卫星阵馈反射面赋形波束天线的一种高效旁瓣抑制方法

为了使卫星阵馈反射面赋形波束天线具有尽可能低的旁瓣电平,以降低日益增多干扰的影响,传统的波束赋形方法往往需要对约束点的数量和位置进行反复调整,故非常烦琐.因此本文在阵馈反射面天线的频域方向性相乘原理的基础上,提出了一种高效的旁瓣抑制方法,即在计算最佳激励系数时使用宽度较窄的点波束,而在计算赋形波束方向图时使用实际的点波束.由于这种方法通常只需要对少量约束点的位置进行调整,所以它可以高效地获得低旁瓣电平、高精度的赋形波束.

An Efficient Approach for Reducing the Side Lobe Levels of Array-Fed Reflector Satellite Shaped-Beam Antennas

To decrease the ever-increasing interferences from adjacent satellites,array-fed reflector satellite shaped-beam antennas are always required to produce as low sidelobe levels as possible. However, it is often difficult to realize this requirement for traditional beam-shaping methods, for which often suffer from repeated adjustment of the number and tbe locations of constraints before satisfactory results are obtained. Thus in this paper, based on the frequency-domain principle of pattern multiplication, an efficient approach is presented for array-fed reflector antennas, which can realize good sidelobe performance simply by using relatively narrower spot beams in the calculation of the optimal excitations but actual spot beams for the radiation patterns of the antenna. Since this approach only need adjust the locations of a few constraints, it can efficiently give shaped beams with satisfactory sidelobe levels.