基于分形的低副瓣天线阵列研究

Research on Low Side-Lobe Fractal Antenna Arrays

通过对Cantor集线阵及其补集、同心圆环分形阵的阵列因子方向图特性的分析，指出大间距的分形阵列方向图具有高副瓣的缺点，提出了通过分形阵列阵元的锥削密度加权和少量大间距单元幅度加权相结合的方法来抑制副瓣，改善分形阵的方向图性能，给出了两种具有分形特点的高效率、低副瓣阵列形式和实际测试结果，为分形天线阵列的工程化应用提供了思路。

This paper introduces the Cantor set array, its complement and concentric ring array, discusses the disadvantages of their high side-lobe on radiation pattern with a large space for the fractal array. The paper proposed a technology to suppress side-lobe by adopting the density-weighted and the amplitude weighting of part of array elements. It shows two types of high efficiency, low side-lobe fractal arrays and actual measurement results, gives the concrete thinking about the future engineering applications of fractal antenna arrays.