WorldCat Identities

Delaveaud, Christophe

Overview
Works: 19 works in 21 publications in 2 languages and 24 library holdings
Roles: Opponent, Other, Thesis advisor, Author
Publication Timeline
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Most widely held works by Christophe Delaveaud
Etude d'une nouvelle classe d'antenne imprimee a rayonnement monopolaire.Application aux telephones mobiles by Christophe Delaveaud( Book )

3 editions published in 1996 in French and held by 3 WorldCat member libraries worldwide

CE MEMOIRE PRESENTE L'ETUDE THEORIQUE ET EXPERIMENTALE D'UN MODE DE FONCTIONNEMENT ORIGINAL DES ANTENNES IMPRIMEES LIE A LA PRESENCE D'UN OU PLUSIEURS FILS DE MASSE CONNECTANT LE TOIT DE L'ANTENNE A SON PLAN DE MASSE. LES DIFFERENTES ANALYSES THEORIQUES SONT EFFECTUEES A L'AIDE D'UN LOGICIEL DE CALCUL RESOLVANT LES EQUATIONS DE MAXWELL DANS LE DOMAINE TEMPOREL SELON LA METHODE DES DIFFERENCES FINIES. POUR PERMETTRE L'ETUDE DE L'ANTENNE, DES DEVELOPPEMENTS ONT ETE APPORTES AU LOGICIEL EXISTANT. ILS CONCERNENT LA TECHNIQUE DE CALCUL DU CHAMP RAYONNE A L'INFINI, LA METHODE DE MODELISATION DES FILS FINS ET LE CALCUL DES CONDITIONS DE STABILITE DE L'ALGORITHME LIEES AU TRAITEMENT DES FILS. L'ETUDE DU COMPORTEMENT SINGULIER AUX BASSES FREQUENCES DES ANTENNES IMPRIMEES MUNIES DE FILS DE MASSE EST L'OBJET D'UNE ANALYSE ELECTROMAGNETIQUE APPROFONDIE. ELLE EST ACCOMPAGNEE D'UNE INTERPRETATION DES PHENOMENES PHYSIQUES ET ABOUTIT A LA MISE AU POINT D'UN NOUVEAU MODE DE FONCTIONNEMENT DE CES ANTENNES. DIFFERENTS DEVELOPPEMENTS SONT PRESENTES AFIN D'AMELIORER ET D'ETENDRE SES PERFORMANCES. LES ELEMENTS PERMETTANT DE CONCEVOIR UNE ANTENNE INTRINSEQUEMENT ADAPTEE A SON GENERATEUR SONT PRESENTES ET LES PERFORMANCES REALISABLES AVEC CE TYPE DE DISPOSITIF RAYONNANT SONT VALIDEES PAR LES MESURES EFFECTUEES SUR DIFFERENTS PROTOTYPES. FINALEMENT, LE NOUVEAU CONCEPT D'ANTENNE EST APPLIQUE AVEC SUCCES A LA REALISATION D'UNE ANTENNE MINIATURE INTEGREE SUR UN COMBINE TELEPHONIQUE MOBILE. L'INFLUENCE EXERCEE PAR LE CONTEXTE D'UTILISATION TRES PARTICULIER SUR LE FONCTIONNEMENT DE L'ANTENNE EST ETUDIEE THEORIQUEMENT ET EXPERIMENTALEMENT
Contribution à l'étude d'antennes miniatures reconfigurables en fréquence par association d'éléments actifs by Sarah El Kadri( )

1 edition published in 2011 in French and held by 2 WorldCat member libraries worldwide

Dans un contexte de généralisation des systèmes de communication sans fil, le besoin de miniaturiser les antennes pour permettre leur intégration sur de petits objets aux fréquences UHF est croissant. A ces fréquences, l'antenne est le composant le plus volumineux et sa miniaturisation constitue un des défis actuels les plus importants des concepteurs d'objets communicants. Cependant la miniaturisation des antennes s'accompagne généralement d'une dégradation de son efficacité et de sa bande passante. Par conséquent, les structures miniatures généralement conçues résultent d'un compromis entre bande passante, efficacité et taille électrique. Afin de palier à ce problème de bande passante, la technique d'agilité fréquentielle peut s'avérer intéressante pour certains systèmes de communication sans fils. Les travaux de ce mémoire s'inscrivent dans la continuité des recherches sur les antennes à la fois miniatures et performantes. Le premier objectif de cette thèse est d'étudier et de développer une antenne miniature originale susceptible de répondre aux besoins des systèmes sans fils actuels. Le deuxième axe de recherche s'intéresse à la reconfigurabilité fréquentielle de l'antenne miniature initialement développée. La reconfigurabilité ou l'agilité fréquentielle constitue une solution intéressante pour pallier au problème de la bande passante réduite liée à la miniaturisation. Les développements présentés se sont appuyés sur des simulations électromagnétiques, des modélisations et des expérimentations visant à valider les résultats marquants obtenus
Contrôle du rayonnement des antennes miniatures by Kawtar Belmkaddem( )

1 edition published in 2015 in French and held by 2 WorldCat member libraries worldwide

In the current context where the evolution of communicating objects is important indifferent growing fields such as: localization, wireless multimedia systems, etc., controlling theradiation pattern of antennas is one of the most important issues for future radio communicationsystems. In recent years, despite the growth experienced in the areas of antennas, the issue of smallantennas radiation control knows several barriers preventing their deployment. This thesis focuses onthe analysis of the problem of controlling the radiation pattern of small antennas and aims to raisesome questions about a little-explored subject of study. This work gives an approach using differenttechniques to develop new concepts of controlling the radiation pattern of antennas
Objets communicants : miniaturisation des frontaux RF par co-conception by Rafi Bourtoutian( Book )

1 edition published in 2009 in French and held by 2 WorldCat member libraries worldwide

With the recent technological advances, the concept of smart communicating object has become a reality. Currently, two technical constraints reduce the deployment in our societies of these smart objects or wireless sensor networks : their size and consumption. The antenna constitutes one the most cumbersome parts of such an object. The miniaturization of the antenna by conventional methods leads to increased consumption. The aim of the thesis is to explore the potentials offered by the co-design of miniature antennas and radio frequency components in order to reduce the size of these devices and achieve a fabrication near to the integrated circuits. Thus, multifunction antennas have been achieved by co-designing the antenna with other features of the radio interface (filters, baluns, low noise amplifiers ...)
Étude et conception d'antennes à base de métasurfaces destinées aux applications spatiales et aéronautiques by Badr Eddine Ratni( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

This thesis aims at highlighting recent advances in the field of metasurfaces. These structures have been used to improve the performances of conventional antennas or to design new antenna concepts. The work has been carried in the framework of a collaboration with industrial partners, namely Airbus Safran Launchers, Airbus Group Innovations and CNES. The manuscript is organized into two parts. The first part is devoted to metasurfaces used as partially reflecting surfaces (PRS) to design Fabry-Perot cavity antennas. In this part, an analytical model allowing to predict the beam steering angle by a phase modulation along the PRS is developed. Then, a new concept of metasurface allowing to steer the main antenna beam is proposed. It consists in applying a phase gradient by varying the effective index of the substrate that constitutes the PRS. The second part of this thesis is devoted to the design of an active metasurface that allows emulating different functionalities. First, the metasurface is utilized as a reflector with frequency and steering reconfigurability characteristics. Then, this metasurface is used as a reconfigurable polarizer where linearly polarized incident waves are converted into circularly polarized ones. Finally, the last study concerns the use of the active metasurface for the design of reconfigurablecylindro-parabolic and corner reflector antennas
Caractérisation et conception d'antennes isotropes miniatures pour objets communicants by Mathieu Huchard( )

1 edition published in 2007 in French and held by 1 WorldCat member library worldwide

Les progrès réalisés dans les domaines des réseaux de capteurs disséminées, de l'identification radiofréquence ou des communications millimétriques présagent l'apparition de petits objets, intelligents, autonomes et communiquant par le biais de transmissions radiofréquences. Dans ce contexte, les orientations aléatoires et variables des dispositifs les uns par rapport aux autres engendrent de fortes variations du bilan de transmission en raison de l'anisotropie de rayonnement ainsi que des désadaptations de polarisation entre antennes. Il existe donc un besoin pour de petites antennes bas coût aux caractéristiques de rayonnement optimisées pour une transmission indépendante de leurs orientations relatives. La première partie de ce travail a consisté à proposer un nouveau critère, appelé fonction de couverture isotrope, permettant de caractériser rigoureusement les performances des antennes dans un tel contexte. Cette méthode a permis de comparer diverses antennes de la littérature et d'étudier les effets de leurs propriétés de rayonnement. L'influence de l'environnement de propagation a également été étudiée. La seconde partie a consisté à proposer deux nouvelles antennes répondant à cette problématique tout en prenant en compte les fortes contraintes d'intégration et de miniaturisation. Un prototype a été réalisé et valide l'approche de conception suivie. Finalement, un dernier développement envisage le cas des multi antennes. Une extension de la méthode de caractérisation est proposée. L'une des structures précédentes est développée en deux versions à deux accès et illustre le principe d'une antenne isotrope à double polarisation orthogonale aux performances optimales
Conception d'antennes miniatures intégrées à leur support pour applications en télémédecine mobile by Hafedh Hamouda( )

1 edition published in 2014 in French and held by 1 WorldCat member library worldwide

This thesis presents the design and the optimization of miniature antennas integrated in specific devices dedicated to ensure communications between medical implants and a mobile phone in the context of telemedicine applications. However, the miniaturization of antennas necessarily implies a degradation of efficiency and bandwidth, which makes it difficult for implementation. Then, the design of electrically small antennas requires a very good understanding of the physical phenomena such as the theoretical limits of performance in terms of bandwidth and efficiency that can be expected for a radiating element with given dimensions. Furthermore, the performance of an electrically small antenna is also highly dependent on the environment in which it is mounted. Therefore, its interaction with each part of its close environment was highlighted and analyzed
Façonnage des ondes : de la superdirectivité à la superrésolution. by Samuel Métais( )

1 edition published in 2019 in French and held by 1 WorldCat member library worldwide

Durant cette thèse nous nous sommes intéressés à la physique des ondes globale. En repartant de l'équation de d'Alembert, il émerge trois leviers principaux qui permettent le contrôle des ondes : contrôle sur les sources, contrôle sur les conditions aux limites, et contrôle sur le milieu de propagation lui-même. Dans un premier lieu, nous avons utilisé les propriétés d'une métasurface binaire électroniquement reconfigurable en cavité micro-ondes. Cet objet permet de contrôler le champ au sein de la cavité. Celle-ci a ensuite été ouverte, et nous avons montré que le contrôle s'étendait à l'émission en champ lointain. Ce système réalise donc une antenne compacte directive et reconfigurable. Dans un second temps, nous avons considéré l'approche métamatériaux pour réaliser une antenne dite superdirective. En effet, les antennes sont soumises à des limitations de directivité liées à leur taille, dont la prédiction date des années 40. En utilisant un milieu de fils, nous avons montré que ce métamatériau qui permet le contrôle du champ proche à une échelle sub-longueur d'onde, peut influencer le rayonnement d'une source unique au point de réaliser une antenne superdirective avec seulement quatre diffuseurs résonants passifs. Enfin, nous avons réalisé en acoustique une preuve de concept d'une nouvelle technique d'imagerie non-linéaire. Depuis l'illumination structurée, c'est l'imagerie d'agents de contraste, souvent fluorescent, qui permet de battre la limite de diffraction. Ici, nous proposons une idée basée sur l'effet Doppler. Nous montrons dans un premier temps qu'imager avec des sources et des récepteurs en rotation permet d'égaler au moins l'illumination structurée. Dans un second temps, nous montrons que cette rotation génère une information spectrale supplémentaire qui permet d'atteindre la super-résolution
Contribution au développement d'antennes miniatures intégrant des fonctionnalités de capteurs by Victor Engelhardt( )

1 edition published in 2018 in French and held by 1 WorldCat member library worldwide

The Internet of Things is a promising research area for the next years. 50 billions of connected objects are expected in 2020. Among them, wireless sensors are required for appli- cations like body and environmental monitoring. This implies a lot of research works such as size reduction, efficiency im- provement and energy harvesting. The variety of applications and environments leads to a huge panel of constraints. In this context, chipless and passive sensors present numerous advantages such as long lifetime, low cost and robustness. This thesis has two aims : show the interest of using electrically small antenna in wireless sensors and developpe a method to improve sensors performance (range and sensibilitty)
Analyse et optimisation d'antennes réseaux compactes superdirectives by Alexandre Debard( )

1 edition published in 2020 in English and held by 1 WorldCat member library worldwide

The purpose of this thesis is to study and seek improvement of the superdirective antenna array technology. This technology has been recently re-examined in the literature since it can bring some interesting functionalities in the future telecommunication applications. The examination of this type of antenna is thus conducted through the use of Spherical Wave Expansion which allows for the general study of directivity limits as well as gain limits, considering lossy antennas. The classical theory of end-fire array antennas is also reviewed, in the case of uniformly spaced tapered arrays, providing theoretical evaluation of efficiency and sensitivity to source feeding precision.Infinitesimal dipoles and Huygens sources are considered in a proposed development that links array theory and Spherical Wave Expansion. This contribution provides a formal proof for the directivity limit of Huygens-source-based end-fire arrays as well as an upper bound for the directivity of dipole-based arrays, when the inter-element spacing tends to zero. Moreover, it is shown how classical array theory can also be used to derive excitation coefficients that maximize gain rather than directivity, when loss resistances are considered. An examination over antenna size is also made to demonstrate which conditions are most favorable for the use of such supergain or superdirective end-fire array optimization.In a second part, practical implementations of superdirective antennas are surveyed, focusing on Huygens sources and compact end-fire array designs. The chosen implementation architecture of parasitic element arrays is then detailed and studied, in order to minimize the requirement for negative or positive resistive loads. This lead to the design and measurement of five prototypes that aim at achieving the maximum possible gain or directivity for a limited radiator size, with two-, three- and four-dipole end-fire arrays
Contribution au co-design et à la co-intégration de réseaux d'antennes actives multi-bandes pour systèmes de radionavigation par satellite by Johann Sence( )

1 edition published in 2019 in French and held by 1 WorldCat member library worldwide

This work takesplace in the context of developingelectronic systems for communications equipment, localization or monitoringequipment with a high integration density. The deployment of these systems must also meet a growing demand for flexibility in terms of frequencies, power or coverage. The frequency flexibility can be simultaneous with multiband devices or selective by reconfiguring the frequency band. The power flexibility enables to minimize consumption of the system and the coverage flexibility to direct the beam to the target to optimize the budget link or otherwise protect a source of noise. The increase in efficiency and compactness passes through the combination of elementary functions (LNA / filter / antenna) that reduces interconnect floors and considering the interactions between the different elements. The primary objective of this project is to develop a co-design methodology of the antenna with the associated circuits (filters and LNA) to achieve optimal performances (radiation,efficiency, ...) with an integrated and compact device
Transformations d'espaces et applications électromagnétiques dans les domaines optiques et micro-ondes by Paul-Henri Tichit( )

1 edition published in 2012 in French and held by 1 WorldCat member library worldwide

This phD work is an original and important contribution to the understanding of transformation optics and paves the way to the design of new electromagnetic structures. The coupling between this innovative technique and metamaterials has led to prototypes with unique properties. We have thus developed an invisibility polygonal cloak, an electromagnetic taper, a directional antenna and isotropic source. The realization of our high-directive antenna with this method is the only prototype in the literature that combines controlled variations of the permittivity and permeability from electric and magnetic resonators. The ultimate control of light from an engineering space will find its usefulness in fundamental research but also for engineers and developers who are looking for more precision in the design of electromagnetic devices
Antennes reconfigurables pour les applications mobiles et réseaux sans fil by Le-Huy Trinh( )

1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

In recent years, telecommunication technologies have enormous progress, especially cellular communications and wireless sensor networks. To meet the demand of increasing transmission capacity, improving quality of cellular communication channels, expanding the operating band of the equipment is necessary. As passive antenna has reached the limit on increasing the operating band with the small size, the use of frequency reconfigurable antenna is a feasible solution. Besides, in the applications of WSN, to reduce collisions, increase communication distance and optimize consumption, directional reconfigurable antenna is a good proposal. In this thesis we present several reconfigurable antenna structures. Firstly, a new component is introduced; digitally tunable capacitor (DTC). Thanks to its advantages, such parts are good candidate to be integrated in the antenna for cellular communication and wireless sensor network applications. After, several antennas are introduced include multiband antenna, MIMO and frequency reconfigurable antenna, which can be used to extend the operating frequency band of the communication system, optimize spectral efficiency and quality improve channel quality. The structures of these antennas are introduced together with the results of simulation and measurement for the purpose of solving the challenges given in the future cellular communications systems. And then, the proposed approach to the design of reconfigurable directional antennas is presented. Several reconfigurable directional antennas, which are used in applications of WSN, are introduced. Thanks to the use of directional antennas reconfigurable, performance of WSN system will be optimized
Conception de systèmes antennaires MIMO multi-standards LTE pour les nœuds relais by Lamia Sadaoui( )

1 edition published in 2018 in French and held by 1 WorldCat member library worldwide

To deploy the fourth generation called 4G/LTE or "LTE advanced", mobile operators face strong constraints: they must ensure a good geographic coverage but also an excellent quality of service. This requires new methods that go far beyond what has been implemented for GSM or 3G networks. The telecom industry has created the concept of "small cells" that reinforce the "macrocells" deployed by the operators. This thesis tries to provide a solution to this problem and more particularly through the development of antennas for a product called "smart cell". This study, supported by the FUI project NETCOM, should enable mobile operators to extend the coverage and capacity of their networks at a lower cost while maintaining a good quality of service. To do that, the aim of this thesis more particularly is the design of a multi-band multi-antennas MIMO system (Multiple-Input Multiple-Output) dedicated to relay nodes for the deployment of the fourth generation 4G/LTE or "LTE advanced". The antenna design considers the coverage of the three LTE operating frequency bands and must be compatible with them. The (700-900 MHz) frequency band is used for the LTE 700 and LTE 800 bands, (1710-1880 MHz) for the GSM 1800/LTE 1800 bands and the last (2500-2690 MHz) for the LTE 2600 bands. In our first study, a reference system with 4 access was studied in simulation and measured, for only the low band 700-900 MHz. In a second study, we tried to cover the other two higher bands to have a tri-band system using the parasitic elements to get a three-band MIMO system with 4 access. We studied then, the influence of the environment close to the antenna system, with the presence of a metallic radiator. As we often encounter a frequent problem in multi-antenna systems which is the coupling problem between the different access of a multi antenna system, so we have studied and realized a decoupling technique. This technique was used to enhance the isolation between the different access
Miniaturisation d'antennes très large bande pour apllication spatiales by Jérémy Valleau( )

1 edition published in 2016 in French and held by 1 WorldCat member library worldwide

De nos jours les applications spatiales nécessitent d'embarquer toujours plus d'équipements afin de rendre les missions les plus complètes possibles. Cependant l'espace à bord des satellites est une ressource limitée et par conséquent, la miniaturisation de l'électronique embarquée est une nécessité cruciale. Dans les applications embarquées couvrant plusieurs plages de fréquence différentes, l'utilisation d'antennes ultra large bande (ULB) est une solution classique et efficace pour limiter le nombre d'antennes et de circuits associés. Leur miniaturisation présente donc un enjeu scientifique majeur. Une technique de miniaturisation consistant à charger une antenne spirale d'Archimède par un empilement d'anneaux résonants et couplés a récemment été découverte [1]-[3]. Elle permet une diminution de l'ordre de 35% du diamètre de l'antenne sans dégradation notable des performances en rayonnement. Les travaux de cette thèse permettent d'affiner la compréhension physique du rôle joué par les anneaux dans le phénomène de miniaturisation. Un circuit électrique équivalent est élaboré sur la base d'équations intégrales utilisant des fonctions d'essai étendues et le concept d'impédance de surface réactive. Ce circuit permet de simuler la réponse électromagnétique des anneaux empilés et couplés 10 fois plus vite qu'en utilisant des logiciels de simulation commerciaux et rigoureux. Ce gain de temps est mis à profit pour tester un nombre de combinaisons importants de solutions parmi lesquelles il est possible d'identifier la structure optimale pour la miniaturisation de la spirale d'Archimède chargée par des anneaux empilés et résonants. Pour maximiser l'effet des anneaux résonants couplés dans la miniaturisation de l'antenne, le choix de la fréquence de résonance des anneaux est crucial. Cette fréquence doit être suffisamment basse et permettre à l'antenne de rester adaptée en impédance sur la bande de fréquence la plus large possible. La fréquence de résonance des anneaux dépend du périmètre déployé des anneaux. Ce périmètre est fixé par le choix du motif de base et par le nombre de ses répétitions le long des anneaux. Une méthode rapide pour choisir le motif le plus adapté à la conception de l'antenne miniaturisée est présentée. Cette méthode et le circuit électrique équivalent permettent la conception optimisée et rapide d'une antenne ULB miniature. La validation de cette méthodologie de conception s'est faite expérimentalement sur la base de plusieurs réalisations
Étude théorique et expérimentale d'un nouveau concept d'antenne VHF miniature et accordable par décharge plasma by Vincent Laquerbe( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

Antenna miniaturisation is a major issue, especially in the VHF band whose wavelengths are significant. Amongst the solution in the litterature, a recent theoretical technique relies upon the electrostatic resonance of negative permittivity (ENG) subwavelength spheres. In this work, the use of a plasma discharge as ENG medium is under consideration. Plasma indeed suggests new potentialities for this kind of small antennas, such as stealth and frequency agility. Firstly, several analytical models are developed to study the electromagnetic response of subwavelength realistic plasma spheres. These models further allow to derive accurate numerical representations that fit commercial electromagnetic solvers. A working prototype that comprises a plasma ignition system within the antenna structure without altering its operation is then designed. It is used to both characterize the plasma discharge and the electromagnetic behavior of the plasma spherical resonator. Finally, this work is extended to the case of planar circuits by integrating a plasma discharge inside microstrip resonators. The design, the modeling and the experimental studies of these resonators highlight the ability of the plasma to tune the resonant frequency
Conception d'un système antennaire multi-standard multi-applications dédié au module TRAXBOX pour le suivi de conteneurs by Tarik Faradi( )

1 edition published in 2016 in French and held by 1 WorldCat member library worldwide

This thesis presents the design of different small antenna systems, operating in harsh environmental and climatic conditions, but also be able to operate in several ISM frequency bands and several mobile communication standards. This antenna system designed to be integrated in the TRAXBOX modules developed by TRAXENS, must meet various technical, industrial and economic criteria, defined by their final application which is the monitoring of multimodal metallic containers. To this end, the system must provide a multiband and wideband operations, an omnidirectional radiation pattern, a good efficiency, a reduced size allowing an easy and efficient integration into its housing, mechanical rigidity allowing the system to be protected against vibrations and shocks, a wide operating temperature range and low manufacturing cost. These technical and manufacturing requirements are often difficult to simultaneously satisfy. To do this, several design techniques of multiband multi-antenna systems have been employed. The use of slots and parasitic elements has first allowed widening the antennas bands. Regarding the mutual isolation of the antennas, the insertion of slots on the ground plane is one of the techniques that improve the antennas isolation. However, in this manuscript, we have mainly focused on the optimal layout of the parasitic resonators to simultaneously increase the bandwidth but also optimize the system efficiency and the isolation between antennas after interpretation of the various physical phenomena observed
Conception d'antennes à base de métal liquide pour applications multiples by Mathieu Cosker( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

Today, electronic is an integral part of our lives. Indeed, more and more objects integrate electronics to connect each other, this is the Internet of Things (IoT). All of these wireless devices need one or more antennas. Furthermore, It's useful to develop new materials to realize new antennas that fit with new constraints: smaller and flexible objects, more and more sensors and less and less consuming.In this context, we have focused this research on antenna structures based on metals which are liquid at room temperature to realize conformable antennas of complex shapes combining 3D printing, reconfigurable antennas and radiant structures with the ability to sensor. In this manuscript, antenna prototypes with these characteristics have been simulated, realized and measured
Traçabilité RFID à l'aide de petites antennes : application au cas des instruments chirurgicaux : étude et validation d'une solution prototype by Megdouda Benamara( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

The ARTIC project, concerns the implementation an automatically system used to Tracking Surgical Instruments with Radio Frequency Identification in hospitals, more precisely particular in sterilization and operating room. The development of such solution needs to solve several problems. The control of the instruments must be rapid and adapted to the sterilization: autoclave sterilization (121-138 ° C, 1-2 bar). The specification must combine ergonomics, autoclave resistance and reliability, while being fast and generating low additional cost. Moreover, such a solution must allow multiple control (identification of several instruments at a time) in all possible spatial directions. The thesis on RFID tracking using small antennas aims to propose prototype solutions based on the magnetic coupling between reader and the tag loops. The purpose of the prototype optimization is to reach a communication distance up to 10 cm using a large reader loop antenna (the size of the sterilization trays: 50 cm length) and a miniature tag (few millimeters). Several prototypes are proposed and developed. (1) a prototype of the reader loop antenna including resonators, which allows to increase the magnetic coupling of the RFID system. This structure is simulated, realized and measured. In order to make a link between simulation and measurement, we developed calculations of the equivalent electrical model that allow to find the equivalent inductance of the N-loop reader antenna and also the equivalent mutual inductance of the system entire system. (2) Another solution is a multiple twisted loop reader antenna. It is based on the reorientation of the magnetic field lines. Its interest is to allow a detection of the tags whatever their angular positioning
 
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