Fig. 2.

Study of a bianisotropic acoustic cell. a Geometry of a cell with four side-loaded resonator. The height of the Helmholtz resonators is varied to create different bianisotropic responses. Definition of the forward (+) and backward (−) illuminations. b Amplitude and phase of the transmission and reflection coefficients of an arbitrary cell. The dimensions of the cell are: w = 12 mm, h₂ = 1.5 mm, w₂ = 1 mm, h₁ = 1 mm, w₁ = 4 mm, w_a = 6 mm, w_b = 5 mm, w_c = 4 mm, and w_d = 3 mm