Figure 4 | Scientific Reports

Figure 4

From: Subwavelength acoustic monopole source emission enhancement through dual gratings

Figure 4

(a) Design of a new two-layer enclosure. The structure is the same as that shown in Fig. 1(a) except that the second layer is rotated along the azimuthal direction by 15 degrees with respect to the first layer. (b) The same radiation power spectrum is obtained for both structures shown in Figs 1(a) and 4(a). (c,d) Near-field wave intensity at 5300 Hz (c) and 12300 Hz (d), respectively.

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