Metascreen-Based Acoustic Passive Phased Array
Metascreen-Based Acoustic Passive Phased Array
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DOI：
10.1103/physrevapplied.4.024003
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发表时间：
2015-08-06
影响因子：
4.6
通讯作者：
Zhang, Likun
中科院分区：
文献类型：
--
作者：
Li, Yong;Jiang, Xue;Zhang, Likun
传统的相控阵在形成复杂的波前时需要大量的信号源，导致单个信号源的操作复杂且成本高。我们提出了一种无源相控阵，它使用声变屏来传输来自单一声源的声能，并引导所传输的波前形成所需的场。变屏幕由沿屏幕具有离散分辨率的元素组成，分辨率小于波长的数量级，允许超出近轴近似的精细波前成形。通过形成自弯曲梁，在实验中验证了该方法的性能。我们基于变屏幕的无源阵列以其简单性和能力在传统有源阵列复杂和有局限性的地方得到了应用。
Conventional phased arrays require a large number of sources in forming a complex wave front, resulting in complexity and a high cost to operate the individual sources. We present a passive phased array using an acoustic metascreen that transmits sound energy from a single source and steers the transmitted wave front to form the desired fields. The metascreen is composed of elements that have a discrete resolution along the screen at an order smaller than the wavelength, allowing for fine wave-front shaping beyond the paraxial approximation. The performance is verified in experiment by forming a self-bending beam. Our metascreen-based passive array with its simplicity and capability has applications in places where conventional active arrays are complex and have limitations.