用于单脉冲的脊波导缝隙相频扫天线设计  

Design of ridged waveguide slot phase-frequency sweep antenna for monopulse

作　　者：马得原 李少甫[1] 唐家轩 MA Deyuan;LI Shaofu;TANG Jiaxuan(School of Information Engineering,Southwest University of Science and Technology,Mianyang 621010,Sichuan Province,China)

机构地区：[1]西南科技大学信息工程学院,四川绵阳621010

出　　处：《电子元件与材料》2022年第3期284-290,共7页Electronic Components And Materials

基　　金：国家自然科学基金委员会—中国工程物理研究院NSAFL联合基金(U1830201)。

摘　　要：对于单人便携式单脉冲雷达,设计高增益、宽扫描角度、低副瓣电平和低剖面的天线阵列对提高其探测距离、探测范围和探测精度有着非常重要的意义。设计了一种S型脊波导缝隙相频扫天线,采用S型脊波导来缩减波导的宽边尺寸,增加频率扫描波束范围。将频率扫描线阵分为两个子阵,采用同侧馈电,分别进行Taylor幅度加权,在保证分段处幅度和相位连续性的同时降低了副瓣电平,同时获得和、差波束。考虑到缝隙间的互耦,采用软件提参拟合的方法,降低了互耦对方向图的影响,提升了缝隙设计的准确度。该天线由48列76元的频率扫描线阵构成,仿真结果表明,在31.6~38 GHz频段内VSWR<2,接近法向增益大于39 dB,副瓣电平小于-20 dB,方位向相位扫描波束范围大于±30°,俯仰向频率扫描波束范围大于18°。该天线剖面低、重量轻、易于加工、性能优良,可用于便携式单脉冲雷达。For single-person portable monopulse radar,designing an antenna array with high gain,wide scanning angle,low sidelobe level and low profile is of great significance to improve its detection distance,range and accuracy.In this paper,an S-shaped ridged waveguide slot phase-frequency sweep antenna was designed.And the S-shaped ridged waveguide was used to reduce the width of the waveguide and increase the frequency scanning beam range.The frequency scanning linear array was divided into two sub-arrays,which are fed on the same side,and Taylor amplitude weighting was carried out,respectively,the sidelobe level was reduced while ensuring the continuity of the amplitude and phase at the subsection,and the sum and difference beams were obtained at the same time.Considering the mutual coupling between the slots,the method of software parameter fitting was adopted.As a result,the influence of mutual coupling on the pattern was reduced and the accuracy of the slot design was improved.The antenna consists of 48 columns of 76-element frequency scanning linear array.The simulation results show that in the frequency band from 31.6 GHz to 38 GHz,the VSWR<2,the near normal gain is greater than 39 dB,the side lobe level is less than-20 dB,the azimuth phase scanning beam range is greater than±30°,and the elevation frequency scanning beam range is greater than 18°.The antenna has low profile,light weight,easy processing and excellent performance,which can be used in portable monopulse radar.

关 键 词：S型脊波导 脊波导裂缝天线 相频扫天线 单脉冲天线 

分 类 号：TN823.24[电子电信—信息与通信工程]