Acoustic directional radiation and enhancement caused by band-edge states of two-dimensional phononic crystals
Acoustic directional radiation and enhancement caused by band-edge states of two-dimensional phononic crystals
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DOI：
10.1063/1.2335975
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发表时间：
2006-08-07
影响因子：
4
通讯作者：
Liu, Zhengyou
中科院分区：
文献类型：
--
作者：
Qiu, Chunyin;Liu, Zhengyou
本文用数值方法研究了放置在方晶格声子晶体中的线声源的辐射。他们的研究结果表明，在声子晶体的带边频率下，有可能获得具有大辐射增强的高方向性声源。辐射功率的角分布和辐射增强因子强烈地依赖于声源相对于其所在的单元格的位置。提出了一种半功率角宽度约为5.2度的高定向声源的简单实现方法。(c) 2006年美国物理研究所。
The authors numerically investigate the radiation of a line acoustic source placed inside a phononic crystal of square lattice. Their results show that it is possible to obtain a highly directional acoustic source with a large radiation enhancement, operating at the band-edge frequency of the phononic crystal. The angular distributions of the radiation power and the radiation enhancement factor are strongly dependent on the position of the acoustic source relative to the unit cell in which it is placed. A simple realization of a highly directional acoustic source with a half-power angular width of about 5.2 degrees is presented. (c) 2006 American Institute of Physics.