Scattering control and camouflage through metasurfaces

In the last years, there has been a strong interest in the design of invisibility devices able to reduce significantly the scattering of an object in a desired frequencies range. In particular, mantle cloaking has proven that electromagnetic invisibility can be achieved using patterned surfaces, also known as metasurfaces. The aim of this contribution is to show that metasurfaces can be used also for camouflaging purposes, i.e., for designing devices able to make an object appearing as it were either larger or thinner or composed by a different material. As an example, we present the analytical formulation and the numerical results of a cylindrical object made of an electric conductor whose scattering is made equal to the one of a dielectric cylinder. Finally, the bandwidth limitations of this technique, as well as a potential solution to improve the frequency response of the camouflaging devices, are discussed.