Dual-Polar Antenna Sidelobe Reduction Through Metasurfaces

Paper in proceeding, 2024

The paper proposes a method to control the aperture distribution of a horn-array antenna and reduce sidelobe levels by setting up soft and hard surfaces. Due to the metal walls between elements, the array suffers from poor aperture distribution for certain polarization. By appropriately configuring the four walls of the square horn as soft or hard surfaces, the aperture distribution can be modified, resulting in a reduction of 3 dB in the first sidelobe levels of both polarizations under ideal conditions. Finally, employing longitudinal corrugations formed by alternating metal strips and dielectric strips achieves soft surfaces, while transverse corrugations achieve hard surfaces, leading to an average improvement of 2 dB in sidelobe levels.