Broadband acoustic bend composed of homogeneous curved waveguides in quasi-two-dimensional space

By exploring equivalent acoustic path length between inhomogeneous medium and homogenous curved geometry, we present a broadband acoustic bend composed of homogeneous curved waveguides in quasi-two-dimensional space. Simultaneous control of the wavefront and phase accumulation of acoustic waves is achieved by designing the embedding geometry of homogeneous curved waveguides with subwavelength ports, guaranteeing both the bending effect and extremely high transmission. Unlike metamaterials-based wave bends, homogeneous curved waveguides, filled with background air, exhibit promising broadband properties. Moreover, we propose a broadband acoustic splitter by mirroring the acoustic bend. Simulation results demonstrate functionalities of our designs.