Figure 2
From: Acoustic transmission loss in Hilbert fractal metamaterials
Comparison of the transmission loss between experimental results (black) and FEM (red) for the various Hilbert fractal orders. All the measurements and simulations were made taking into account the cylindrical holder of Fig. 1f. (a) Only the holder (Fig. 1f). (b) Zeroth (Fig. 1a). (c) First (Fig. 1b). (d) Second (Fig. 1c). (e) Third (Fig. 1d). (f) Fourth (Fig. 1e) orders.
