馈源杯圆度误差对螺旋天线电性能的影响分析

馈源阵作为星载天线的核心部件，其馈源辐射杯圆度误差显著影响天线的馈电性能，因此，探究馈源单元电性能与圆度误差的关联性极为重要。以某卫星天线馈源阵三维单馈源为例，基于几何绕射理论，将圆度误差引入方向图函数，建立了电磁耦合模型；基于FEKO电磁软件，分析了圆度误差对馈源单体最大增益、波束宽度等主要馈电性能指标的影响规律。研究结果表明，频率越大，增益与波束宽度对圆度误差越敏感。当馈源杯直径存在尺寸误差时，圆度误差导致的电性能变化与尺寸误差之间为振荡关系。文章研究工作可为探求天线制造误差与电性能的关联性提供一定的借鉴与指引。

Influence analysis of roundness error of feed cup body of helix antenna on electrical performance

Antenna feed array is deemed as a core component of antenna on satellite, and its manufacturing errors significantly determines the electrical performance of antenna, so it is vital to explore the correlation between the electrical performance and the manufacturing errors. Based on geometrical theory of diffraction (GTD), the roundness error is introduced into the radiation pattern function, and the electromagnetic coupling model is established. Based on FEKO, the influence of roundness error on the electrical performance such as gain and half power beamwidth (HPBW) of feed cup body was analyzed. The results show that the gain and HPBW are more sensitive to roundness error with higher frequency. When there is a dimension error of the feed cup, there is an oscillatory relationship between the electrical property change caused by roundness error and dimension error. Research in this paper provides some reference and guidance for exploring the correlation between the manufacturing error and electrical performance of satellite-borne antenna.