▎ 摘　　要

In this study, a novel method is proposed to control and reduce the side-lobe level (SLL) of the pyramidal horn antennas. In this method, graphene sheets are deposited on the antenna walls to taper the aperture field leading to pattern engineering with the goal of the SLL reduction. In essence, graphene sheet acts as a high-impedance surface and hinders electromagnetic power from reaching to the horn antenna aperture edges, in such a way that the diffraction phenomenon could be drastically diminished. The proposed design is numerically analysed and optimised using full-wave three-dimensional simulation methods. Numerical full-wave results illustrate more than 17.6 dB reduction in the SLL of the proposed antenna.