High Gain Antenna Based on Single-Layer High-Efficiency Transmitting Phase-Gradient Metasurface

In this paper, based on rotation phase-gradient principle, a single-layer, high-efficiency transmitting metasurface is designed and applied to high-gain antenna. The transmitting wave emerges an anomalous refraction when left-handed circularly polarized wave are incident perpendicularly to the one-dimensional phase-gradient metasurface, which is composed of cycle arrangement of 6 units with step value of 30°. The two-dimensional focused metasurface is designed to enhance the antenna performance while the left-handed circularly polarized antenna is placed at the focus. The simulated max gain is increased by 12dB (182%) and the half-power beamwidth is reduced by 74.6 °. The measured results are coincided with the simulations, which indicates the antenna has high directivity. The designed single-layer transmission metasurface has advantages of thin thickness (only 1.5 mm), high efficiency and light weight, and will have important application prospects in polarization conversion and beam control.