WorldCat Identities

Staraj, Robert

Overview
Works: 41 works in 58 publications in 2 languages and 510 library holdings
Roles: Thesis advisor, Other, Opponent, Editor, Contributor, Author
Publication Timeline
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Most widely held works by Robert Staraj
Non-standard antennas by François Le Chevalier( )

11 editions published between 2011 and 2013 in English and held by 429 WorldCat member libraries worldwide

This book aims at describing the wide variety of new technologies and concepts of non-standard antenna systems - reconfigurable, integrated, terahertz, deformable, ultra-wideband, using metamaterials, or MEMS, etc, and how they open the way to a wide range of applications, from personal security and communications to multifunction radars and towed sonars, or satellite navigation systems, with space-time diversity on transmit and receive. A reference book for designers in this lively scientific community linking antenna experts and signal processing engineers
Antennes non-standard nouvelles technologies pour les architectures de capteurs( Book )

1 edition published in 2010 in French and held by 25 WorldCat member libraries worldwide

Antennes multistandards pour communications mobiles by Pascal Ciais( Book )

2 editions published in 2004 in French and held by 2 WorldCat member libraries worldwide

This thesis presents the design, the optimisation and the analysis of small antennas dedicated to mobile and wireless communication standards. These antennas must satisfy several criteria which are often hard to simultaneously obtain : multiband and wide band operations, omnidirectional radiation pattern, good efficiency, small size allowing their integration into a mobile handset. Different techniques are used to achieve these characteristics like the addition of shorting strips, slots, parasitic elements and distributed capacitive loads. The simultaneous implementation of these techniques has led to the design of a biband antenna (GSM/2 GHz), triband antennas (GSM/UMTS-2,3 GHz ; GSM/DCS-PCS), quadband antennas for GSM/DCS-PCS-UMTS operations and lastly a multiband antenna (GSM/DCS-PCS-UMTS/5 GHz WLAN). All structures have been designed on a reduced ground plane having a size approximately equal to that of the PCB (Printed Circuit Board) of a typical mobile phone. Parametric studies allowed to interpret the physical phenomena and to estimate the influence of the different antenna's parameters. Measurement of several antenna prototypes validated the designed and optimised structures obtained by a simulation software tool
Contribution au développement de la technologie RFID sans puce à haute capacité de codage by Arnaud Vena( )

1 edition published in 2012 in French and held by 2 WorldCat member libraries worldwide

Malgré les nombreux avantages que procure la RFID, son déploiement demeure freiné par plusieurs facteurs aussi bien économiques, que technologiques. Parmi ces freins, on peut citer le coût encore trop élevé des tags, le manque de fiabilité et de sécurité dans les informations contenues dans la puce RFID mais aussi les aspects «recyclage» des tags. Dans cette thèse nous nous focalisons sur le développement de tags RFID sans puce, qui représentent une nouvelle famille de tags bas coût. Avec cette technologie, l'information est extraite à partir de la réponse électromagnétique du tag qui dépend uniquement de sa géométrie. Différentes solutions ont été développées dans le but d'augmenter la quantité d'informations, de réduire la surface du tag ou encore d'améliorer la robustesse de détection. Des considérations pratiques tel que l'aspect réalisation sur substrat papier, le développement d'un système de détection bas coût, ou encore l'aspect mesure dans un environnement réel on été adressés afin d'établir une preuve de concept. Des travaux sur la réalisation de capteurs RFID sans puce et sur le moyen de rendre un tag sans puce reconfigurable sont présentés en guise de perspective
De la RFID à la MMID 60 GHz : contribution au développement de l'identification par onde radiofréquence en bande millimétrique by David Hotte( )

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

With the opening of the 57-66 GHz band in Europe, new high data-rate wireless communication technologies are currently under development. Numerous advantages linked to the frequency band conducted to consider the transposition of the radiofrequency identificaion (RFID) principle to the millimeter frequency band: the MMID. The international regulations provide a common bandwidth of 5 GHz allowing universal solutions. Moreover, the communication security of point-to-point networks and the directivities of the antennas present interesting perspectives.The presented work in this thesis looks for contributing to the development of MMID. The work underlines the principal locks of this technology and it presents the different proposed solutions covering multiple aspects: conception of antennas and antennas arrays, conception of MMID tags prototypes, characterization and measurement methodology including the complete conception of a measurement bench in V-band, improvement of the tags performances and study of sensing functionalities integrated in the tags. Different prototypes of MMID tags are fabricated and passive communications based on the backscattering of the tags were demonstrated up to 20 cm. In addition, humidity and pressure sensing functionalities were proved by experimentations. The overall of these results pave the way for new perspectives for the wireless communication domain and sensors networks in the millimeter-wave band
Contribution au développement d'antennes intégrables aux vêtements : application aux gilets militaires by Fanamperana Tsitoha Andriamiharivolamena( )

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

Nowadays, the infantrymen of French army are equipped with a radio communication system when they are in field action. The antenna used to transmit and receive Radiofrequency (RF) signals is a monopole antenna called as whip antenna. It is placed parallel to the infantryman's body at the left clavicle. However, the whip antenna disrupts the field of view of infantrymen particularly when they turn their head to the left. Moreover, the position of the whip antenna bothers the left-handed infantrymen when they are in fire position. Finally, the whip antenna adds an additional weight to the infantrymen. Thus, it is obvious that the integration of the antenna into the military jackets allows to better meet the needs of infantrymen particularly in terms of ergonomy. However such an integration must also meet the needs in terms of radiation efficiency, spatial coverage and protection of the body against the antenna radiation. Moreover, the constraints of realization technology must be taken into account. The thesis is focused on the design and characterization of integrated antennas into military jackets. The research work is performed within the collaborative project GIANTE, supported by the DGA-RAPID frameproject, associating complementary partners: SAFRAN Sagem, laboratory LCIS, and ARDEJE. The work includes all the electromagnetic studies required by the environmental constraints by taking account the human body. It also includes the follow-up of the realizations made by ARDEJE that masters inkjet printing technologies. The RF characterization (impedance matching, bandwidth, radiation pattern) of antennas with a suitable bench test and the evaluation of global performances of antennas in functional environments (environment free from obstructions, urban areas, forest) are also part of the thesis work
Méthode de conception et optimisation d'antennes pour étiquettes RFID multi-standards by Plamen Iliev( Book )

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

La RFID est une technologie connue pour les opportunités qu'elle offre en termes d'identification de personnes, d'animaux ou d'objets. Cette technologie permet une identification rapide, efficace et peu coûteuse grâce à ses divers standards et types de fonctionnements. Dans un système RFID, la conception de l'étiquette et l'optimisation de son antenne restent des facteurs essentiels de sa fiabilité. Cette étude présente les différents types d'étiquettes RFID ainsi que diverses techniques permettant d'optimiser leurs antennes. Dans cette étude, nous nous intéressons particulièrement aux types de champs électromagnétiques mis en jeu et définissons des modèles d'antennes correspondants. Nous analysons également l'influence des paramètres environnementaux, notamment les matériaux de fabrication, et proposons différentes structures d'antennes adaptées. Enfin nous étudions, à l'aide de plusieurs modèles, la possibilité d'élaborer des étiquettes multistandards en maîtrisant le couplage de leurs antennes. Les paramètres de la conception d'étiquettes RFID sont ainsi spécifiés et contrôlés
Conception d'éléments rayonnants pour systèmes d'interrogation multi-antennaires en environnements de propagation difficiles et fortement bruités by Rafik Addaci( Book )

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

Les communications sans fil exigent des débits de plus en plus élevés et une meilleure qualité de signal. Ceci est d'autant plus vrai que l'on rencontre de plus en plus d'applications dans des milieux industriels pour lesquelles les perturbations sont bien plus sévères que dans d'autres milieux. Les solutions les plus prometteurs sont les techniques dites de diversité et de MIMO utilisant des multi-antennes. Elles ont largement démontré leur potentiel à combattre les phénomènes d'évanouissement et à augmenter la capacité des liaisons sans fil en milieux difficiles. Compte tenue des environnements électromagnétiques multi-trajets dans lesquels ils seront placés, nous avons conçu des systèmes pluri-antennaires ainsi que des éléments miniatures originaux, permettant de conserver des débits satisfaisants et ainsi améliorer la qualité des signaux reçus. Cependant, pour une efficacité optimale, l'isolation entre accès doit également être optimale. Différentes techniques d'isolation ont été étudiées. La première, simple et intuitive, a consisté à n'optimiser que la position et l'orientation relative des antennes sur le PCB. Elle est cependant conditionnée par la taille de l'objet communicant ce qui limite donc ses performances. Nous avons donc développé des techniques plus originales pour des antennes mono et bi-bandes. Elles consistent à insérer une ligne de neutralisation et un élément parasite, ou réaliser deux fentes sur le plan de masse. Les performances de ces systèmes montrent qu'ils peuvent être utilisés efficacement pour des applications en diversité et MIMO.0 Ces résultats ont été appliqués dans le cadre du projet BMCI (Bilan de Santé pour la Maintenance et la Conduite Intelligente) afin de concevoir un système antennaire compact dédié à des réseaux de capteurs pour navires
Conception d'une antenne bibande à large bande pour la téléphonie mobile by Jean-Marc Carrere( )

1 edition published in 2002 in French and held by 2 WorldCat member libraries worldwide

Radiowave propagation and antennas for high data rate mobile communications in the 60 GHz band by Sylvain Ranvier( Book )

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

The 60 GHz MIMO systems are seen as some of the best candidates for the implementation of future high data-rate short range communications systems such as wireless personal area networks (WPAN). Although the performance of MIMO systems has been studied thoroughly theoretically and experimentally at lower frequencies like at 2 and 5 GHz, there is a clear lack of measurement data and experimental performance evaluations of MIMO techniques at 60 GHz. Furthermore, more effort is still needed in the design and evaluation of compact low cost 60 GHz antennas for communication applications. In the first part of the thesis, the first 60 GHz MIMO channel measurement system is presented. It is based on a previously developed 2 and 5 GHz sounder and frequency converters. This system uses virtual antenna arrays to create the channel matrix. A measurement campaign is reported. In order to improve the delay resolution, two other MIMO measurement systems are presented, based on an ultra wide band (UWB) sounder and a vector network analyzer (VNA). Those systems allow full characterization of the MIMO channel in the delay and angular domains. In the second part of this work, the performance of multi-antenna techniques is evaluated based on the measurement data obtained in the first part of the thesis. Three of the most promising multi-antenna techniques, namely MIMO, antenna selection MIMO, and beam steering, are analyzed and compared. The presented results indicate that the mutual information of the measured MIMO channel is quite close to that of the independent and identically distributed (i.i.d.) MIMO Rayleigh channel. Furthermore, in realistic conditions it is seen that MIMO-antenna selection often leads to lower mutual information than traditional MIMO with the same number of RF chains. Moreover, it is shown that when considering phase shifters with realistic losses, MIMO technique almost always outperforms beam steering technique. In the last part of the thesis a 60 GHz planar omnidirectional antenna is presented. This antenna is very suitable for communications applications since it has low profile and uses a metal layer only on one side of the substrate. Therefore, it can be manufactured easily and at very low cost. In addition, an advanced quasi full 3-D radiation pattern measurement system has been developed to evaluate probe-fed antennas. Very good measurement repeatability is reported. The radiation of the probe is analyzed and is seen to be the main limitation of the dynamic range of the measurement setup
Conception d'un système d'antennes pour la localisation en temps réel avec réseau de capteurs sans fils. by Evanaska Maria Barbosa Nogueira( )

1 edition published in 2013 in French and held by 2 WorldCat member libraries worldwide

Real-Time Locating Systems (RTLS) have been increasingly employed by the industry. They allow the automation of several tasks such to identify and track objects throughout the supply chains, to watch equipment under surveillance in factories and to secure goods. These systems are usually based on low-power and low-cost wireless electronic sensors with integrated antennas. In our context, two types of sensors are used. The reference tags are generally fixed on the walls whereas mobile tags are fixed on objects that must be tracked. In particular, our RTLS uses the Received Signal Strength Indication (RSSI) to compute the location of mobile tags at 2.4GHz frequency band. However, the performance of such system can be influenced by several factors. On the one hand, the non-uniformity of the radiation pattern and the antenna polarization mismatch can affect the received signal power. On the other hand, the impact of the environment results in multipaths, which degrade the localization precision. In the first part of this thesis, we propose an approach based on a metal plane reflector to improve the radiation pattern of reference tags. We performed several experiments using a microwave simulator and we show that the metal plane reflector considerably improves the localization accuracy of our system. In the second part, we propose to use antenna diversity techniques on mobile tags to minimize multipath effects while improving the radiation pattern. Our three solutions are based on integrated antennas fixed on the tag's plastic case, combining pattern and polarization diversity. Firstly, we propose a structure composed of three Planar Inverted-F Antennas (PIFAs) manufactured and fixed outside of the plastic case. Secondly, we propose a system composed of two Inverted-F Antennas (IFAs). Then, we propose a system composed of a triangular patch antenna on a substrate that allows it to be fixed inside the plastic case. We simulated those systems in different scenarios to analyze and validate the localization improvements brought by our solutions. Finally, we performed real experiments to compare the efficiency of the proposed systems in a real environment. Our results show that the localization error was reduced approximately by a factor of three in comparison to the original system
Antennes multistandards combinées à polarisations multiples pour les applications spatiales by Grégory Beddeleem( Book )

2 editions published in 2008 in French and held by 2 WorldCat member libraries worldwide

Nowadays, electronical systems advise more inventions, more services and these systems shall be as small as possible. At the hands of increasing the number of standards such as GSM, GPS, SDARS, Bluetooth and WLAN, new antennas have to cover a lot of bandwidths with a low profile. Performed within the cooperation between RADIALL company and LEAT laboratory, my studies presented in this report talk about combined multi-standards antennas with multiple polarizations for space reception applications. The difficulty of this study concerns the combination of linear and circular polarizations. For this we have chosen to group in different antennas, bandwidths versus their polarization kind. This study is divided in three distinct parts. First, we have performed a dual-band antenna with linear polarization for covering both Bluetooth and WLAN bands (wireless technologies). Then, we have performed two dual-band antennas with circular polarization. A first one, covering the two GPS (Global Positioning System) bands L1 and L2 and another one working simultaneously in GPS and SDARS (Satellite Digital Audio Radio service) standards. Finally, we have combined linear polarization antenna with one of the circular polarization antennas. Thus, we have carried out five separated antennas working in several various bandwidths
ANALYSE DE RESEAUX D'ANTENNES IMPRIMEES MONOCOUCHES OU MULTICOUCHES. APPLICATION AUX STRUCTURES A FORT COUPLAGE ENTRE ELEMENTS by Robert Staraj( Book )

2 editions published in 1992 in French and held by 2 WorldCat member libraries worldwide

CE TRAVAIL CONCERNE L'ANALYSE DE RESEAUX D'ANTENNES IMPRIMEES MONOCOUCHES ET MULTICOUCHES ALIMENTEES PAR COAXIAL, AINSI QUE L'INFLUENCE DU COUPLAGE DANS CES STRUCTURES. ON RAPPELLE TOUT D'ABORD LA METHODE CLASSIQUE D'ETUDE, QUI UTILISE SIMPLEMENT LE THEOREME DE SUPERPOSITION ET QUI NE TIENT PAS COMPTE DES COUPLAGES. PLUSIEURS METHODES D'ANALYSE DE RESEAUX, BASEES SUR LA RESOLUTION D'EQUATIONS INTEGRALES DANS LE DOMAINE SPECTRAL, SONT ENSUITE DEVELOPPEES. LA PREMIERE CONCERNE LES RESEAUX BIPERIODIQUES INFINIS. CETTE APPROCHE PARTICULIERE PERMET D'UNE PART UNE SIMPLIFICATION DES EQUATIONS INTEGRALES QUI DEVIENNENT DES SOMMES DISCRETES, ET APPROXIME ASSEZ BIEN LES RESEAUX COMPORTANT UN GRAND NOMBRE D'ELEMENTS. LES ELEMENTS DES RESEAUX ETUDIES SONT DE FORMES RECTANGULAIRES ET TRIANGULAIRES. AFIN DE S'AFFRANCHIR DE LA DIFFICULTE DE REALISATION D'UN TEL RESEAU PHASE, ON A ENSUITE ETENDU L'ANALYSE THEORIQUE AU CAS D'UN SEUL ELEMENT ALIMENTE LORSQUE LES AUTRES SONT CHARGES PAR DES IMPEDANCES. A PARTIR DE CES RESULTATS, UNE ETUDE PARAMETRIQUE MONTRE L'INFLUENCE DES DIVERSES COMPOSANTES DU RESEAU, NOTAMMENT SUR L'IMPEDANCE D'ENTREE, LA BANDE PASSANTE, AINSI QUE SUR LE CHAMP RAYONNE. DIFFERENTES STRUCTURES A ELEMENTS DECALES, A ELEMENTS PARASITES OU EN DAMIER SONT AUSSI PROPOSEES, AFIN D'AMELIORER CERTAINES CARACTERISTIQUES. LA SECONDE METHODE PERMET DE TRAITER DES RESEAUX MONOCOUCHES OU MULTICOUCHES LIMITES, COMPOSES D'ELEMENTS RECTANGULAIRES DISPOSES DE FACON QUELCONQUE. LA POSSIBILITE DE N'ALIMENTER QU'UN SEUL ELEMENT A AUSSI ETE ENVISAGEE THEORIQUEMENT. CES DIFFERENTES MODELISATIONS SONT ENSUITE COMPAREES AVEC QUELQUES REALISATIONS PRATIQUES. UN BON ACCORD THEORIE EXPERIENCE EST OBSERVE SELON LES CAS DE STRUCTURES ET L'APPROCHE EMPLOYEE
Développement d'étiquettes RFID UHF pour la traçabilité et le contrôle de qualité des produits alimentaires, Application : production de fromage by Abanob Abdelnour( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

In the food sector, the use of RFID makes it possible to improve the safety of food while ensuring better traceability and better monitoring of products. The work of the thesis was mainly carried out within the framework of a project in cooperation with several academic and industrial partners in the cheese sector where the main objective of the project is to develop UHF RFID tags adapted to the constraints of food products by ensuring a dual function: a traceability function with unitary identification, and then a sensing function of cheese maturation by indirect measurement of its electromagnetic and physicochemical properties.The first step of the project was the characterization of the electromagnetic parameters of food products during ripening in order to achieve an appropriate design of the tag antenna. Knowledge of these properties is essential to meet industrial requirements and to integrate systems in right conditions. Also, a correlation study is carried out between the variation of the dielectric properties and that of the chemical properties during the period of cheese ripening. This study helps to understand the difference between cheese types and allows determining the main parameters to follow during cheese maturation for the design of the sensor tag.The second step was the design of identification tags for the traceability of food products during the manufacturing process. The primary objective is to create a UHF RFID tag with a performance that meets the needs of manufacturers in the cheese sector regarding the size, memory and reading distance while respecting the health standards at the packaging level as well as the substrate used. Several UHF RFID tag configurations were realized and tested in an industrial environment where the results obtained show the effectiveness of using an RFID system to automate the traceability of products in the cheese sector.The third step is the design of sensor tags to track the degree of maturation of products during the ripening period. A first solution, based on the exploitation of the effect of variation of the dielectric properties on the tag reading distance, shows a lack of performance due to the small variations as well as the difficulties of measurement in a real environment. A second solution based on the analysis of gas evolution rate shows the possibility of estimating the degree of cheese maturation. However, the sensor activation power and the high cost represent significant challenges and thus it was difficult to adopt this solution. Finally, two alternative solutions to measure the effect of gas evolution were presented. The idea is based on monitoring other parameters varying due to the increase of gas release during cheese maturation. The first sensor tag configuration traces the variation of product dimension due to maturation using a resistive sensor. On the other hand, the second sensor tag configuration measures the change of pressure inside the product packaging due to gas production. The results obtained show that these two sensor RFID tag configurations can offer simple and practical solutions for controlling the cheese ripening process
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
Conception d'antennes miniatures intégrées pour solutions RF SiP by Mickaël Jeangeorges( Book )

2 editions published in 2010 in French and held by 2 WorldCat member libraries worldwide

This thesis presents the design and optimization of miniature antennas integrated in RF System in Package modules. The goal is to meet the growing need for complete integrated modules, including alls components needed to provide wireless functionality to electronic devices. In order to achieve this objective, the antennas must meet several criteria in terms of performance (matching, bandwidth, efficiency, radiation pattern) and design methods (robustness, cost, SiP manufacturing process, industrial production). The extreme miniaturization makes it more difficult because it leads to physical phenomena limiting the performance. Our research is investigating the possibility of using some techniques to improve the antenna with the addition of structural elements (capacitive feed, parasitic arms, slots) and the use of specific matching circuits. Various geometrical innovative modifications applied to antenna structures have also been used to obtain results satisfying all criteria. The designed antennas allow communicating objects of various sizes to operate in the 2,4 GHz band for applications such as WiFi or Bluetooth. Several runs of prototypes have validated the results and confirm the electromagnetic phenomena observed
Développement de capteurs RFID passifs dédiés au monitoring des groupes alternateurs by Konstantinos Zannas( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Dans le contexte de l'Internet des Objets et l'Industrie 4.0, de nouvelles technologies sont attendues pour apporter des solutions à plusieurs problèmes industriels. La technologie RFID, et son évolution vers les capteurs, est très prometteuse et pourrait potentiellement trouver des applications en environnement industriel. Le travail développé dans cette thèse s'est réalisé dans le cadre du projet Innov'Hydro, en partenariat avec plusieurs acteurs académiques et industriels. Ce projet visait principalement à explorer de nouvelles solutions de capteurs destinés aux environnements sévères des centrales hydroélectriques, en particulier l'intérieur des génératrices. En effet, les générateurs encombrants des centrales sont susceptibles de tomber en panne en raison de l'oxydation de pièces internes à cause des courants électriques forts. Une solution pour éviter de telles pannes consiste à surveiller la température et/ou la déformation à l'intérieur des générateurs et en particulier les parties vulnérables. Afin de surveiller ces pièces, la taille réduite, la grande précision et le fonctionnement passif sont des facteurs critiques de toute solution de détection. Toutes ces caractéristiques peuvent être satisfaites par la technologie RFID UHF et la transformation récente des tags en tag-capteur RFID. Ainsi l'utilisation de nouvelles configurations et concepts de tag-capteurs, la mesure de la température et du stress dans un environnement réel de centrale hydroélectrique sont explorés en profondeur. Des résultats prometteurs sont obtenus grâce à un ensemble de mesures et de tests à la fois en laboratoire et en environnement réel
Diversity Characterization of Optimized Two-Antenna Systems for UMTS Handsets by Aly Diallo( )

1 edition published in 2007 in English and held by 2 WorldCat member libraries worldwide

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
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
 
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Associated Subjects
Non-standard antennas
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Alternative Names
Staraj, R.

Languages
French (23)

English (14)