Broadband acoustic cloaks based on the homogenization of layered materials

We present an analysis of acoustic cloaks based on the homogenization of two fluidlike materials, with an emphasis on periodically layered imperfect cloaks, by removing the singularities of the acoustic parameters required for ideal cloaks. The conditions that material layers should satisfy are systematically analyzed and critically discussed according to their feasibility.

Research highlights
► Conditions that mass density must satisfy for acoustic cloaking are analyzed.
► Feasible parameters for allowing acoustic cloaking are studied.
► Cloak will be possible by engineering materials with required parameters.