Analysis of resonant wireless power transfer systems with magnetic metasurface lenses

• Ano de defesa: 2020
• Autor(a) principal: Soares, Ícaro Veloso
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Centro Federal de Educação Tecnológica de Minas Gerais / Universidade Federal de São João del-Rei; Programa de Pós-Graduação em Engenharia Elétrica; Brasil; CEFET-MG / UFSJ
• Palavras-chave em Português: Campos elétricos; Equações – Soluções numéricas; Linhas de transmissão de micro-ondas; Metamateriais; Dispositivos eletromagnéticos
• Link de acesso: https://repositorio.cefetmg.br//handle/123456789/1592

From the various existing techniques to wirelessly transfer energy, one of the most efficient in terms of power and distance range is through magnetic resonance. In this technique, the transmitter and receiver coils are inductively coupled, and this coupling is intensified when both coils are tuned at the same resonant frequency. One way to enhance the power transfer efficiency and also to control the magnetic field direction is by applying metamaterial lenses which are able to overcome the diffraction limit. In this engineered material, the effective electromagnetic properties are functions of the chemical composition and geometrical arrangement of the unit cells that compose it. The analysis of a resonant wireless power transfer with metamaterial lenses is a complex and computationally costly problem. Therefore, in this work, an alternative approach for the qualitative analysis of these structures is proposed by applying the thin-wire approximation and its numerical solution through the Method of Moments. In addition, the Transformation Optics technique is applied to determine the refractive index profile of a metamaterial lens that leads to a desired magnetic field collimation. In this way, different magnetic metasurface lenses are designed, and their behaviour is computationally and experimentally verified. Finally, two-coil and four-coil resonant wireless power transfer systems are designed, built and tested with and without the inclusion of metamaterials lenses.