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Conception de petits réseaux d'antennes reconfigurables ou "Small Cells" pour le standard 5G

Abstract : Consumer mobile communications, video downloads and the use of mobile applications represent most of today's use of radio resources in 4G networks; but in order to broaden the spectrum of uses and the diversity of users, many research efforts and numerous proposals are beginning to emerge for the implementation of a new standard called 5G, which targets a wide range of sectors and is important pillars of a society: energy, health, media, industry or transportation. To fulfil these challenges, this new standard will have to combine several technologies, including the creation of an Ultra-Dense Network (UDN) to obtain a dense coverage, more robust to obstacles and increase the capacity of the network. This promising solution is obtained by the deployment of dense small cells in hotspots where huge traffic is generated, and by using millimeter waves to extend the transmission bandwidth.These smalls cells must optimize the received signal according to the location of the user, by using a high gain beam reconfigurable antennas array. This method avoids using all the available power to issue "blind" hoping to fall on the terminal.The Objectives of this thesis is therefore to design a small antennas array or "Small Cells" working in mmWave bands with an ability to change the direction of the beam according to the needs of users. A dual polarized beam reconfigurable technique applied on a planar antenna array has been developed.This manuscript is divided as follows: after a reminder of the objectives of the 5G and its requirements in chapter 1, we have introduced in chapter 2, the architectures and theory of the different antenna arrays, as well as the different techniques of beam steer. The third chapter is dedicated to the design of a cross patch antenna with a dual polarization and reconfigurable beam by using switchable parasitic elements. This radiating element was then used in Chapter 4 to design a high-gain reconfigurable, multiport sub-arrays and antenna arrays.
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Assane Ngom. Conception de petits réseaux d'antennes reconfigurables ou "Small Cells" pour le standard 5G. Electronique. Université Côte d'Azur; Université Cheikh Anta Diop de Dakar, 2019. Français. ⟨NNT : 2019AZUR4027⟩. ⟨tel-02492090⟩

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