低副瓣波导窄边非倾斜缝天线研究

A Study on Untilted Edge Slotted Waveguide Antenna with Low Sidelobe

在波导窄边非倾斜缝隙单元两侧加金属扰动块,可以有效提高缝隙单元的等效电导和辐射能力,该方法应用于波导窄边行波阵天线设计,可减少波导行波线阵对缝隙单元数的限制。文中计算分析了长方体金属扰动块的物理参数与缝隙单元等效电导间关系,供设计时选用。最后,给出了16个缝隙单元的波导线阵的实例,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。

A metal knob putted at both sides of untihed slot in the narrow wall of a rectangular waveguide can effectively improve its equivalent conductance and radiation characteristic. This method can be used to design the traveling wave array antenna in the nar- row wall of a rectangular waveguide, which can reduce the limit of number of slots in the waveguide linear array. The physical pa- rameter and equivalent conductance of the metal cuboid is calculated and the relationship between them is also analysed. To sum- marize, there are four main categories, which can be choose in design. Finally the waveguide linear array with 16 slots is presen- ted, 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.