Acoustic metasurface structure and acoustic antenna device

Abstract

The invention discloses an acoustic metasurface structure. The acoustic metasurface structure comprises a first supercell and a second supercell which is transversely connected with the first supercell; the first supercell and the second supercell are in mirror symmetry; the first supercell comprises N first supercell units which are transversely arranged, and the refractive indexes of the first supercell units are reduced from a symmetry plane one by one according to a preset rule; the second supercell comprises N second supercell units which are arranged transversely, and the refractive indexes of the second supercell units are reduced from the symmetry plane one by one according to the preset rule; and N is not less than 2. According to the acoustic metasurface structure, cylindrical waves or spherical waves can be transformed into plane waves in a using process, so that the orientation of sound waves can be realized; and the supercell units are simple in structure and relatively high in overall transmissivity, so that the intensity of sound signals in a propagation process can be ensured. An acoustic antenna device has the abovementioned same beneficial effects.

Description

technical field [0001] Embodiments of the present invention relate to the field of acoustic technology, and in particular, relate to an acoustic metasurface structure and an acoustic antenna device. Background technique [0002] With the development of science and technology, the application of sound waves is becoming more and more extensive. At present, most sound sources are line sound sources or point sound sources. Line sound sources emit cylindrical waves, point sound sources emit spherical waves, and the reception of sound signals needs to be received in the form of plane waves, so it is necessary Convert cylindrical or spherical waves into plane waves to achieve the orientation of sound waves. [0003] In the prior art, the acoustic metasurface structure based on phase arrangement is mainly used to realize the conversion from cylindrical wave or spherical wave to plane wave, and to realize the orientation of the sound wave. The internal structure of the supercellula...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the acoustic metasurface structure based on phase arrangement is mainly used to realize the conversion from cylindrical wave or spherical wave to plane wave, and to realize the orientation of the sound wave. The internal structure of the supercell unit needs to be designed according to the corresponding phase, and the structure is complex, which leads to a decrease in the overall transmittance of the acoustic metasurface structure, and low conversion efficiency, which affects the intensity of the acoustic signal during propagation.

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