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首页> 外文期刊>Acta astronautica >Electromagnetic characterization of advanced nanostructured materials and multilayer design optimization for metrological and low radar observability applications
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Electromagnetic characterization of advanced nanostructured materials and multilayer design optimization for metrological and low radar observability applications

机译:先进的纳米结构材料的电磁特性和用于计量学和低雷达可观测性应用的多层设计优化

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摘要

In this work the electromagnetic characterization of composite materials reinforced with carbon and metallic nanoparticles is presented. In particular, the electric permittivity and the magnetic permeability as a function of the frequency are used to evaluate the electromagnetic absorption capability of the nanocomposites. The aim is the study of possible applications in advanced coaling able to tune the electromagnetic reflectivity of satellite surfaces in specific frequency ranges, in a special way for those surfaces that for some reason could be exposed to the antenna radiation pattern. In fact, the interference caused by the spurious electromagnetic multipath due to good electric conductive satellite surface components could in turn affect the main radiation lobe of TLC and Telemetry antennas, thus modifying its main propagation directions and finally increasing the microwave channel pathloss. The work reports the analysis of different nanostructured materials in the 2-10 GHz frequency range. The employed nanopowders are of carbon nanotubes, cobalt, argent, titanium, nickel, zinc, copper, iron, boron, bismuth, hafnium, in different weight percentages versus the hosting polymeric matrix. The materials are classified as a function of their electromagnetic losses capability by taking into account of both electric and magnetic properties. The possibility to design multi-layered structures optimized to provide specific microwave response is finally analyzed by the aid of swam intelligence algorithm. This novel technique is in general interesting for metrological purpose and remote sensing purposes, and can be effectively used in aerospace field for frequency selective materials design, in order to reduce the aircraft/spacecraft radar observability at certain frequencies.
机译:在这项工作中,介绍了用碳和金属纳米颗粒增强的复合材料的电磁特性。特别地,将介电常数和磁导率作为频率的函数用于评估纳米复合材料的电磁吸收能力。目的是研究能够以特定方式对由于某种原因而可能暴露于天线辐射图的那些表面以特殊方式调谐卫星表面在特定频率范围内的电磁反射率的高级煤层中的可能应用。实际上,由于良好的导电卫星表面组件而导致的杂散电磁多径干扰可能反过来影响TLC和遥测天线的主辐射波瓣,从而改变了其主传播方向,并最终增加了微波信道的路径损耗。这项工作报告了在2-10 GHz频率范围内对不同纳米结构材料的分析。相对于主体聚合物基质,所使用的纳米粉为碳纳米管,钴,银,钛,镍,锌,铜,铁,硼,铋,ha的重量百分比不同。考虑到电和磁特性,将这些材料根据其电磁损耗能力进行分类。最后借助游泳智能算法分析了设计优化以提供特定微波响应的多层结构的可能性。这项新颖的技术通常对于计量目的和遥感目的而言是令人感兴趣的,并且可以有效地用于航空航天领域中的频率选择材料设计,从而降低飞机/航天器雷达在某些频率下的可观察性。

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