摘要
大型双反射面天线理论焦点和天线变形曲面最佳吻合反射面新焦点不重合,会造成天线偏焦而导致天线性能恶化的问题。通过对横向偏焦的分析,推导出了馈源横向偏焦的表达式,对馈源横向偏焦量对天线性能的影响进行了分析,提出了寻找新的吻合面和偏转副反射面的2种解决偏焦问题的方法,并以65 m天线为例分别进行了仿真计算,仿真结果表明这2种方法能够很好地解决这一问题。
The antenna performances are worsen for the reason that the academic focus of antenna is different from the one of the best-fit surface. Based on this question, this paper derives the expression for the offset of double-reflector antennae by analyzing feed offset. The radiation of offset parabolic antenna is analyzed. It also presents two solutions that are fitting a new reflector surface and turning over sub- reflector, which can solve the problem of the offset. The simulation calculation is implemented by taking 65m radio-telescope as an example, and the results indicate that the two methods can solve the question to the offset of double-reflector antennae very weB.
出处
《无线电工程》
2011年第8期35-37,共3页
Radio Engineering
关键词
偏焦
天线方向图
射电望远镜
offset focus
antenna pattern
radio-telescope
