星载大型高精度馈源阵抗热变形优化设计

为保证多波束天线在温度大范围变化条件下的指向性能,提出一种高热匹配性大型馈源阵设计方法.首先采用辐射状条形接口实现馈源相位中心自适应拟合,解决了以往热匹配设计时相位中心无法固定的问题;然后通过预设力弹簧来解决游离间隙配合引起的力学环境微损伤和指向变化问题;最后采用遗传算法对各条形接口的分布位置进行优化.利用该方法对某多...

Optimization design against thermal deformation for high precision large feed array onboard satellite

To ensure the directing performance of the multibeam antenna in a wide range of temperature variation, a method of designing the high thermal matching feed array is proposed in this paper. Firstly, the radial strip interface is used to realize the adaptive fitting of the feed phase center. Then the micro damage under the mechanical environment and the direction variation caused by the free clearance fit are solved by adopting the preset force spring. Lastly, the genetic algorithm is used to optimize the distributions of the interface position. The feed plate of a certain antenna is optimized by the above method, with simulation and test validation. It is shown that the maximum pointing error due to the thermal deformation is as low as 0.0203°, thus the requirement of the beam pointing deviation of not more than 0.025° can be met.