Title: Terahertz metasurface technologies for 6G RIS and cloaking applications
Atsushi Sanada
Graduate School of Engineering Science, Osaka University
Abstract: Metasurface technologies aiming at reconfigurable intelligent surface (RIS) and cloaking device for 6G applications at terahertz frequency regions are presented. First, RIS metasurfaces with dynamic anomalous reflection beam steering and beam shaping functionalities are presented with numerical and experimental demonstrations at 140 and 300 GHz regions. The RIS metasurfaces are based on elastic polymer substrate and designed to perfectly suppress unwanted specular and spurious reflections, which leads to perfect anomalous reflection. The RIS can be an ultra-low lost and realistic solution for mitigating coverage hole in 6G wireless communications. In addition, the cloaking technology which suppress reflected and refracted waves caused by a metallic cylinder are presented. Active and passive cloaking metasurfaces are designed with distributed surface immittance at 140 GHz and their cloaking performances are demonstrated. The cloaking metasurfaces are advantageous in high scattering suppression performance and in larger scale scatter capability compared with those of conventional mantle cloaks based on periodic structure.
