Inversion of Defect’s dimension in the Manufacturing Process of Conformal Load-bearing Antenna Structure

doi:10.3901/JME.2016.10.158

Abstract

Abstract: 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 dB in amplitude and ±5° in phase. The precision of the novel inversion can satisfied the requirements in engineering.

Key words: conformal load-bearing antenna structure, error analysis, far field, inversion, manufacturing defects

CLC Number:

TH161

LI Peng, XU Wangye, WANG Shuangfei. Inversion of Defect’s dimension in the Manufacturing Process of Conformal Load-bearing Antenna Structure[J]. Journal of Mechanical Engineering, 2016, 52(10): 158-165.

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