Metasurface enabling control of electromagnetic wave propagation in spatial and spectral domains has been receiving substantial attention for next generation wireless and radar applications in which millimeter-wave frequencies have been considered as dominant candidate frequencies. Millimeter-wave metasurface can achieve fundamentally enhanced gain and scannable coverage by employing electrically large-aperture. However, there has been a lack of analytic and heuristic studies on fundamental limits and trade-offs among key performance parameters such as aperture efficiency, scannable coverage, focal length and so on. Furthermore, affordable design methodologies of millimeter-wave configuration toward commercialization and realizable phased array architectures combined with metasurface haven’t been proposed while most of the studies have been biased toward proof of concept (POC)-level of new functionality such as beam transformation and polarization conversion.     

     In this talk, I will first present new design approaches based on synthesis of mixed-order and disparate spatial filter responses enabling thinner and simpler configurations. Next, I will introduce various macro and tiny designs of this-type metasurface and new phased array architectures combined with them to achieve wide-coverage beam steering as well as gain enhancement for 5G mobile communications. Lastly, a new class of millimeter-wave metasurface providing frequency diverse and multi-mode beam shaping will be proposed for miniaturized radar sensors.