Optimum beam steering of linear phased arrays
Optimum beam steering of linear phased arrays
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DOI：
10.1016/s0165-2125(98)00039-0
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发表时间：
1999-04-01
期刊：
影响因子：
2.4
通讯作者：
Shi, YJ
中科院分区：
文献类型：
--
作者：
Wooh, SC;Shi, YJ
建立了超声线性相控阵辐射波的声压分布计算模型。在此基础上，研究了不同换能器参数（元件数、元件间距、元件宽度和换能器频率）下的波束方向性和导向性。通过最小化主瓣宽度、消除光栅瓣和抑制旁瓣，确定了最优的换能器参数以获得最佳的波束指向性。结果表明，当元件宽度小于波长或转向角较小时，相控阵的解可以用离散线源的简单解近似求得。元件间距和元件数量对换能器的性能有重要影响。(C) 1999 Elsevier Science B.V.版权所有
A model was developed to compute acoustic pressure distribution of the waves radiated from an ultrasonic linear phased array. Based on the model, beam directivity and steerability were studied for various transducer parameters such as number of elements, inter-element spacing, element width, and transducer frequency. Optimal transducer parameters were determined to obtain the best beam directivity by minimizing the main lobe width, eliminating grating lobes, and suppressing side lobes. It was shown that the solutions for the phased arrays can be reasonably approximated by the simple solutions of discrete line sources, if the element width is reasonably smaller than the wavelength or the steering angle is relatively small. The inter-element spacing as well as the number of elements plays an important role in determining transducer performances. (C) 1999 Elsevier Science B.V. All rights reserved.