【作者】 陈鑫； 屈劲； 余川；

【Author】 Chen Xin Qu Jin Yu Chuan (Laboratory for High Power Microwave Technique,Institute of Applied Electronics,CAEP,Mianyang 621900)

【机构】 中国工程物理研究院应用电子学研究所高功率微波技术实验室；

【摘要】 本文采用几何光学方法设计了一种偏馈双反射面天线。天线主反射面采用赋形设计,副反射面设计过程中采用Snell定理作为约束条件。通过理论公式推理、数值模拟仿真和实验测试研究,实现了一种出射波束口径为1.1米、天线口面场分布为抛物形分布、波束出射方向与竖直方向成20°夹角的赋形偏馈双反射面天线。在中心频率95GHz下,实测天线增益为59.7dB,第一副瓣电平为-19dB,天线口径效率达到78%。更多还原

【Abstract】 A shaped scheme based on geometric optics for offset fed dual_reflectors antenna is presented.A ray tube emerging from a symmetric feed horn is transformed,after reflections,into a circular beam with a uniform phased and a prescribed radial power distribution on the aperture.In the paper,Snell’s law was imposed on the subreflector. Based on this design solution,computer runs were taken for a 1.1m dish baseline system that the angle between X axis and the beam is 20 degrees.Theoretical analaysis,numerical simulation and experimental result were carried out. The experiment shows that at 95GHz,the antenna has a 78%aperture efficiency and the minor lobe meets a -19dB criterion and the gain is 59.7dB.更多还原