Figure 6 | Scientific Reports

Figure 6

From: Subwavelength acoustic monopole source emission enhancement through dual gratings

Figure 6

Dependence of the 1st (lowest) and 2nd (second lowest) resonance frequencies on the separation d between the two annuli. The inner radius is fixed at 2 mm, and the thickness of both annuli is kept at 3 mm. The slits in the outer annulus always align with those in the inner annulus. Please note that d = 0 mm means the two layers merge into one single layer with a total thickness of 6 mm.

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