Abstract
Abstract Arbitrary shaped N-sided polygonal electromagnetic concentrators with homogeneous properties are proposed and designed based on coordinate transformation approach. In comparison with the reported concentrators, material parameters of the concentrators developed here are homogeneous and non-negative, which make the devices applicable to practical fabrication. The constitutive parameters equations reported here are effective for concentrators of regular and irregular shape, which provide the flexibility for device design. Furthermore, to remove the anisotropic of material parameters, layered structure concentrator composed of only homogeneous, isotropic materials are presented based on effective medium theory. Space compressing ratio and concentrating efficiency are calculated to quantitatively investigate the efficiency of the proposed device. The feasibility of concentrator design with ordinary isotropic materials instead of metamaterials would dramatically reduce the fabrication difficulties and move the device a step further towards the practical use.
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