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     <dc:title xml:lang="en">Contributions to the theory of non diffractive waves and synthesis of metallic Bessel beam/X-wave launchers</dc:title>
     <dcterms:alternative xml:lang="fr">Contributions à la théorie des ondes non diffractives et synthèse des lanceurs métalliques de faisceaux de Bessel/ondes X</dcterms:alternative>
     <dc:subject xml:lang="fr">Faisceaux de Bessel</dc:subject><dc:subject xml:lang="fr">ondes X</dc:subject><dc:subject xml:lang="fr">adaptation de modes</dc:subject><dc:subject xml:lang="fr">focalisation en champ proche</dc:subject><dc:subject xml:lang="fr">ondes non-diffractives</dc:subject><dc:subject xml:lang="fr">impulsion</dc:subject><dc:subject xml:lang="fr">faisceaux de Bessel–Gauss</dc:subject><dc:subject xml:lang="fr">transfert d’énergie sans fil</dc:subject><dc:subject xml:lang="fr">antennes cornets</dc:subject><dc:subject xml:lang="fr">calcul électromagnétique</dc:subject><dc:subject xml:lang="fr">méthode des moments</dc:subject>
     <dc:subject xml:lang="en">Bessel beams</dc:subject><dc:subject xml:lang="en">mode-matching</dc:subject><dc:subject xml:lang="en">near–field focusing</dc:subject><dc:subject xml:lang="en">non-diffractive waves</dc:subject><dc:subject xml:lang="en">X–waves</dc:subject><dc:subject xml:lang="en">Bessel–Gauss beams</dc:subject><dc:subject xml:lang="en">wireless power transfer</dc:subject><dc:subject xml:lang="en">horn antennas</dc:subject><dc:subject xml:lang="en">computational electromagnetics</dc:subject><dc:subject xml:lang="en">Method of Moments</dc:subject><tef:sujetRameau><tef:vedetteRameauNomCommun>
						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="15888437X">Communication en champ proche</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027393070">Ondes électromagnétiques</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027869962">Bessel, Fonctions de</tef:elementdEntree>
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     <dcterms:abstract xml:lang="fr">Cette thèse présente les contributions de l'auteur au domaine des ondes non-diffractives. Essentiellement, les ondes non diffractives sont des faisceaux électromagnétiques qui rayonnent une énergie localisée avec une variété d'applications pratiques potentielles. Le travail présenté dans cette thèse peut être divisé en deux parties. Dans la première partie, un nouveau concept de synthèse de lanceurs de faisceaux de Bessel/ondes X à profil spline a été proposé. Tout d'abord, un outil basé sur l'adaptation de mode est présenté. L'outil est capable d'évaluer les paramètres S, les diagrammes de rayonnement en champ proche et lointain de structures métalliques à symétrie azimutale. Ensuite, des lanceurs métalliques à faisceau de Bessel/ à impulsion sont synthétisés à l'aide de cet outil ad hoc. Le concept a été validé expérimentalement en fabriquant et en mesurant un lanceur pour fonctionner dans une gamme de fréquences de 75 à 105 GHz. Le lanceur est la première démonstration d'un lanceur d'ondes X à de telles fréquences. Dans la deuxième partie, nous avons étudié l'utilisation d'ondes non diffractives pour le transfert d'énergie sans fil. Tout d'abord, l'utilisation de faisceaux de Bessel-Gauss pour le WPT est étudiée. Les performances supérieures des faisceaux de Bessel-Gauss par rapport aux faisceaux de Bessel sont démontrées. Un lanceur Bessel-Gauss a été conçu pour valider cette affirmation. Le coefficient de transfert de puissance du lanceur dépasse 50 % pour les distances dépassant sa portée de non diffraction.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">This thesis present the author’s contributions to the field of non-diffractive waves. Essentially, non-diffractive waves are electromagnetic beams that radiate localized energy with a variety of potential practical applications. The work presented in this thesis can be divided into two parts. In the first part, a novel concept of synthesizing metallic spline profiled Bessel beam/X-wave launchers has been proposed. First, an ad-hoc tool based on mode matching is presented. The tool is capable of evaluating the S parameters, near-, and far-field radiation patterns of metallic structures with azimuthal symmetry. Then, metallic Bessel beam/X-wave launchers are synthesized using the ad-hoc tool. The concept has been experimentally validated by manufacturing and measuring an X-wave launcher operating in a 75-105 GHz frequency range. The fabricated launcher is the first experimental demonstration of an X-wave launcher at such frequencies. In the second part, we have investigated the use of non-diffractive waves for wireless power transfer. First, the use of Bessel-Gauss beams for WPT is investigated. The superior performance of Bessel-Gauss beams compared to Bessel beams is demonstrated. A Bessel-Gauss launcher has been designed for validating this claim. The power transfer coefficient of the launcher exceeds 50% for distances exceeding its non-diffractive range.</dcterms:abstract>
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