Manipulating electromagnetic radiation through metamaterial structures designed by coordinate transformation

In this presentation, we will demonstrate some examples of applying the transformation optics to the manipulation of electromagnetic radiations from antenna or antenna array. By designing through different kinds of coordinate transformations, the radiation direction of an omni-directional antenna could be modulated through a metamaterial cylindrical shell, and conformal antenna array located on an arbitrary curved surface could be modulated to a planar array by covering with properly designed metamaterial structure. The validity of the proposed wave manipulations have been verified through two dimensional full-wave numerical simulations based on the finite element method. The electromagnetic wave manipulation through metamaterials provides alternative ways to steer electromagnetic irradiation and may find novel applications in microwave antenna technology.