通过数值计算发现：将抛物线绕通过焦点的非抛物线对称轴旋转而形成的赋形抛物面天线可产生环状的方向图主瓣（此主瓣指的是主瓣最大值处）。最后给出了计算方法和计算结果。计算结果表明：E或H平面内环状方向图主瓣两最大峰值间的夹角可在很大范围内变化，低副瓣电平较难得到。

A calculation method and calculation results that show that a new kind of shaped paraboloid antennas can produce a ringy radiation pattern is presented. Angle between mainlobe maxium peak value to ring shape direct in E or H plane varied in a wide range. The lwo sidelobe level is difficult to gain.

TN823