基于介质波导混合模式的双频馈源喇叭天线  

Dual Band Feed Horn Antenna Based on Dielectric Waveguide Hybrid Mode

作　　者：王珂 刘熠 张琳 WANG Ke;LIU Yi;ZHANG Lin(The 39th Research Institute of China Electronics Technology Group Corporation,Xi'an 710065,China;Shannxi Key Laboratory of Antenna and Control Technology,Xi'an 710065,China)

机构地区：[1]中国电子科技集团公司第三十九研究所,西安710065 [2]陕西省天线与控制重点实验室,西安710065

出　　处：《微波学报》2021年第3期19-23,共5页Journal of Microwaves

摘　　要：随着大型反射面天线技术的不断发展,天线系统对设备功能的多样化与一体化提出了更高的要求,馈源作为大型反射面天线的核心,其性能决定了反射面天线整体特性。文章基于介质波导混合模式提出了一种介质加载双频馈源喇叭天线,工作于X(7.25~7.75 GHz)/Ka(21~22 GHz)频段。利用特征值理论求解双层介质波导中电磁场表达式,通过改变双层介质波导拓扑结构,形成表面波态的混合模式HE11。在X频段由于喇叭口径小,形成了E面H面等化的方向图;在Ka频段,通过改变介质锥形状,形成类似点源辐射,也形成了E面H面等化、交叉极化低的方向图。对该馈源进行加工并测试,测试方向图与仿真结果较为吻合。将该馈源应用于卫星地面接收系统的13 m环焦反射面天线,经验证,该天线在工作频段口面效率均≥60%。With the continuous development of large reflector antenna technology, higher requirements are put forward for the diversification and integration of equipment functions. Feed as the core of large reflector antenna, its performance determines the overall characteristics of reflector antenna. In this paper, a dielectric loaded dual band horn antenna is proposed based on the hybrid mode of dielectric waveguide. The antenna works in X(7.25-7.75 GHz) and Ka(21-22 GHz) band. The eigenvalue theory is used to solve the expression of electromagnetic field in double-layer dielectric waveguide. By changing the topology of double-layer dielectric waveguide, the mixed mode HE11 of surface wave state is formed. In X-band, due to the small aperture of the horn, the E-plane and H-plane equivalent pattern is formed. In Ka band, by changing the shape of dielectric cone, the similar point source radiation is formed, and the E-plane H-plane equivalent pattern with low cross polarization is also formed. The feed is processed and tested, and the test pattern is in good agreement with the simulation results. The feed is applied to the 13 m ring focal reflector antenna of the satellite ground receiving system, and is verified that the aperture efficiency of the antenna in the working frequency band is more than 60%.

关 键 词：介质 混合模 双频 喇叭天线 

分 类 号：TN823[电子电信—信息与通信工程]