Analysis of Feed Defocuss Effects on a Ka-Band Parabolic Antenna

摘要：

　　The parabolic reflectors of deep space antennas are influenced by many facts,such as fabrication error,gravity and thermal deformation,which induce the feed deviating from the focal point of the paraboloid.The feed defocus would introduce phase errors over the paraboloidal dish,and degrade the antenna per-formance.In this paper,first the feed defocus is discussed from the view of reflector geometry,and the corresponding path length difference is derived.Then the effects on a Ka-band deep space parabolic antenna with 35-m diameter are analyzed as an example.From geometrical analysis and numerical calculations,the effects of feed defocus on some important antenna parameters such as gain,sidelobe level and pointing error are given and summarized.Finally,a method of feed defocus calibration is proposed.

关键词： Parabolic antenna Feed defocus Antenna pattern Gain Sidelobe level

作者: Guolong He

作者单位: Beijing Institute of Tracking and Telecommunications Technology,Beijing 100094,China

会议类型: 国际会议

会议名称: The First International Conference of National Soft Power (第一届国际软实力学术研讨会)

会议地点: 济南

会议语种:英文

页码: 189-196

在线出版日期: 2011-10-22（万方平台首次上网日期，不代表论文的发表时间）