Abstract
In this paper, the design process of a bianisotropic metasurface for acquiring a highly directive beam is presented. We propose a dihedral corner reflector-excited metasurface antenna through which the aperture of a single-fed reflector is covered by a metasurface such that optimal aperture illumination is accomplished. Fields within the reflector are derived based on the modal technique. The general susceptibility synthesis method is used to design a passive, lossless, and reflectionless metasurface by introducing bianisotropy into it. To achieve the optimal radiation characteristics, a rigorous semianalytical method is proposed and utilized to predict directivity, side-lobe level, and source position. Owing to the thoroughness of our approach, the designed metasurface has a plethora of applications at microwave, terahertz, and optical frequencies, especially for designing highly directive antennas. The semianalytical results are verified using the finite-element method by commercial COMSOL Multiphysics electromagnetic solver.
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