收发等波束的双频低副瓣多波束天线

内容简介：介绍了一种可实现收发波束大小一致的工作于K/Ka频段的低副瓣反射面多波束天线系统。该天线系统采用高效率双频多模喇叭作为馈源,实现了收发频段共用同一反射面,极大地降低了系统的规模。通过对反射面口径场上幅度和相位的分布对天线二次辐射方向图的影响的分析,提出了一种在高频处对反射面引入副瓣照射的方法,从而实现了收发波束大小一致。该天线系统在收发频段均体现了良好的低副瓣、高载干比特性。

Abstract：A dual-band muhiple beam antenna system with low sidelobes and equal beamwidths, which can work at K/ Ka bands, is introduced in this paper. This antenna employs common reflectors at both bands by using dual-band multi-mode horn with high efficiency, which reduces the system size greatly. By analyzing the influence of the field and phase range on the reflector aperture to the secondary radiation pattern, a method of introducing sidelobe radiation in the reflector aperture at high frequency is proposed in this paper, which can realize the same beam size at both bands. This antenna system also shows good low-sidelobe and high ratio of the co-polar directivity to the combined interference directivity characteristic at both bands.

作者：王虎, 李正军, 曹多礼,

关键词：多波束天线, 收发一致, 双频多模喇叭, 低副瓣, 口径效率,