Antenna beam steering using phase gradient metasurface radome

Phase gradient metasurfaces (PGMs) are the two-dimensional metamaterial. It can manipulate the propagation direction, wave front and polarization of the reflected/transmitted waves with more freedom. In this paper, the phase gradient metasurfaces are used as the radomes to manipulate the direction of the main lobe or to improve the directivity of the patch antenna. Based on the transmissive polarization conversion metasurface (PCM), two PGM radomes are achieved. One can alter the main lobe direction of the patch antenna, and the other one can highly improve the directivity and gain of the patch antenna. The simulated directional diagrams and gain of the patch antennas with and without the PGM radomes indicate that the covered PGM radomes have good performance on antenna main lobe direction manipulation and antenna directivity and gain improvement.