基于CVT排布的非周期栅格密度加权阵设计

摘要

Density Tapered Arrays (DTA) with nonperiodic spaced elements have many interesting features when compared to traditional DTA in which antenna elements are located only at the intersections of periodic grid;however, a design method is yet to be fully develoed. A new approach is presented using Centroidal Voronoi Tessellations (CVT) to design DTA with nonperiodic element distributions proportional to the desired amplitude taper and with nonperiodic and‘uniform’ properties. A 32.8λdiameter circular aperture array with 1656 elements is discussed and theoretical patterns are computed for density tapers modeled after -25 dB,-30 dB,-35 dB, and -40 dB circular Taylor distributions. The obtained sidelobe levels and aperture efficiency are better than heretofore reported.%相比传统周期栅格密度加权阵，非周期排布密度加权阵有很多优点，但对非周期排布密度加权阵的设计方法却不完善。该文提出了一种利用质心Voronoi图设计密度加权阵的新方法，这种方法可以按照预期幅度加权设计非周期排布的密度加权阵，得到的单元排布具有非周期性和匀称性的特点。作为例子分析了一个直径为32.8λ的圆形阵，分别计算了按圆口径泰勒分布-25 dB,-30 dB,-35 dB和-40 dB副瓣设计的阵列方向图。相比已有文献中的计算结果，用该方法能获得更好的副瓣性能和口面效率。