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

Li Quan, Xu Zhong, Xiaozhou Liu (), Xiufen Gong and Paul A. Johnson
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Li Quan: Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics and School of Physics, Nanjing University
Xu Zhong: Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics and School of Physics, Nanjing University
Xiaozhou Liu: Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics and School of Physics, Nanjing University
Xiufen Gong: Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics and School of Physics, Nanjing University
Paul A. Johnson: Geophysics Group EES-17, Los Alamos National Laboratory

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract 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.

Date: 2014
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DOI: 10.1038/ncomms4188

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