基于间隙波导的低剖面毫米波单脉冲天线设计  

Design of Low Profile Millimeter Wave Monopulse Antenna Based on Gap Waveguide

作　　者：何涛 姜兴[1] 彭麟[1] HE Tao;JIANG Xing;PENG Lin(College of Information and Communication,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学信息与通信学院,桂林541004

出　　处：《微波学报》2024年第5期15-20,38,共7页Journal of Microwaves

基　　金：广西自然科学基金(2021JJA170177);广西研究生教育创新计划项目(YCBZ202022113);电动汽车电机及控制器(MCU)研发及产业化(桂科AA19254012)。

摘　　要：针对近些年来单脉冲雷达系统对天线的低剖面、宽频带、高效率的需求,本文设计了一种基于脊间隙波导的圆口面低剖面单脉冲阵列天线,通过去除传统的背腔层,引入双脊形辐射缝隙替代传统的矩形缝隙来拓宽带宽。相比于传统的宽边纵缝串联馈电和背腔缝隙并联馈电单脉冲天线的四层以上的结构,整个天线的层数仅为三层,结构更为紧凑。同时设计了宽带不等功分器,降低了天线副瓣。天线中心频率为35 GHz,覆盖了32.6 GHz~37.4 GHz,约4.8 GHz的频带范围,相对阻抗带宽达到了13.7%,副瓣小于-20 dB,零深优于-35 dB,天线效率大于60%,满足当前单脉冲雷达系统对天线的要求,具有广阔的应用前景。In response to the demand of low profile,wide band,and high efficiency of antennas in monopulse radar systems in recent years,a circular aperture low profile monopulse antenna based on ridge gap waveguide is designed.The bandwidth is expanded by removing the traditional back cavity layer and introducing double ridge shaped radiation slots to replace the traditional rectangular slots.Compared to the traditional four layer or more structure of the traditional wide edge longitudinal slot series feeding and back cavity slot parallel feeding monopulse antenna,the entire antenna has only three layers,making it more compact in structure.At the same time,a broadband unequal power divider is designed to reduce antenna sidelobes.The center frequency of the antenna is 35 GHz,covering a frequency range of 32.6 GHz~37.4 GHz,approximately 4.8 GHz.The relative impedance bandwidth reaches 13.7%,the sidelobe is less than-20 dB,the zero depth is better than-35 dB,and the antenna efficiency is greater than 60%.It meets the requirements of current monopulse radar systems for antennas and has broad application prospects.

关 键 词：间隙波导 单脉冲天线 低剖面 宽频带 

分 类 号：TN822.4[电子电信—信息与通信工程]