Broadband 3D Printed Conformal Dielectric Linear-to-Circular Polarization Metasurface Converter

A 3D printed conformal metasurface, based on a novel dielectric unit cell, is proposed for linear-to-circular polarization conversion. The designed dielectric unit cell comprises a cuboid-shaped dielectric block and a thin square dielectric substrate layer for ease of fabrication with 3D printing technology. Meanwhile, the unit cell can achieve linear-to-circular polarization conversion performance from 14.2 GHz to 20.1 GHz with 3-dB axial ratios (ARs) of 34% and good angular stability within 40°. Then, the unit cell is applied to design conformal linear-to-circular polarization dielectric metasurface converters on cylindrical and spherical surfaces, respectively.