Innovative Array Configurations and Multifunctional Metasurfaces for Enhancing Performance of Antennas in Operating Contexts

This dissertation investigates innovative methodologies for electromagnetic field manipulation and antenna performance enhancement through the development of advanced array configurations and multifunctional metasurfaces. These research topics, although well established within the electromagnetic community, remain a dynamic and fertile ground for innovation, as they continue to drive progress toward more efficient, compact, and versatile electromagnetic systems. The work combines theoretical modeling, full-wave simulations, and experimental validation to tackle fundamental and practical challenges associated with the precise control and manipulation of electromagnetic waves across a wide frequency range. The study is structured around two principal Chapters, each addressing a complementary aspect of electromagnetic field control: the design of advanced antenna arrays for enhanced radiation performance, and the engineering of multifunctional metasurfaces for a tailored electromagnetic field interaction.