基于模式控制的四脊喇叭馈源设计  

Design of quad-ridged horn feed based on controlling modes

作　　者：蔡颂一 杜彪[1,2] 何应然 Cai Songyi;Du biao;He Yingran(The 54th Research Institute of CETC,Shijiazhuang 050081,China;Joint Laboratory for Radio Astronomy Technology,NAOC&CETC54 Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,石家庄050081 [2]射电天文技术联合实验室,石家庄050081

出　　处：《电子测量技术》2020年第1期1-6,共6页Electronic Measurement Technology

摘　　要：四脊喇叭馈源具有较宽的工作频带,但随着频率变化波束宽度难于保持恒定,导致照射效率降低。为了提高天线的口径效率,提出了一种通过控制馈源口面模式设计四脊喇叭馈源的方法。首先以天线口径效率为目标,通过优化得出喇叭口面上的最优模式比例,然后通过改变四脊喇叭的结构参数来调控其口面的模比,使其逐渐逼近最优模比。利用该设计方法,设计了一个半照射角为40°的四脊喇叭馈源,在3∶1带宽内,方向图波束宽度恒定且具有旋转对称性,天线口径效率优于60%。The quad-ridged horn feed has a larger operating bandwidth. But it usually suffers from unconstant beamwidth with the variation of frequency that leads low aperture efficiency. In order to improve the antenna aperture efficiency, this paper proposes a method for designing a quad-ridged horn feed by controlling the horn aperture modes. Firstly, the antenna aperture efficiency is optimized to obtain the optimum modal content in the aperture, then the modal content is controlled by changing the structure parameters of the quad-ridged horn feed to gradually approach the optimum modal content. Using this design method, a quad-ridged horn feed with half-illumination angle of 40 degrees is designed. It achieves a near constant beamwidth and rotational symmetry in the radiation pattern over 3∶1 frequency range. The antenna aperture efficiency is better than 60%.

关 键 词：模式控制 四脊喇叭馈源 最优模比 

分 类 号：TN82[电子电信—信息与通信工程]