Figure 4
From: Simultaneous realization of slow and fast acoustic waves using a fractal structure of Koch curve
Transmissions and acoustic fields in the QKCM. (a) and (c) The theoretical transmissions calculated with Eq. (3) based on different attenuation coefficients in which \({\alpha }_{0}=2.78\times {10}^{-5}\sqrt{f}/0.5d\) and the distributions of (b) SPL at 275 Hz and (d) acoustic pressure at 420 Hz simulated with COMSOL software.
