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An acoustic cloak with concentric alternating layered structure is designed with homogeneous isotropic materials on the basis of effective medium theory. The cloak possesses low-reflection and power-flow bending properties for different shapes of wavefront both in far- and near-fields, which could perfectly approximate the ideal cloak with inhomogeneous and anisotropic distribution of material parameters.
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Cheng et al. (2008) studied this question.
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