矩形斜口面天线辐射性能

Radiation Performances of a Incline Rectangular Aperture Antenna

矩形斜口面天线是把矩形波导管两个窄边同时渐削 ,宽边尺寸保持不变而形成的开口 ,口面位于无限大完全导电平面上 ,被矩形波导中主模H10 模激励 .简化分析了口面电场和磁场分量以及辐射场表达式 ,主瓣指向偏离侧射方向 ,即方向图主波瓣指向偏离口面法线和激励波导轴线 .计算了主面方向图 ,给出了天线输入端电压驻波比 (VSWR)随频率的变化曲线 ,发现VSWR与口面倾角有关 ,通过采用不同的倾角 ,可使其获得改善 .

The incline rectangular aperture antenna is one whose opening is tapered only on both narrow sides of a rectangular waveguide, placed on a perfectly infinite conducting plane, excited by the dominant H 10 mode in the rectangular waveguide. The electric and magnetic field components over the aperture and radiated field formula are simply analyzed. The main beam pointing lies off broadside, namely the major lobe pointing deviates from the perpendicular of the aperture and the axis of the excited waveguide. The principal plane patterns have been calculated and the input voltage standing wave ratio (VSWR) versus measured frequencies is given. It is found that the VSWR is related to the incline angle of the aperture, and can be improved using different incline angles.