星载超轻索膜SAR天线结构设计与分析  

DESIGN AND ANALYSIS FOR ULTRA-LIGHT CABLE-MEMBRANE SAR ANTENNA ON SATELLITE

作　　者：李岩咏 韦娟芳[1] 冯勃[2] 刘宇飞[3] LI Yanyong;WEI Juanfang;FENG Bo;LIU Yufei(Spatial Structure Research Center,Zhejiang University,Hangzhou 310058,China;State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi’an Jiaotong University,Xi’an 710049,China;Qian Xuesen Laboratory of Space Technology,Beijing 100094,China)

机构地区：[1]浙江大学空间结构研究中心,杭州310058 [2]西安交通大学机械结构强度与振动国家重点实验室,西安710049 [3]中国空间技术研究院钱学森空间技术实验室,北京100094

出　　处：《低温建筑技术》2019年第10期75-79,88,共6页Low Temperature Architecture Technology

摘　　要：针对传统高频合成孔径雷达(SAR)天线质量大,而轻量化的薄膜微带阵天线因热变形大无法应用于高频段的问题,提出了一种超轻型索膜微带相控阵天线结构。该天线结构包括顶层、地平层、索网、泡沫柱及馈电系统,利用凯夫拉(Kevlar)纤维热膨胀系数为负的特性,将Kevlar索网附加在薄膜上从而降低天线热变形。利用Patran/Nastran软件分析了天线结构在极端高、低温环境下的热变形,并且对泡沫柱尺寸、索网布置形式及截面尺寸、膜厚度等结构参数进行优化分析;利用ANSYS软件的对天线进行了电性能仿真,得到了使质量及热变形最优的天线结构参数。该天线结构具有质量轻、精度高的优点,可应用于高频段SAR天线。The weight of traditional synthetic aperture radar(SAR)antennas is high,however the light-weight thin-membrane micro-strip array antennas cannot be applied to high frequency band antennas due to the large thermal deformation.Therefore,in order to solve this problem,a ultra-light cable-membrane micro-strip phase array antenna structure is proposed in this work.This antenna structure include top layer、ground、Kevlar woven-strip、foam column and feed network.The negative thermal expansion coefficient of Kevlar fiber was utilized to reduce the thermal deformation by attaching the Kevlar cable to the membrane.The thermal deformation of the antenna structure in extreme high and low temperature environments were analyzed by using Patran/Nastran,and moreover,some geometric parameters of the structure were optimally selected,including diameter of foam column,cable layout and section size,film thickness.The electrical performance of the antenna was checked by ANASYS.Finally,the optimal parameters with minimum mass and thermal deformation for the antenna structure were obtained.With the merits of light weight and high precision,this antenna structure can be applied to a SAR antenna in high frequency band.

关 键 词：索膜微带相控阵天线 结构优化 热变形 轻量化 

分 类 号：TU356[建筑科学—结构工程]