Concentric artificial impedance surface for directional sound beamforming

Utilizing acoustic metasurfaces consisting of subwavelength resonant textures, we design an artificial impedance surface by creating a new boundary condition. We demonstrate a circular artificial impedance surface with surface impedance modulation for directional sound beamforming in three-dimension...

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Bibliographic Details
Published inAIP advances Vol. 7; no. 3; pp. 035315 - 035315-6
Main Authors Song, Kyungjun, Anzan-Uz-Zaman, Md, Kwak, Jun-Hyuk, Jung, Joo-Yun, Kim, Jedo, Hur, Shin
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.03.2017
AIP Publishing LLC
Subjects
Acoustic impedance
Beamforming
Boundary conditions
Circularity
Helmholtz resonators
Patterning
Steering
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Summary:Utilizing acoustic metasurfaces consisting of subwavelength resonant textures, we design an artificial impedance surface by creating a new boundary condition. We demonstrate a circular artificial impedance surface with surface impedance modulation for directional sound beamforming in three-dimensional space. This artificial impedance surface is implemented by revolving two-dimensional Helmholtz resonators with varying internal coiled path. Physically, the textured surface has inductive surface impedance on its inner circular patterns and capacitive surface impedance on its outer circular patterns. Directional receive beamforming can be achieved using an omnidirectional microphone located at the focal point formed by the gradient-impeding surface. In addition, the uniaxial surface impedance patterning inside the circular aperture can be used for steering the direction of the main lobe of the radiation pattern.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4979179