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Based on the effective medium approximation, we propose a practical implementation of cylindrical acoustic cloak with concentric alternating multilayered structure of homogeneous isotropic materials, which can perfectly mimic the ideal radius-dependent and anisotropic ordinary lens cloak. The proposal exhibits near-ideal cloaking performance such as low-scattering and shadow-reducing at a wide range frequency, thus can hide an object from the detection of acoustic wave. The acoustic waves can pass through the cloaking shell with unchanged wavefront shape, which endues the cloaked object with duplex communication ability. More simulations on the acoustic far-field scattering patterns and total scattering cross-section (TSCS) are performed to investigate the layer number and frequency dependence of cloaking effect, and the results show that the thinner layers exhibit better cloaking effect. The proposal may significantly facilitate the experimental demonstration of acoustic cloak.

acoustic cloak; acoustic metamaterials; effective medium