Effective impedance boundary optimization and its contribution to dipole radiation and radiation pattern control

Radiation pattern control has generated much interest recently due to its potential applications. Here we report the observation of high-efficiency dipole-like radiation of sound with broad bandwidth through a decorated plate with periodical two-dimensional Helmholtz resonators on both sides and a s...

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Bibliographic Details
Published in:Nature communications 2014-01, Vol.5 (1), p.3188-3188, Article 3188
Main Authors: Quan, Li, Zhong, Xu, Liu, Xiaozhou, Gong, Xiufen, Johnson, Paul A.
Format: Article
Language:English
Subjects:
639/766/25/3927
Acoustics
Bandwidths
Coordinate transformations
Humanities and Social Sciences
multidisciplinary
Propagation
Radiation
Science
Science (multidisciplinary)
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Summary:Radiation pattern control has generated much interest recently due to its potential applications. Here we report the observation of high-efficiency dipole-like radiation of sound with broad bandwidth through a decorated plate with periodical two-dimensional Helmholtz resonators on both sides and a single slit at the centre. The decorated plate was optimally designed to adjust the effective impedance of the boundary, and the underlying mechanism of radiation pattern control is attributed to wave vector tailoring. The high radiation efficiency is due to the Fabry–Perot resonances associated with waveguide modes in the centre slit. The method to obtain a collimated beam without any sidelobes is also provided. Our findings should have an impact on acoustic applications. Controlling sound waves is important to build better acoustic devices, and much can be learnt from optical approaches. To this end, Quan et al. show how periodic arrays of Helmholtz resonators on metal plates can produce dipole-like radiation patterns for sound.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms4188