A fan-shaped multibeam antenna based on metasurface (MS) lens is first proposed and validated in this letter. It features stable radiation gain and high beam-crossover levels that are attractive in high-quality beam-scanning applications. A simple multi-port pillbox antenna is employed as the source antenna, while an MS lens is placed above it with an air gap for beamforming. The proposed MS antenna targeting 5G millimeter-wave band has a −10-dB impedance bandwidth from 26.9 to 29.9 GHz. It can generate 5 beams with a scanning range of ±30°. Remarkably, the beam-crossover levels are higher than −1.9 dB at the central frequency. The gain variation for each beam is within 1 dB for a 12° coverage range and 3.5 dB for the whole ±30° angle coverage range. Compared with previous reports, the proposed MS antenna shows great advantages in terms of electric performance and physical properties.
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Yin et al. (2024) studied this question.
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