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This paper proposes a novel phenomenon of broadband self-cloaking inside ducts using liners. In the audible range the plane waves inside duct is guided around an object with the help of liner surface modes. One dimensional modelling of this phenomenon is done using Mild-slope formulation. This explanation is inspired from the domain of water waves. This analytical method is comparatively simpler in application and the results agree well with solution of Helmholtz equation.
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