Design of a compact monopole-based large Dynamic Scattering Array at 28 GHz for future 6G networks

This thesis focuses on the practical implementation of a 127 element Dynamic Scattering Array operating at 28 GHz, for 6G applications. Starting from an ideal reference model, the work presents the main limitations of creating a physically realizable structure. A first design considers planar monopoles, showing that the planar layout is strongly affected by ground plane radiation and become difficult to scale. To solve this, a final architecture based on hexahedral monopoles embedded in a dielectric overlay above a circular ground plane is proposed, providing improved azimuthal omnidirectionality and a compact implementation with monopoles realized as via-holes in the dielectric. The array is modeled as a multiport system, and tunable reactive loads are introduced to enable pattern reconfiguration. A varactor based reactive load is then designed to achieve a reactance range compatible with beam synthesis. Finally, the beamforming capability of the array is validated, confirming the feasibility of Dynamic Scattering Array working at 28 GHz.