Abstract
A 2-D multibeam antenna based on the dimension gradient metasurface is proposed in this paper. The metasurface is composed of four subunits formed by square patches with the dimension gradient in a 5 × 5 pattern. When the dimension gradient of subunits is adjusted, the beam direction in the azimuth plane can be switched in a larger range. Furthermore, by introducing L-shaped slots in the ground plane and two stubs on the feeding lines, the peak gain, sidelobe level and isolation of the antenna can be improved. Meanwhile, the antenna maintains a low profile of 0.06 λ0. The measured results show that the impedance bandwidth of the antenna is 16.5% (5.5–6.49 GHz). Four beams are generated and pointed at (φ0, θ0) = (70°, 23°), (160°, 24°), (250°, 21°), and (340°, 24°). The peak gains of the beams reach 8.54 dBi.
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