Rapport d'avancement de thèse. TLM Modeling for propagation in underground railway tunnels for antenna positioning
CASTIBLANCO
Type de document
RAPPORT
Langue
anglais
Auteur
CASTIBLANCO
Résumé / Abstract
Equipping railway vehicles with wireless communication systems is getting more and more complicated. Indeed, the number of onboard wireless systems is growing and polymers are increasingly used to build modern, lighter railway vehicles. Antenna integration on such platforms is becoming a real challenge. Recent research results in the field of wave-matter interaction and antenna technology suggest the use design of antennas accounting for the electromagnetic (EM) characteristics of the surrounding environment by using metamaterials. Metamaterials are artificial EM structures having unusual properties. They can provide a higher degree of freedom in the design of antennas for wireless systems while controlling the EM energy stored or radiated around the antenna. The aim of this PhD is to address the problem of antenna design and integration in the railway environment through the development of an appropriate methodology to account for the EM constraints of this specific environment from the design level of wireless systems. The methodology can be divided into four steps. The first will consist in choosing the appropriate antenna topology, considering the objects, the type of material in which they are made and the other elements of relevance in the environment. The second will deal with the near-field distributions and the evaluation of the potential benefits that could be offer the metamaterial based antennas to further their radiation and coupling properties in these environments. Due to the complexity and the size of the objects in these environments, it will be considered in the third step the antenna electromagnetic modelling through the use of numerical methods and the possible hybridization of a few of them. Finally, in the fourth and final phase, the characterization of the antenna proposed will be studied from the point of view of the electromagnetic compatibility (EMC).
