Incident Angle Reconfigurable Metasurface by Mechanically Extending Diffraction Grating Period

To solve the problem of shadow area in wireless network, a metasurface is expected to anomalously reflect the wave from base station to user in non-line-of-sight (NLOS) area. However, the sensitivity between an incident and reflection angles makes more inflexibility for reflector installation. Therefore, the technique to maintain the reflection angle of reflector, as the incident angle changed, is studied by separating supercell of metasurface. From both of simulation and experimental results, the designed 28 GHz metasurface can maintain a constant reflection angle at 45° while the incident angle is varied up to 0° - 10° without re-designing process.