有限扫描反射面天线纵向偏焦性能的研究  

Study on longitudinal defocus performance of finite scan reflector antenna

作　　者：范黄江 叶文熙 李正军[1] FAN Huangjiang;YE Wenxi;LI Zhengjun(China Academy of Space Technology(Xi’an),Xi’an 710000,China)

机构地区：[1]中国空间技术研究院西安分院,西安710000

出　　处：《空间电子技术》2022年第3期84-89,共6页Space Electronic Technology

摘　　要：随着相控阵天线的不断发展,有限扫描反射面天线已经成为当前的研究热点,为了符合新时代天线多功能的需求,提出一种基于抛物面形变的纵向偏焦特性。设计一个标准正馈反射面天线,使其馈源固定不动,而利用调节反射面焦距来达成天线的偏焦,其偏焦特性类似于抛物面天线的纵向偏焦特性;设计一个双焦点反射面,由XOZ平面抛物线和YOZ平面抛物线正交互异设计双焦点反射面天线,令YOZ平面抛物线焦点外推、XOZ平面抛物线焦点不变构成一个双焦点反射面。验证了该方法在一维阵列作为馈源的有效性,双焦点反射面相较于标准抛物面,在EL方向上该天线增益上升了14.29 dB,且波束宽度基本不变;此外,该方法还能容纳所有馈源同时工作,降低了单个馈源喇叭的功率且增益相较于点波束天线只下降了4.85 dB。该方法将为后续有限扫描反射面天线在设计一维扫描或二维不等范围扫描提供理论支撑。With the development of phased array antennas,the finite scanning reflector antenna has become a hot research area.In order to meet the multi-function requirements of antennas in the new era,a longitudinal defocus characteristic based on parabolic deformation is proposed in this paper.A standard feed-forward reflector antenna is designed to make its feed fixed,and the defocus of the antenna is achieved by adjusting the focal length of the reflector,which is similar to the longitudinal defocus of parabolic antenna.A bifocal reflector is designed,and a bifocal reflector antenna is designed by the positive interaction of XOZ plane parabola and YOZ plane parabola,so that the focus of YOZ plane parabola is extrapolated and the focus of XOZ plane parabola remains unchanged to form a bifocal reflector.In this paper,the effectiveness of the proposed method is verified in one-dimensional arrays.The gain of the antenna increases by 14.29 dB in the EL direction compared with that of the standard parabola,and the beam width is basically unchanged.In addition,the proposed method can accommodate all feeders working simultaneously,and the power of a single feed horn is reduced and the gain is only 4.85 dB lower than that of a spot-beam antenna.This method will provide theoretical support for the design of one-dimensional scan or two-dimensional unequal range scan of finite scanning reflector antenna.

关 键 词：有限扫描 反射面天线 纵向偏焦 

分 类 号：V443[航空宇航科学与技术—飞行器设计]