一种含误差的双弯曲反射面天线的新建模方法

A Novel Method to Model the Dual Curved Reflector Antenna with Tolerance

提出了一种新的双弯曲反射面天线的建模方法,在拉格朗日插值和三次样条插值的基础上进行滑动平均,建立了具有馈源三维实体的含误差的双弯曲反射面天线模型,充分考虑了反射面模型的精度和光滑性,基于FMM给出了天线反射面存在不同加工误差和馈源安装误差情况下的赋形反射面电性能的分析,并比较了仿真结果与测试值,二者吻合性良好。结果表明:该建模方法有效,计算结果可靠,对误差设计和降低制造成本具有重要的参考价值。

A new method to set up the model of dual curved reflector antenna is presented. Based on the methods of Lagrange interpolation and cubic spline interpolation, the three nearest points on the surface are averaged. The mode of dual curved reflector with tolerance including the practical feed is set up , which calculates the precision and smoothness of the surface. The far field of the shaped reflector antenna with different manufacture error and installing error is modeled and analyzed using the method of FFM. Comparisons between the calculated results and those measured are made, which show good agreement. The results indicate that the fitting method is effective and the calculated results are reliable, which are very useful for the designer to present the proper design error and reduce the cost of manufacture.