| 张天伟,陈航,杨虎.小型化线列阵研究[J].声学技术,2008,(6):816~820 |
| 小型化线列阵研究 |
| Study of miniaturized linear array |
| 投稿时间：2008-04-12 修订日期：2008-07-22 |
| DOI： |
| 中文关键词: 小型化 单向性 超指向性 端射阵 恒定束宽 |
| 英文关键词: miniaturization unilateral directivity super directivity end fire array constant beam width |
| 基金项目: |
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| 摘要点击次数: 1097 |
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| 中文摘要: |
| 介绍了一种小型化线列阵,阵结构与常规线列阵最大的不同在于阵元间距小于四分之一波长。通过理论分析和仿真计算优化了各阵元的最佳权系数,获得了良好的指向性,得到了实验的证明。小型化线列阵的指向性图具有四大特点:①单向性:仅在半空间出现一个轴对称的主波束,无栅瓣和次瓣。②端射特性:主波束出现在线阵的轴射方向。③超指向性:在阵的尺寸远小于二分之一波长条件下不仅可以获得良好的指向性图,并且波束宽度随阵元间距的减小而减小。④恒定束宽特性:在阵元间距小于八分之一波长条件下,波束宽度随频率变化非常平缓。这种小型化基阵也可用于大型基阵如拖曳阵和展开式体积阵的子基阵,进行低频宽带信号的检测。 |
| 英文摘要: |
| A kind of miniaturized linear array is studied.The biggest difference between this kind of array and conventional line array is that the element spacing is less than a quarter of a wavelength.Through theoretical analysis and simulation to optimize the weight of the array elements,the good directivity pattern is obtained,and verified by experiment.The directivity pattern of the miniaturization linear array has four major characteristics:①unilateral directivity:Only has an axially symmetric major lobe in half-space without grating lobes and minor lobes.②end fire:The major lobe appeared in the axial direction of the array.③super directivity:The good directivity pattern can be obtained under the condition that the size of this array is far less than half wavelength,and the beam width reduces along with reducing element spacing.④constant beam width:Under the condition that the element spacing is less than 1/8 wavelength,the variation of the beam width is gentle along with frequency shifting.This kind of miniaturized array is not only suitable for small-sized installment platform uses,but also can be used as a sub-array in the large-scale array,such as towing array and expansion array,for the detection of low frequency wideband signal. |
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