Beam Steering Realization using a Reflective Metasurface for THz Applications

This paper presents a reflective metasurface designed for beam steering at 300 GHz. The metasurface uses an H-shaped structure as its unit cell to achieve desired reflection phases. A supercell, consisting of 16 unit cells, covers a complete reflection phase range of 360 degrees. To achieve a radiation pattern with the main beam directed at 30 degrees from the broadside direction, 28 supercells are fabricated on a grounded GaAs substrate of dimensions 4.4 mm × 4.4 mm. Full-wave simulations are conducted, demonstrating that the proposed metasurface achieves an overall gain of 10 dBi under a horn excitation. In addition, the radiation and transmission performance of the proposed metasurface over a long distance in a complex environment with multipath effects is proven to be effective. These results suggest that such metasurfaces have significant potential in THz applications.