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在低副瓣波导行波阵天线设计中使用大倾角缝隙单元,并通过加载极化栅的方式抑制交叉极化能量,可有效单元提高等效电导和辐射能力,减少波导线阵对单元数的限制。计算分析了大倾角缝隙单元参数特性,并对交叉极化栅进行优化设计。最后,给出了40个缝隙单元的波导天线的实例,实测结果与仿真设计一致,表明该分析与设计方法正确有效,且可推广应用于各种口径的低副瓣波导裂缝天线设计。
In the design of the low side-lobe waveguide array antenna, a large-angle slot cell is used and the cross-polarization energy is suppressed by loading the polarization grid. The effective cell can improve the equivalent conductance and radiation capability, reduce the number of pairs limit. The parametric characteristics of large-angle slot units are calculated and analyzed, and the cross-polarization grids are optimized. Finally, an example of a waveguide antenna with 40 slot elements is given. The measured results are consistent with those of the simulation design. The results show that the proposed method is accurate and effective and can be widely applied in the design of low sidelobe waveguide crack antennas of various diameters.