Design of electromagnetic cloaks with the same scattering patterns of a reduced perfect electric conducting line or ring.

A design method of electromagnetic (EM) cloaks which can change the scattering pattern of the concealed object to that of a reduced perfect electric conducting (PEC) line or ring (two-dimensional case) is proposed in this paper. It is based on the radial transformation method. The boundary of the concealed space is crushed to an arbitrary line or a ring in the designs, and it is thus called the line-projecting or ring-projecting here. When the line or the ring is shrunk to a point, the EM cloak becomes the normally called invisibility cloak. While in the ring-projecting, none of the constitutive parameters of the EM cloaks is singular, so it may be easier to be realized compared with the singular one. Circular, elliptical and diamond cloaks are designed and simulated as examples. Furthermore, the proposed method is also valid in the design of cloaks with three-dimensional structure.