Tunable acoustic radiation pattern assisted by effective impedance boundary |
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| Institution: | 1. Key Laboratory of Modern Acoustics, Institute of Acoustics and School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;2. College of Physics & Electronic Engineering, Changshu Institute of Technology, Changshu 215500, China;3. Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78713, USA |
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| Abstract: | The acoustic wave propagation from a two-dimensional subwavelength slit surrounded by metal plates decorated with Helmholtz resonators(HRs) is investigated both numerically and experimentally in this work. Owing to the presence of HRs, the effective impedance of metal surface boundary can be manipulated. By optimizing the distribution of HRs,the asymmetric effective impedance boundary will be obtained, which contributes to generating tunable acoustic radiation pattern such as directional acoustic beaming. These dipole-like radiation patterns have high radiation efficiency, no fingerprint of sidelobes, and a wide tunable range of the radiation pattern directivity angle which can be steered by the spatial displacements of HRs. |
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| Keywords: | effective impedance boundary acoustic radiation pattern Helmholtz resonator |
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