由于反射面天线中抛物盒顶部开口所造成结构不连续，使其开口处产生的散射场对抛物盒的反射场干涉而造成口径场畸变，从而导致了天线副瓣性能变差。该文根据天线方向图与其口径场之间的关系，通过理论分析和仿真计算，分析、讨论了口径场分布影响天线副瓣性能的主要机理。

The discontinuity at the edge of the reflector makes the scattered field from the discontinuity interfere the reflected field of the parabolic surface, resulting in degeneration of the antenna side lobe level. According to the relation ship of the antenna pattern and the aperture field, the mechanism of how the aperture distribution affects the antenna sidelobe level is analyzed and discussed through theoretical analysis and simulation calculation.

TN821