一种Ku波段混合馈电频扫天线阵设计

研制了一种俯仰向波束固定，方位向频扫的Ku波段频扫平面天线阵.采用双层微带结构获得带宽约18%的宽带微带贴片天线作为阵列单元.天线阵俯仰向采用微带功分器及该种天线单元组成线阵.方位向为实现波束较大范围的频扫能力, 并提高天线阵的工作效率采用波导慢波线缝隙与线阵微带线电磁耦合结构进行馈电.在采用HFSS软件完成仿真设计的基础上，加工并测试了一套12×40规模的天线阵，结果表明该天线阵在工作频段内驻波比优于1.5，波束扫描范围大于80, 副瓣电平优于-20 dB，除中心频点外，增益大于26.5 dB.

Design of a Ku-band frequency-scanning antenna array fed by hybrid structure

A Ku-band antenna array with fixed beam in elevation and frequency-scanning beam in azimuth was designed and implemented. By introduced double-layer microstrip patch configuration, element of the column linear array with 18% bandwidth was designed. In order to realize the beam scanning with frequency changed in azimuth and improve the array efficiency, the waveguide slow-wave line structure with electromagnetic coupled slot on narrow side was used as feed line. Based on the successful simulation results achieved by HFSS software, antenna array with 12×40 elements was implemented and tested. The results show that, except at the center frequency, the voltage standing wave ratio(VSWR) of the antenna array is below 1.5 at the operation band, the scan scope is up to 80 degree, the sidelobe is below -20 dB, and the gain is more than 26.5 dB.