一种具有跟踪功能的Ka频段多波束馈源设计

Design of a Ka-Band Multi-Beam Feed with Tracking Function

为了应对卫星宽带多模体业务需求的逐渐提升,本文从喇叭馈源选取原则出发,提出了具有跟踪功能的多波束馈源设计时应考虑的两个关键因素,即馈源低频发射方向图的主瓣、高频接收方向图的第一旁瓣照射反射器,以及馈源在跟踪频段需具有良好的差模耦合特性,并给出了馈源的电气原理框图。在此基础上,设计了一款星载应用的Ka频段跟踪多波束馈源。实验结果表明本文所设计的多波束馈源能够满足设计指标,且实测结果与设计性能达到很好的一致性,具有较强的应用价值。

In order to deal with the increasing demand for the broadband satellite multimode services. This paper considers the principle of the selection of horn feed. It proposes two key factors that should be considered when the multi-beam feeds is designed. Both of the main lobe of the feed low-frequency emission pattern and the first side-lobe of the high-frequency reception pattern illuminate the reflector. Meanwhile, the feed has good differential mode coupling characteristics at the tracking frequency band, and the electrical block diagram of the feed is given. On this basis, a Ka-band tracking multi-beam feed for spaceborne applications is designed. Experimental results show that the multi-beam feeds designed in this paper can meet the conventional design indexes, and the measured results are in good agreement with the design performance. This method has a strong application value.