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The method of coordinate transformation offers a way to realize perfectcloaks, but provides less ability to characterize the performance of amultilayered cloak in practice. Here, we propose an analytical model to predictthe performance of a multilayered cylindrical cloak, based on which, the cloakin practice can be optimized to diminish the intrinsic scatterings caused bydiscretization and simplification. Extremely low scattering or "quasi-perfectinvisibility" can be achieved with only a few layers of anisotropicmetamaterials without following the transformation method. Meanwhile, thepermittivity and permeability parameters of the layers are relatively small,which is a remarkable advantage of our approach.

A route to quasi-perfect invisibility cylindrical cloaks without extreme values in the parameters