毫米波基片集成波导裂缝阵列天线研究

Research on Millimeter Waves SIW Slotted Array Antenna

毫米波基片集成波导裂缝阵列天线具有频带宽、辐射效率高和剖面薄等优点,对实现毫米波雷达导引头的小型化研制工作具有重要的工程意义。根据基片集成波导理论,采用阵列天线设计方法,研究了基于微带贴片加载形式的单元裂缝天线频率带宽拓展方法;基于基片集成波导的平面馈电网络设计方法,设计了16×12微带贴片加载的基片集成波导裂缝阵面结构、并馈基片集成波导功率分配及和差波束形成网络,使用HFSS对天线模型进行了仿真分析和优化设计,研制了毫米波频段单脉冲基片集成波导裂缝阵列天线样机实物。经测试,天线带宽大于1 GHz,效率优于30%,驻波小于2,厚度仅为4 mm,指标测试结果与设计相符合。

Millimeter-wave substrate integrated waveguide slot array antenna has the advantages of wide bandwidth,high radiation efficiency and thin profile. It is of great engineering significance to realize the miniaturization of millimeter-wave radar seeker. Based on the theory of integrated waveguide and array antenna design method,the method of expanding the frequency bandwidth of slot antenna based on microstrip patch loading,and the design method of planar feed network based on integrated waveguide are studied. The slot array structure of integrated waveguide loaded with 16 × 12 microstrip patches is designed. The parallel power distribution and sum-difference beamforming network of feed-substrate integrated waveguide is simulated and optimized by HFSS. A prototype of millimeter-wave band monopulse integrated waveguide slot array antenna is developed. The test results show that the antenna bandwidth is greater than 1 GHz,and the efficiency is better than 30%. Besides,the VSWR is less than 2,and the thickness is only 4 mm. The test results are consistent with the design.