Abstract
This paper proposes a low-profile metasurface (MS) lens antenna with flat-top radiation pattern. Specifically, a low-profile slot array fed by the pillbox system serves as the feeding source while an MS lens placed close to the slot array can further shape the beam to flat-top radiation pattern. Compared with the conventional MS lens antennas with a single feeding source, the overall profile is greatly reduced and the fabrication stability is improved. Theoretical analyses, simulations, and measurements are carried out in this study. The proposed MS lens antenna operates at a central frequency of 28.5 GHz, aiming at supporting 5G millimeter-wave (mmW) communications. The measured results agree well with the analyzed and simulated ones. The proposed MS antenna realizes the flat-top pattern of over ± 20° with the measured peak gain of 10.5 dBi. The overall size is 78 mm × 63 mm × 4.4 mm, corresponding to 7.4λ0 × 6λ0 × 0.42λ0 at 28.5 GHz (λ0 is the free-space wavelength).
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