基于异形反射腔的特定波束覆盖的螺旋天线

A specific beam covered spiral antenna based on transmutative cavity

为满足卫星通信心形方向图的要求,依据指数曲线方程,设计了一种平衡馈电的带有异形反射腔的锥状等角螺旋天线。为了抑制同轴线外导体电流致天线方向图发生畸变,实现平衡馈电,采用了一种易于调节阻抗匹配的板线平衡器结构;为了解决反射板造成天线方向图轴向上出现零点的问题,提高天线的辐射效率,采用了异形反射腔模型。对天线进行了实物加工测试,实测结果表明,天线除了在宽频带内具有良好辐射特性外,还具有稳定的心形方向图,其性能指标符合设计要求。

According to the requirements of specific heart-shaped radiation patterns,a balanced feed conical equiangular spiral antenna based on transmutative cavity is designed according to the exponential curve equation.The plate line balancer is designed to curb the coaxial outer conductor current induced orientation map distortion and achieve a balanced feed.In order to improve the radiation efficiency of conical equiangular spiral antenna and solve the problem of the antenna pattern axial appeared against by the common reflector,a transmutative cavity is designed.The antenna is manufactured and tested,measurement results show that the antenna has stable heart-shaped radiation patterns,the performance indicators meet the design requirements.