIGNAL. C'EST LE CAS DES SOURCES D'ATTENUATION DANS LES CONDUCTEURS, DANS LES DISCONTINUITES DE LA STRUCTURE OU DES INTERACTIONS DE COUPLAGE ENTRE ELEMENTS METALLIQUES. CES DIFFERENTES ETUDES ONT ETE MENEES DANS LE CAS D'UN RESEAU D'ANTENNES IMPRIMEES ET ONT CONDUIT A LA VALIDATION D'UN OUTIL PERMETTANT DE MODELISER LES PERTES DE CONDUCTION DIRECTEMENT DANS LE CODE DE CALCUL FDTD. PAR AILLEURS, IL N'EST PAS TOUJOURS POSSIBLE, MALGRE LA PUISSANCE DES CALCULATEURS ACTUELS, DE SIMULER CES STRUCTURES INTEGRALEMENT DU FAIT DE LEUR COMPLEXITE, DES VOLUMES ET DES TEMPS DE CALCUL MIS EN UVRE. AUSSI, EST-IL INTERESSANT DE POUVOIR REMPLACER LES SOUS-RESEAUX DE LA STRUCTURE, PAR LEUR IMPEDANCE EQUIVALENTE, AFIN DE LES SIMPLIFIER. LA PRESENCE DE COMPOSANTS ACTIFS DANS UN CIRCUIT PEUT AUSSI CONSTITUER UNE PERTURBATION. LEUR MODELISATION ET CELLE DES CONNEXIONS, QUI DOIVENT ETRE A LA FOIS REALISTES ET ADAPTEES, EST ALORS NECESSAIRE. CES TRAVAUX SE SONT ACHEVES PAR LE DEVELOPPEMENT DE COMPOSANTS DE TYPE C.M.S. (COMPOSANTS MONTES EN SURFACE) AUX FREQUENCES MILLIMETRIQUES ET REUTILISANT LES OUTILS DE FABRICATION STANDARDS. DES PHENOMENES LIES A LA MONTEE EN FREQUENCE ONT ETE MIS EN EVIDENCE (MODES DE CAVITE, EFFETS DE COUPLAGE ENTRE LES ACCES DE POLARISATION).
Download or read book Historical Dictionary of Iran written by John Henry Lorentz and published by Historical Dictionaries of Asia, Oceania, and the Middle East. This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.
Download or read book Historical Dictionary of Pakistan written by Shahid Javed Burki and published by . This book was released on 1999 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pakistan is unlike most other countries in the emerging world. It is one of the two nations – the other being the state of Israel – founded on the basis of religion. Although it was created to provide a homeland for the Muslim community of British India, in its original form it was able to accommodate only about half of the people of Islamic faith who lived in the subcontinent. Pakistan’s birth in 1947 resulted in one of the largest movements of people in human history when some 14 million people left their homes, with 8 million Muslims leaving India for what is now Pakistan and 6 million Hindus and Sikhs moving in the opposite direction. This was the first large-scale incidence of ethnic cleansing the world was to witness. --
Download or read book Water Treatment Handbook written by and published by . This book was released on 2007 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
