High Gain Beamsteerable Metasurface Lens Antenna for Millimeter-Wave Applications

Abstract

A compact high gain phase-gradient metasurface lens (MSL) antenna with end loaded cross dipole slot as unit cell is proposed for millimeter-wave beamsteering applications. The proposed unit cell is transmission-type and is insensitive to polarization and oblique angle of incidence. A MSL is designed using 25 × 25 array of unit cells having an overall size of 7 λ0 × 7 λ0 × 0.23 λ0. The steered beams at 0°, ±15°, and ±30° is achieved by exciting the MSL using three different feed sources at an offset of 0 mm, ±7.5 mm and ±15 mm from the center along ± x-axis. The feed source is kept at 20 mm focal distance beneath the designed MSL having a f/D ratio of 0.27. Full 3-dB spatial beam coverage of 60° (± 30°) is achieved with a gain tolerance of 1 dB and a maximum gain of 18.4 dBi in the broadside direction showing a gain enhancement of 11.9 dB. © 2022 IEEE.