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Rozprawy doktorskie na temat "Antenne multibande et large bande"
Benomar, Ahmed. "Etude des Antennes à Résonateurs Diélectriques. : Application aux Réseaux de Télécommunications". Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0025/document.
Pełny tekst źródłaA fast technological development in the telecommunications domain, as mobile telephony, wireless networks, TV over Satellite, Radar Applications (civil or military)…etc, is observed. This considerable growth has led to enormous needs and caused a major technological evolution in antennas. These have to face different needs such as gain improvement, bandwidth enlargement, and different existing problems, such as cost and overcrowding…etc. Though, our goal is to design antenna topologies that are simple, having Low overcrowding and relatively with high gain operating in multiband and/or ultra large. To achieve this we headed to Dielectric Resonator Antennas (DRA) in UHF and SHF bands. Recently they have been the subject of several studies and have gained great interest from both academic and industrial sectors. Due to their diverse and simple geometries, they can be fed with different usual techniques. Furthermore, they can be smaller than patch antennas. The first part of this work has focused on the study of cylindrical DRAs, and then a validation of the simulating tool has been done after comparison with measurement results. For a multi-standard utilization, enlargement antennas’ operating bands, to have bi-band behaviour, get a modification of the resonant frequency and also a reduction of the overcrowding, the second part is dedicated to the study of new resonator topologies based on a vertical and radial stack of two cylinders, and then a multilayer and ring topologies. The obtained results found their applications in GSM900-DCS1800-UMTS-WiFi…
Mello, Rafael Gonçalves Licursi de. "Active and passive metasurfaces : methodology for the design of a low profile, beam-steerable, multiband, and wideband antenna". Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAT025.
Pełny tekst źródłaMetasurfaces are artificial engineered materials that can be combined with traditional microwave components in ground-breaking solutions. The research on the use of metasurfaces in the roles of antenna reflector and/or superstrate considerably increased mainly from the beginning of the 2020s, because of their innovative functionalities in line with the ultimate Telecommunication trends. In this thesis, methodologies for the use of passive and active metasurfaces in the design of antennas are presented. A first methodology which exploits both the near-perfect electric conductor (PEC) and near-perfect magnetic conductor (PMC) behaviors of a dual-band artificial magnetic conductor (AMC) is used to design a low-profile, multiband, directive antenna. This methodology is validated with a prototype suitable for the European standards of 4G/5G and Wi-Fi 2.4/5/6E, operating within the following bands: 2.40–2.70 GHz, 3.40–3.80 GHz, 5.17–5.83 GHz, and 5.93–6.45 GHz. Additionally, a methodology to handle the Fabry-Pérot mechanism in an antenna composed of a grooved rounded-edge bow-tie, a passive dual-band AMC, and an active multiband Huygens metasurface is presented. This methodology is validated with the design of a multiband, directive, low-profile, antenna that performs an independent beam-steering in only one of the operating frequency bands. Through the controlling of the bias voltages over four columns of varactors in the reconfigurable, multiband Huygens metasurface, the beam may be dynamically steered in ±51°, in a continuous manner, in a frequency range lying inside the European 5G frequency range (from 3.50 to 3.65 GHz. All at once, the radiation patterns concerning the 4G and Wi-Fi 2.4/5/6E keep practically unaffected
Jebbawi, Khodor. "Etude et réalisation d'un système embarqué UHF appliqué à la récupération de statistiques chez le sportif amateur". Electronic Thesis or Diss., Aix-Marseille, 2020. http://theses.univ-amu.fr.lama.univ-amu.fr/200917_JEBBAWI_711xpp867owr742fklcav366xhj_TH.pdf.
Pełny tekst źródłaThis thesis was funded by the ANRT. The main goal is to design a specific antennas for connected objects. The final application is dedicated for the sport, in order to collect the performance of an amateur football player by using a connected ball and a connected strap. This device is based on the passive RFID. The system is composite of: a wearable antenna placed on the ankle, able to communicate with RFID tags inserted inside the ball. At the end of the match, the statistics collected by the sensors are sent by using BLE connection to a totem in order to display them. Two main objectives are targeted in this thesis: the first one is designing a broadband and multistandard antennas for readers, able to minimize the influence of the human body without sacrificing reading distance, the second objective is designing a resistant antennas for RFID tags
Moustafa, Lina. "Conception d'antennes à Bande Interdite Electromagnétique large bande et multibandes à base de métasurfaces". Limoges, 2009. https://aurore.unilim.fr/theses/nxfile/default/0b6d599a-f2a9-4deb-b823-5dba8a5d5130/blobholder:0/2009LIMO4027.pdf.
Pełny tekst źródłaThis PhD thesis is dedicated to the study of Electromagnetic Band Gap antennas based on metasurfaces. Metasurfaces are employed in the antenna design to correct the usual limitations of the technology and more precisely to enlarge the banwidth. The possibilities offered by combining partially reflecting surfaces, with respect to structure height are explored. Multi-band and broadband EBG antennas with structured interface are designed. An experimental validation of the wideband antenna concept based on metasurfaces is realized. Finally, it is demonstrated that the product gain-bandwidth of such an antenna can be further improved by the use of a multiple feeding sources system
Letestu, Yoann. "Etude des antennes hélices quadrifilaires imprimées larges bandes et multibandes - Application en bande Ku. ; Contribution à l'étude générale du couplage mutuel". Rennes 1, 2004. http://www.theses.fr/2004REN10163.
Pełny tekst źródłaHuitema, Laure. "Conception d’antennes miniatures à base de matériaux innovants pour systèmes de communications mobiles". Limoges, 2011. https://aurore.unilim.fr/theses/nxfile/default/a25b0fa1-3acc-4afb-ad61-8ca9e1c81d3f/blobholder:0/2011LIMO4031.pdf.
Pełny tekst źródłaGiven the desire to integrate a large number of new services in last generation of mobile handheld devices and in order to drastically decrease their dimensions, new concepts of smart antennas are being considered. The main objective is to offer new services in a trendy mobile handheld with an optimal quality and an improved link budget. The antenna has to be small and in order to improve the reliability of wireless links, the antenna structure must have a frequency tunability, a reconfigurable polarization or radiation pattern. In order to satisfy these objectives, this manuscript focuses on two axes. At first, it is necessary to unlock the constraints on the miniaturization of such antennas to multiple services by studying the potentialities and effectiveness of original materials dedicated to the compliance and optimization of the antenna performances within its environment. Thanks to this study, it is then possible to investigate new concepts of reconfigurable antennas to optimize their performances within their environment. This manuscript is proposing answers to these challenges by detailing the development, the conception and the manufacturing of four different miniature and reconfigurable antenna designs using new kind of materials
Oudin, Marc. "Etude d'algorithmes de traitement d'antenne sur signaux large bande et signaux radar bande étroite à antenne tournante". Paris 6, 2008. http://www.theses.fr/2008PA066209.
Pełny tekst źródłaLardies, Joseph. "Etude d'antennes acoustiques a directivite constante sur une large bande". Toulouse 3, 1987. http://www.theses.fr/1987TOU30214.
Pełny tekst źródłaZemmour, Hamadache. "Réseaux de capteurs sans fil enfouis ultra large bande : antenne et liens radios". Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1076/document.
Pełny tekst źródłaWireless underground sensor networks (WUSN) consist of sensors which are buried in a medium with their antennas, in particular in soil. They attract a huge interest in different fields, like environment monitoring, precise agriculture, navigation and security. The existing narrowband systems operate at frequencies below 1 GHz. These systems imply the use of cumbersome antennas, which complicates the deployment and increases its cost. Furthermore, the use of narrow bandwidths limits the possible communication data rates and the potential resolution in localization applications. Finally, current systems are very energy consuming, which limits the lifetime of the underground elements.To overcome these drawbacks for certain applications of WUSN, we propose in this thesis the use of ultra wideband technology (UWB), in the normalized band 3.1 - 10.6 GHz, in WUSN. This technique allows the use of compact antennas, simplifying deployment, improving the localization accuracy and increasing communication data rates and the lifetime of the underground sensors.In order to assess the feasibility study of UWB WUSN, we have designed and realized three compact UWB antennas and analyzed the effect of soil on the performances of these underground UWB antennas and on the underground UWB communication links. Compared with operating in free space, burying the antenna shifts the antenna bandwidth towards low frequencies. This shift increases with soil water content. The attenuation introduced by the buried UWB channel, increases with the operating frequency, the burial depth and the soil moisture. However, we have shown that reliable communications are possible for distances of propagation in soil smaller than 30 cm and soil water contents below 20%
Decroze, Cyril Nicolas. "Etude et optimisation d'un nouveau type d'antenne coplanaire : Application à des liaisons de proximité et utilisation pour des dispositifs multifonctions et large bande". Limoges, 2002. http://www.theses.fr/2002LIMO0032.
Pełny tekst źródłaThis report presents the study of a new type of coplanar antenna : "the coplanar wire patch antenna". The uniplanar topology of this radiating element, as well as its low frequency working mode, makes it a very compact structure which allows to answer the current needs of compact antennas for the modern telecommunications. Various developments based on this original concept are proposed, to expand the intrinsic performances of the antenna towards wide band and multifunction radiating devices. On the other hand, the coplanar wire-patch antenna is used to be directly integrated into a communication module dedicated to wireless metering of energy resources. This work also presents the technological solutions considered to directly print the aerial on the case of the communication module, as well as the size constraints which the integrated antenna should answer in this particular context