Compact inverse-designed metallic-dielectric metalens for enhancing directivity of millimeter-wave patch antennas

The paper presents a metalens for a 60 GHz antenna-in-package-patch antenna using a compact dielectric, inverse-designed topology with incorporated metallic boundaries for directivity enhancement. The proposed methodology utilizes the gradient-based optimization algorithm to find the optimized topology. We employ the solid isotropic material penalization (SIMP) and the filter-and-threshold method to achieve a manufacturable design. For a robust design, we included fabrication constraints resulting from the additive manufacturing of the metalens.