A Single Metasurface Plate Excited by a Patch Antenna for Large Tilt Angle Formation

An antenna system composed of a single metasurface plate and a feed patch antenna is proposed. First, for inclusions of the metasurface plate, a double L-shaped metaatom is investigated, where the metaatom has inner and outer conducting arms. The change in the inner arm length creates a desired transmission phase for plane wave incidence on it. Next, the metasurface plate is placed above the feed patch antenna. As an example, a tilt beam of 60° is designed. The gain in a fixed direction of
$\theta=60^{\circ}$
is approximately 18 dBi, which is approximately 11 dB higher than the gain of the patch antenna. The 3-dB gain drop bandwidth is approximately 12%. The VSWR at the feed point of the patch antenna is less than two.