Effective impedance boundary optimization and its contribution to dipole radiation and radiation pattern control
Effective impedance boundary optimization and its contribution to dipole radiation and radiation pattern control
复制标题
有效的阻抗边界优化及其对偶极子辐射和辐射方向图控制的贡献
DOI：
10.1038/ncomms4188
复制
发表时间：
2014-01-01
影响因子：
16.6
通讯作者：
Johnson, Paul A.
中科院分区：
文献类型：
--
作者：
Quan, Li;Zhong, Xu;Johnson, Paul A.
辐射方向图控制由于其潜在的应用前景，近年来引起了人们的极大兴趣。在这里，我们报告的观察高效率的偶极状辐射的声音与宽带宽通过装饰板与周期性的二维亥姆霍兹共振器两侧和一个单一的狭缝在中心。通过优化设计装饰板来调节边界的有效阻抗，波矢剪裁是控制辐射方向图的基本机制。高辐射效率是由于与中心狭缝中的波导模式相关联的法布里-珀罗谐振。给出了获得无旁瓣准直光束的方法。我们的研究结果应该对声学应用产生影响。
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.