多维度磁谐振诱导的电磁波透明及其在大曲率隐身天线罩设计中的应用研究

Dealing with the compelling application demands for stealthy head radomes of aircrafts, this project will carry out investigations on multi-dimensional magnetic resonance-induced electromagnetic transparency as well as on its applications in the design of large-curvature stealthy radomes, with the aim to overcome the bottleneck problem in the design and realization of wide-angle broadband frequency selective surfaces. The mechanism of multi-dimensional magnetic resonance-induced electromagnetic transparency will be firstly investigated using the effective medium theory of metamaterials to illustrate the influences of resonance strength, bandwidth and loss on the impedance matching property. On this basis, theoretical model of multi-dimensional magnetic resonance-induced electromagnetic transparency will be established. Then, the design of multi-dimensional magnetic resonance structures will be investigated on the basis of metamaterial design theory. Meanwhile, investigations on the design and performance optimization of broadband band-pass frequency selective surfaces will be also carried out for the purpose of developing large incidence-angle broadband frequency selective surfaces. Finally, effects of curvature and shape on the frequency selective property will be formulated. On this basis, we will design, bricate proof-of-principle samples of large-curvature stealthy radomes and measure, evaluate their performances.

大入射角宽频带频率选择表面（FSS）设计成为头锥型隐身天线罩设计的技术瓶颈。项目提出基于多维度磁谐振诱导的电磁波透明实现大入射角宽频带FSS的思想，致力于多维度磁谐振诱导的电磁波透明机理和滤波机制研究，突破大入射角宽频带FSS设计的技术瓶颈，在此基础上开展头锥型隐身天线罩设计技术研究。首先采用超材料等效介质理论研究多维度磁谐振诱导的电磁波透明机理，阐明磁谐振强度、带宽、损耗等对阻抗匹配特性的影响；其次基于超材料设计理论开展多维度小型化磁谐振结构设计研究，并应用到FSS设计和性能优化，研制出大入射角宽频带FSS；最后研究天线罩曲率、外形等对FSS频率选择特性的影响，并据此进行综合优化设计，研制出头锥型隐身天线罩原理样件，测试并评价其性能。通过本项目研究，可望阐明基于多维度磁谐振的电磁透明机理和滤波机制，最终建立大入射角频率选择表面的一般设计理论和应用设计方法，为研制头锥型隐身天线罩提供理论支

天线罩隐身是决定装备是否隐身的关键因素。大入射角宽带带通频率选择表面的设计是现有装备中头锥型隐身天线罩设计的技术瓶颈。现有二维频选隐身天线罩单一满足大入射角稳定性要求。本项目提出了基于多维度磁谐振诱导的电磁波透明实现大入射角宽频带频率选择表面的设计思想。四年来，完成了多维度磁谐振诱导的电磁波透明机理和滤波机制研究，基于人工表面等离激元的设计技术，突破了大入射角宽频带频率选择表面的设计技术瓶颈。提出了一种基于SSPP模式的多通带频率选择结构设计方法：将传统FSS加载到金属鱼骨结构阵列上。FSS的作用是调制金属鱼骨结构阵列的通带特性。基于这种设计方法，实现了具有高透高抑制性能的双通带频率选择结构和三通带频率选择结构。基于超材料等效媒质理论，设计了多维度小型化频率选择表面设计，应用到全介质频率选择表面的设计中，实现了大入射角度小的全介质频率选择表面。探究了曲面天线罩的设计方法和设计技术，仿真设计了一种低通高阻，全角域宽频带隐身天线罩，并通过加工制备实验样件，完成了实验验证。