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Advances in Materials Science and Engineering
Volume 2015, Article ID 626593, 6 pages
Research Article

A Novel Approach to Density Near-Zero Acoustic Metamaterials

Department of Power Engineering, Electronics and Telecommunications, Faculty of Technical Sciences, University of Novi Sad, 21000 Novi Sad, Serbia

Received 15 May 2015; Accepted 13 September 2015

Academic Editor: Jainagesh A. Sekhar

Copyright © 2015 Milan Sečujski et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The study demonstrates the possibility of achieving near-zero propagation of sound waves in acoustic metamaterials based on a membrane-based metamaterial unit cell which exhibits effective mass density of Lorentzian type. The unit cell, which represents the acoustic counterpart of the split ring resonator, was previously used as a building block of left-handed metamaterials, as it exhibits negative density at certain frequencies. In this study we show that its application can be extended to achieving propagation of sound waves at a frequency where its effective density equals zero. This effect can be exploited in a range of applications where extremely low phase variation over long physical distances is required, such as energy tunneling or tailoring the acoustic radiation phase pattern in arbitrary ways. After discussing the dependence of the frequency response of the unit cell on the properties of the host, we show that it can be used to design near-zero acoustic filters with low insertion loss and steep roll-off. Finally, we show that it can be used to achieve simultaneous near-zero propagation at multiple, independently chosen frequencies.