低副瓣波导窄边大倾角缝隙天线研究

Study on Large Angle Slotted Waveguide Antenna with Low Sidelobe

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。

Metal columniations putted at narrow wall of a rectangular waveguide to restrain cross-polarization can increase the angle of slots, effectively improve the equivalent conductance and radiation characteristic. This method can be used to design the traveling wave array antenna in the narrow wall of a rectangular waveguide, which can reduce the limit of number of slots in the waveguide linear array. The physical parameter and equivalent conductance of the large angle slot is calculated and the relationship between them is also analysed. Finally the waveguide linear array with 40 slots is presented, and the result of test is consistent with that of the simulation design, which has indicated that the analysis and design method is effective. The result can be used in design of wavefuide slot antenna with low sidelobe for all kinds of aperture.