Metasurface in microwave region: Theory and applications

In this paper, recent works of metasurface in microwave region are reviewed. First, ultra-thin metasurface based on phase discontinuity is introduced. Different spatial phase functions are adopted to achieve manipulation of wavefront, including bi-polarization metalens and orbital angular momentum. Second, metasurface based on transformation optics is studied. A four-beam antenna is constructed based on metasurfaces, which is verified by experimental results. Our designs provide a promising approach to miniaturize, planarize and integrate multiple microwave components.