Preliminary Simulations of Spherical Reflectarrays in Dual Configuration for Satellite Antennas in Ka-Band - Daniel Martinez-de-Rioja , Yolanda Rodriguez-Vaqueiro, Antonio Pino , Eduardo Martinez-de-Rioja, Jose A. Encinar, Manuel Arrebola, Giovanni Toso (19th European Conference On Antennas And Propagation (Eucap 2025), 2025)