External cloak with homogeneous material

According to coordinate transformation theory, a new kind of two-dimensional diamond cloak is proposed and designed which can hide an object within a distance outside the cloak. Compared with traditional cloaks, the object cloaked by using such a diamond cloak is not blinded and can exchange information with the outer region. In addition, the parameters of permittivity and permeability are just homogeneously anisotropic, which could be realized easily in actual applications. Full-wave simulations are given to validate this new cloaking concept.