宽带端馈式同轴矩形波导天线单元的研究

端馈式同轴矩形波导作为同轴波导变换,前人已经作了很详细的分析计算.由于端馈式同轴矩形波导与自由空间匹配困难,它很少用作辐射天线单元.本文用环耦合法和FDTD法对这种三维非均匀天线单元结构的特性进行了深入的研究,不仅减少了计算时间和空间,而且提高了计算精确性,得到这种相控阵天线单元的辐射方向图和驻波特性曲线,并进行了实验验证,解决了端馈式同轴矩形波导与自由空间的匹配问题.研究表明该种相控阵天线单元具有带宽宽、大扫描角的特点,可以广泛的用于地面、机载和星载相控阵雷达或者通信系统.

Research of Broadband Coaxial-to-Rectangular Waveguide End Launcher Antenna Element

Coaxial-to-rectangular waveguide transition of end launcher has been analyzed and computed detailedly.But the coaxial-to-rectangular waveguide is rarely used as a radiation element for it is difficult to match with free space.This paper applies both loop coupling approach and FDTD method to analyze the three-dimension non-even antenna element,not only reduces computing time and volume,but also improves the accuracy,then gets the radiation pattern and VSWR characteristic figure,proves it with experiment,and solves the match problem of free space.The research proves that this phased array radar element has characters of broadband、big scanning angle,which can be used in ground、airborne and satellite phased array radar or communication system.