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Real and imaginary parts of the dynamic properties for an acoustic metafluid with 20% of soft porous silicone micro-beads versus the frequency. (a) The acoustic index n (= n′ + in″), (b) the constitutive parameters: bulk modulus κ (= κ′ + iκ″) and mass density ρ (= ρ′ + iρ″) and (c) the ratio (ρ″/ρ′)/(κ″/κ′). The shaded area [0.14–0.3 MHz] corresponds to the negative-index frequency band (n′ < 0).
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