An acoustic bending waveguide designed by anisotropic density-near-zero metamaterial

Wang Yang-Yang¹, Ding Er-Liang¹, Liu Xiao-Zhou^{1, 2, †,}, Gong Xiu-Fen¹

(a) Schematic diagram of a 2D acoustic bending waveguide structure. The pressure field distributions with the bending part filled with (b) an ADNZ metamaterial (ρ_r ≈ 0 and ρ_θ = ρ_water) and (c) water.