Fractal Acoustic Metamaterials with Subwavelength and Broadband Sound Insulation

Figure 4

(a–c) Transmission losses of the fractal acoustic structures with five units, from the first order to third order. (d) Sound pressure field of the first order at 960 Hz. (e) Sound pressure field of the second order at 620 Hz. (f) Sound pressure field of the third order at 380 Hz.

(a)

(b)

(c)

(d)

(e)

(f)