金属桁架式天线罩结构变形对系统电性能的影响  

Electrical Performance Analysis of Metal Space Frame Radome with Structural Deformation

作　　者：许万业[1] 李鹏[1] 仇原鹰[1] 林占超[1] 

机构地区：[1]西安电子科技大学电子装备结构设计教育部重点实验室,西安710071

出　　处：《机械工程学报》2016年第1期57-63,共7页Journal of Mechanical Engineering

基　　金：国家重点基础研究发展计划(973计划;2015CB857100);国家自然科学基金(51490660;51475348);中央高校基本科研业务费专项资金资助项目

摘　　要：针对金属桁架式天线罩在载荷下的结构变形对系统电性能影响的问题,分析天线罩在载荷作用下的变形,针对变形的蒙皮和桁架,将天线电磁波透过蒙皮后的透射场与桁架产生的散射场相叠加,得到变形罩体下的天线远场,在此基础上分析变形天线罩对系统电性能的影响。通过某20 m金属桁架式天线罩进行数值仿真,结果表明变形对系统电性能的影响显著,且罩体的厚度越大、频率越高,变形引入的影响越大,在此基础上分析天线罩结构变形对系统电性能的影响机理,指出较大变形下系统电性能没有剧烈变化的原因,并提出可以真实反映电性能变化程度的天线罩变形描述方法。The effect of structural deformation on the electrical performance of metal space frame （MSF） radome is studied. The structural deformation of the radome under the impact of external loads is analyzed. The far field of antenna is obtained by adding the far field transmitted through skin to the scattering field generated by frame. The effect of the deformed radome on electrical performance is analyzed. The simulation results of some 20 m MSF radome indicate that structural deformation can degrade the electrical performance, and the degradations increase with the radome depth and the working frequency. The influence mechanism of structural deformation of radome on electrical performance is studied and the reason why a large deformation does not degrade the electrical performance greatly is given. A novel method for describing the deformation is presented to accurately estimate the effect of structural deformation on electrical performance.

关 键 词：天线罩 金属桁架 介质夹层 结构变形 电性能 

分 类 号：TN957[电子电信—信号与信息处理]