The effect of viscoelastic losses in a high-density contrast sonic band-gap material of close-packed rubber spheres in air is discussed. The scattering properties of such a material are computed with an on-shell multiple-scattering method, properties which are compared with the lossless case. The existence of an appreciable omnidirectional gap in the transmission spectrum, when losses are present, is also reported.
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I. E. Psarobas (2001) studied this question.
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