Ku/Ka四波段共馈低剖面赋形天线设计

针对传统切换式多馈源的低剖面反射面天线结构复杂，不能多频段同时工作的问题，介绍了一款四波段单馈源低剖面环焦反射面天线及设计方法。该天线工作在四波段14~14.5 GHz, 11.45~12.75 GHz,19.6~21.2 GHz,29.4~31 GHz。整体天线采用双槽深波纹喇叭单馈源、通过口面场分布和多项式拟合过渡函数的方法构造的赋形副反射面和主反射面。用电磁仿真软件进行了建模仿真和验证。实测结果表明，整体天线较传统天线的效率提高12%以上，第一旁瓣<-14 dB，指标满足设计要求。

Ku/Ka quad-band common-feed low-profile shaped antenna design

Traditional multi-band low-profile parabolic antennas bear the disadvantages of complex structure and the inability to multi-band work simultaneously. A novel design method is introduced in this paper. The proposed quad-band antenna works on the frequency of 14-14.5 GHz,11.45-12.75 GHz,19.6- 21.2 GHz,29.4-31 GHz. The whole antenna adopts a two-slot-depths horn feed, shaped sub-reflector and main reflector. The reflectors are designed by the aperture field distribution function and polynomial transition function. The overall antenna structure is optimized with full-wave electromagnetic software. The test result shows the efficiency in the entire frequency band is improved by at least 12%, and the first side lobe is controlled below -14 dB, which meets the performance requirements. This design has been applied to actual equipment successfully.