羽流对卫星反射面天线辐射特性的扰动分析  

Analysis of satellite reflector antenna radiation characteristics perturbed by plume

作　　者：尹伟科[1,2] 魏兵[1,2] 

机构地区：[1]西安电子科技大学物理与光电工程学院,陕西西安710071 [2]西安电子科技大学信息感知技术协同创新中心,陕西西安710071

出　　处：《西安电子科技大学学报》2017年第4期24-28,61,共6页Journal of Xidian University

基　　金：中央高校基本科研业务费资助项目(JB160512);国家自然科学基金资助项目(61571348)

摘　　要：相比化学推进,电推进具有比冲高和燃料消耗少的优点,可大幅度提高卫星的机动性和寿命.但由于等离子体对电磁波的吸收和折射效应,电磁波通过等离子体时将会衰减.文中利用射线追踪、口径积分和场强叠加原理,分析等离子体羽流对卫星反射面天线远场辐射方向图的影响,计算了羽流对2~5GHz频段电磁波的衰减.与实验数据进行对比表明,对于20cm等离子体推进器,在2~5GHz天线工作频段,主瓣峰值衰减为0.3~2.5dB;在E平面,天线主瓣偏离天线轴向小于0.5°.The electric thruster has the advantage of high specific impulses and requiring much less fuel compared with the chemical thruster, and it will improve the mobility and life span of a satellite. Electromagnetic waves will be attenuated in the plasma plume because of absorption and refraction effects. In this paper, Ray tracing, aperture integral and the superposition principle of the electric field are used to analyze the effects of the plasma plume on antenna performance. The attenuation of the plume between 2 GHz and 5 GHz frequencies are calculated. For a 20 cm electric thruster plume, simulation results vary from 0.3 dB to 2.5 dB compared with the experimental data, and the angle of the main lobe bending away from the thruster is less than 0.5 degree for the E-plane pattern.

关 键 词：等离子体 三维射线追踪 极化 衰减 

分 类 号：TN827.9[电子电信—信息与通信工程]