Concentric artificial impedance surface for directional sound beamforming | Zendy

Kyungjun Song | Zendy; Md. Anzan-Uz-Zaman | Zendy; JunHyuk Kwak | Zendy; JooYun Jung | Zendy; Jedo Kim | Zendy; Shin Hur | Zendy

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Concentric artificial impedance surface for directional sound beamforming

Author(s) -

Kyungjun Song,

Md. Anzan-Uz-Zaman,

JunHyuk Kwak,

JooYun Jung,

Jedo Kim,

Shin Hur

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4979179

Subject(s) - acoustics , electrical impedance , materials science , beamforming , optics , acoustic impedance , resonator , surface (topology) , physics , computer science , geometry , telecommunications , quantum mechanics , ultrasonic sensor , mathematics

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

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