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Gradient honeycomb metastructure with broadband microwave absorption and effective mechanical resistance

Nano Materials Science 2024年第4期6卷 456-466页

作者： Dongmeng Li Xia Zheng Hao Gu Xiaobo Xuan Bing Liu Hongquan Feng Fuheng Zhang Shanghai Radio Equipment Research Institute Shanghai 200438People's Republic of China

Multifunctional metastructure integrated broadband microwave absorption and effective mechanical resistance has attracted much ***,multifunctional performance is limited by the lack of theoretical approaches to integrated ***,a multi-layer impedance gradient honeycomb(MIGH)was designed through theoretical analysis and simulation calculation,and fabricated using 3D printing technique.A theoretical calculation strategy for impedance gradient structure was established based on the electromagnetic parameter equivalent method and the multi-layer finite iterative *** impedance of MIGH was analyzed by the theoretical calculation strategy to resolve the broadband *** loss mechanism of matrix materials and distributions of electric fields,magnetic fields and power loss were analyzed to investigate the absorption *** results indicated that a 15 mm thick designed metastructure can achieve the absorption more than 88.9%in the frequency range of 2-18 ***,equivalent mechanical parameters of MIGH was calculated by integral method according to the Y-shaped *** Element analysis of stress distributions were carried out to predict the deformation *** tests demonstrate that MIGH achieved the compression modulus of 22.89 MPa and flexure modulus of 17.05 *** integration of broadband electromagnetic absorption and effective mechanical resistance was achieved by the proposed design principle and fabrication methodology.

关键词： Multifunctional metastructure broadband microwave absorption Impedance gradient calculation Mechanical characteristics Finite element analysis

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From intrinsic dielectric loss to geometry patterns: Dual-principles strategy for ultrabroad band microwave absorption

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Nano Research 2021年第5期14卷 1495-1501页

作者： Bin Quan Weihua Gu Jiaqi Sheng Xinfeng Lv Yuyi Mao Lie Liu Xiaogu Huang Zongjun Tian Guangbin Ji College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing210016China School of Chemistry and Materials Science Nanjing University of Information Science&TechnologyNanjing210044China National Center of Supervision and Inspection on Additive Manufacturing Products Quality Wuxi214000China Shenzhen General Test Systems Inc Taohuayuan Hi-Tech ParkShenzhen518102China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing210016China

As electromagnetic absorbers with wide absorption bandwidth are highly pursued in the cutting-edge electronic and telecommunication industries, the traditional dielectric or magnetic bulky absorbers remain concerns of extending the effective absorption bandwidth. In this work, a dual-principle strategy has been proposed to make a better understanding of the impact of utilizing conductive absorption fillers coupled with implementing artificial structures design on the absorption performance. In the comparison based on the microscopic studies, the carbon nanotubes (CNTs)-based absorbers are confined to narrow operating bandwidth and relatively fixed response frequency range, which can not fulfill the ever-growing demands in the application. With subsequent macroscopic structure design based on the CNTs-based dielectric fillers, the artificial patterns show much more broadened absorption bandwidth, covering the majority of C-band, the whole X-band, and Ku-band, due to the tailored electromagnetic parameters and more reflections and scatterings. The results suggest that the combination of developing microscopic powder/bulky absorbers and macroscopic configuration design will fundamentally extend the effective operating bandwidth of microwave.

关键词： geometry patterns numerical simulation three-dimensional(3D)printing broadband microwave absorption

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Pushing the limits of microwave absorption capability of carbon fiber in fabric design based on genetic algorithm

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Journal of Advanced Ceramics 2023年第2期12卷 329-340页

作者： Yuhao LIU Xiaoxiao HUANG Xu YAN Long XIA Tao ZHANG Jiahao SUN Yanan LIU Yu ZHOU State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Beijing Institute of Radio Measurement China Aerospace Science and Industry Corporation LimitedBeijing 100854China School of Materials Science and Engineering Harbin Institute of TechnologyWeihaiWeihai 264209China

The field of electromagnetic wave absorption(EWA)requires the adaptability,tenability,and multifunction of high-performance materials in the *** design and preparation of EWA materials aiming at performance requirements is the latest research ***,a performancedriven strategy for simultaneously coordinating different target performances was proposed to optimize the structure of the periodical long continuous carbon/glass fiber fabric(PCGF)materials through algorithm and *** optimized structure of the PCGF not only improves the impedance matching,but also introduces the induced orientation effect for a high cooperative loss of conductivity,resonance,and periodic *** flexible PCGF shows a broad effective absorption bandwidth(EAB)of 32.7 GHz covering a part of the C-band and the whole X-,Ku-,K-,and Ka-bands with a thickness(d)of only 0.92 mm and a density of 5.6×10^(−4) kg·cm^(−3).This highly designable fabric is promising for the EWA practical application owing to integrating the characteristics of good flexibility,acid and alkali resistance,bending resistance,excellent mechanical properties,and easy large-scale preparation.

关键词： broadband microwave absorption carbon fiber impedance matching periodical long continuous carbon/glass fiber fabric(PCGF) multiple loss mechanism

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Nanoarchitectonics of MnO_(2)nanotubes as sea urchin-like aggregates for dielectric response and microwave absorption with a wide concentration domain

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Nano Research 2023年第2期16卷 2604-2610页

作者： Zhi-Ling Hou Kunrong Du Yiqin Zhang Song Bi Junying Zhang College of Mathematics and Physics&Beijing Key Laboratory of Environmentally Harmful Chemical Analysis Beijing University of Chemical TechnologyBeijing 100029China 501 Department Xi’an Research Institute of High-TechXi’an 710025China

Designing highly reliable and practical microwave absorbers is one of the most important research directions in the microwave absorbing *** absorbents suffer from concentration-sensitivity and environmental-sensitivity dilemmas in practical ***,sea urchin-like aggregates of MnO_(2)nanotubes were synthesized by a simple hydrothermal method,which exhibit an outstanding impedance matching *** composites based on sea urchin-like aggregates of MnO_(2)nanotubes show excellent microwave absorption performance in a wide concentration domain from 20 wt.%to 70 wt.%,corresponding to electrical conductivities from 1.86×10^(−7)to 1.85×10^(−5)S/*** a wide concentration range of absorbent for excellent microwave absorption is mainly attributed to the beneficial impedance matching properties of sea urchin-like aggregates of hollow nanotubes.A competitive absorption bandwidth of 3.36 GHz is achieved at 1 mm thickness,which can be broadened to 13.4 GHz by structural *** work shows a new scheme for designing reliable and practical microwave absorbers benefit from the wide absorbent concentration domain.

关键词： MnO_(2)nanotubes sea urchin-like aggregates broadband microwave absorption wide filling range

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