Holographic Inspire Reflectarray for Orbital Angular Momentum Multiplexing Using Optimization Based on Support Vector Regression

This work introduces a design methodology for reflectarrays based on holographic theory to generate multiple Orbital Angular Momentum (OAM) modes at the same operating frequency, enabling OAM multiplexing. This methodology directly provides the element geometry for dual-polarized multi-feed configurations. To do so, the holographic theory is combined with Support Vector Regression (SVR) models of the unit cell to fully characterize the element response. A numerical example of a reflectarray fed by two feeders to generate four OAM modes is presented, reaching a high degree of purity in each of them.