Inhomogeneous metasurface to enlarge cloaking bandwidth

The main issues of cloaking problems are to increase the bandwidth of operation and to efficiently cloak electrically large objects. In order to overcome these problems, in this paper an inhomogeneous metasurface is proposed. The metasurface unit cell is composed of two metallic square patches with different lengths. Two arrangements of the single patches are analysed in terms of scattering field reduction and compared with a homogeneous structure.