Figure 12
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Reflection coefficient modulus as a function of frequency for optimized ABHs with different number of ribs N; solid lines–prediction employing the Riccati equation, dashed lines–validation employing 2D FEM model. In all the cases, L = 25 cm, hrib = 0.25 mm, Rmin = 0.25 mm. Inset figure shows the corresponding shape functions.
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