陶瓷基超材料雷达-红外多波段复合变频设计与主动隐身机理

高超声速飞行器隐身技术是提高飞行器作战效能的重要手段。传统的外形结构隐身和材料涂层隐身高效易用已经发挥出巨大的优势，但外形隐身影响气动布局牺牲有效搭载；涂料隐身频带窄且固定、适应性差，属于一种被动的隐身方式。随着现代探测器技术的智能化、多样化和复合化的发展趋势，本项目提出结合陶瓷基超材料电磁设计灵活性与3D打印结构制造灵活性获得雷达红外多波段变频带、变频宽和变频强的复合变频设计实现主动隐身，满足变频探测条件下高超声速飞行器及发动机高温目标的雷达红外兼容隐身需求。研究宏观打印谐振结构单胞参数、周期排布及复合方式对陶瓷基超材料电磁特性的影响规律；研究打印体微结构成分调控的红外辐射传输及谐振干涉机制对陶瓷基超材料表面界面红外辐射性能的影响规律；揭示陶瓷基超材料梯度复合结构设计实现雷达红外变频特性的主动隐身机理。该研究有助于丰富材料雷达红外兼容隐身理论，为发展多波段主动隐身超材料提供理论支持。

Stealth technology of hypersonic aerocraft is an important method to improve the combat effectiveness. The conventional shape stealth design and stealth coating are highly effective and easy-to-use, which has exhibited huge advantages. Nevertheless, shape stealth design goes against the aerodynamic layout and reduces the effective loading, and stealth coating has poor adaptability with the narrow and fixed absorbing frequency band, which is a passive stealth method. With the development trend of intelligence, diversification and compounding of modern detection technology, here we propose to combine the flexible electromagnetic designability of metamaterials with the fabrication flexibility of 3D printing technology to obtain the radar-infrared compatible multiband-tunable active stealth characteristics, with the tunable frequency band, bandwidth, and intensity, which satisfies radar-infrared compatible stealth requirements of high temperature targets such as hypersonic aerocraft and aero-engine under the condition of frequency conversion detection. Main researches are included as follows: study on the influence rule of the unit cell parameters, periodic arrangement and composite mode of the 3D-printed resonant structure on the electromagnetic characteristics of ceramic matrix metamaterials; study on the influence rule of the infrared radiation transmission mechanism and resonance interference mechanism controlled by the microstructure of 3D-printed substrate on the surface-interface infrared radiation performance of ceramic matrix metamaterials; study on the active stealth mechanism of ceramic matrix metamaterials gradient composite structure design realizing radar-infrared compatible multiband-tunable characteristics. The research is helpful to enrich the radar-infrared compatible stealth theory, and provides theoretical support for the development of multiband active stealth metamaterials.