有限扫描反射面天线相控波束重构技术

该文研究一种采用聚焦馈源阵列馈电的反射面天线，相控阵馈源离开焦平面向反射面移动一定距离，位于焦散区，能够增强反射面天线的波束重构赋形能力和有限视角扫描能力。采用改进的投影矩阵法，利用仅相位控制技术，求解相控阵馈源的激励系数，有效综合了聚焦馈源偏置抛物面天线的方向图。对算例的设计达到了采用仅相位技术控制波束指向、波束赋形、旁瓣电平等性能要求，实现了相控阵馈电偏置抛物面天线的波束重构或扫描，并利用商用GRASP仿真软件验证了该文的设计结果，说明了该文方法的有效性。

Beam Reconfiguring Technique for Limited Angle Scanning Reflector Antenna with Phase-only Control

Reflector antenna with defocused array feed is investigated.The phased array feed moves towards the reflector and locates at the defocused area,which can enhance the beam reconfiguring ability and limited angle scanning capability.Improved projection matrix algorithm is adopted to get the excitation coefficients of the feeding phased array under phase-only control constraint.A numerical analysis is carried out in order to demonstrate the effectiveness of the approach.The patterns of the offset parabolic antenna fed by defocused feed array are effectively synthesized,including scanning and reconfigurable beams.The beam direction,beam-shape and side-lobe level requirements are met under phase-only control.The design results are verified by the simulation software GRASP.