中文摘要：

共形承载天线（Conformal load-bearing antenna structure,CLAS）将微带天线和防护结构封装为一体,是一种可安装于飞行器外蒙皮的新型天线结构。针对封装过程中防护罩体内存在空腔、气泡等制造缺陷,根据透射理论和射线追踪-表面积分方法,提出一种由天线远场特性反演缺陷几何特征的方法。推导出远场到罩体透射系数以及透射系数到罩体材料厚度的两个反演公式,两者结合可实现由测量远场到罩体缺陷几何特征的反演,并进一步推广至多层罩体。通过一个12.5 GHz的4单元共形承载天线进行数值仿真试验,仿真结果表明反演模型理论精度高,有效性好。基于该算例,对所提出的反演模型进行误差分析,分析结果表明当远场测量精度满足幅度误差小于0.45 d B,相位误差小于±5°时,反演结果的误差小于10%,该精度完全可以满足工程使用的精度要求。

英文摘要：

The conformal load-bearing antenna structure（CLAS） is a new multidisciplinary concept of aircraft structure, in which a microstrip antenna is layered into a composite structure. For the manufacturing defects in the packaging of the microstrip antenna and the composite material radome, a novel inversion of the defects＇ dimension by CLAS＇s far field is presented based on transmission theory and ray tracing-surface integral approach. Two inversion formulas are derived, one is the inversion from the far filed data to the transmission coefficient of the radome, the other is from the transmission coefficient to the dimension of the defect. The combination of the two formulas could realize the inversion from the far field data to the defects＇ dimension. The formula for multilayered radome is also presented. A 12.5 GHz CLAS with 4 microstrip antenna elements is used in the simulation experiment. The results of the simulation show that the retrieval method has good precision and validity. Finally, based on the simulation, the error of the retrieval method is analyzed, which shows that the error of the retrieval method is less than 10%, if the measurement error of far field is less than 0.45 d B in amplitude and ±5° in phase. The precision of the novel inversion can satisfied the requirements in engineering.