Figure 7
Far field polar response as a function of the frequency for (a) reference flat plane, (b) N = 11 QRD panel with a total thickness of 3 cm, (c) QRD panel with total thickness of 56 cm and (d) optimized metadiffuser thickness of 3 cm. (e) Normalized diffusion coefficient or the 3 cm QRD (dashed black), 32 cm QRD (dashed-dotted red) and optimized metadiffuser using TMM (blue) integrated in third of octaves. The third octave integration is shown in thick lines according to ISO 17497-2:201243. (f) Corresponding absorption.
