Multi-objective optimal design for flexible bio-inspired meta-structure with ultra-broadband microwave absorption and thin thickness  

作　　者：Mengfei FENG Shenyao LIU Hui CHENG Kaifu ZHANG Yuan LI Guanjie YU Bo LIU Biao LIANG 

机构地区：[1]School of Mechanical Engineering,Northwestern Polytechnical University,Xi’an 710072,China [2]The Key Laboratory of Aircraft High Performance Assembly,Ministry of Industry and Information Technology,Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Chinese Journal of Aeronautics》2025年第3期151-162,共12页中国航空学报(英文版)

基　　金：supported by the Basic Research Development Program of China(No.JCKY2021607B036);the National Natural Science Foundation of China(No.52275512).

摘　　要：There is an urgent need for the application of broadband Microwave Absorption(MA)structures on the leading edges of aircraft wings,which requires the MA structures to possess both the broadband MA performance and great surface conformability.To meet these requirements,we designed and fabricated a flexible bioinspired meta-structure with ultra-broadband MA,thin thickness and excellent surface conformality.The carbonyl iron powder-carbon nanotubes-polydimethylsiloxane composite was synthesized by physical blending method for fabricating the MA meta-structure.Through geometry-electromagnetic optimal design by heuristic optimization algorithm,the meta-structure mimicking to the nipple photonic nanostructures on the eyes of moth can achieve ultra-broadband MA performance of 35.14 GHz MA bandwidth(reflection loss≤–10 dB),covering 4.86–40.00 GHz,with thickness of only 4.3 mm.Through simple fabrication processes,the meta-structure has been successfully fabricated and bonded on wings’leading edges,exhibiting excellent surface conformability.Furthermore,the designed flexible MA meta-structure possesses significant Radar Cross-Section(RCS)reduction capability,as demonstrated by the RCS analysis of an unmanned aerial vehicle.This flexible ultra-broadband MA meta-structure provides an outstanding candidate to meet the radar stealth requirement of variable curvature structures on aircraft.

关 键 词：Broadband microwave absorption Surface conformability Flexible meta-structure BIO-INSPIRED Electromagnetic Radar cross section 

分 类 号：TB34[一般工业技术—材料科学与工程]