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performance and electromagnetic mechanism of radar-and infraredcompatible stealth materials based on photonic crystals

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International Journal of Minerals,Metallurgy and Materials 2025年第3期32卷 710-717页

作者： Yanming Liu Xuan Yang Lixin Xuan Weiwei Men Xiao Wu Yuping Duan AVIC Research Institute for Special Structures of Aeronautical Composite Ji’nan 250023China Aviation Key Lab of Science and Technology on High Performance Electromagnetic Windows Ji’nan 250023China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116085China

Traditional stealth materials do not fulfill the requirements of high absorption for radar waves and low emissivity for infrared ***,they can be detected by various technologies,considerably threatening weapon ***,a stealth material compatible with radar and infrared was designed based on the photonic bandgap characteristics of photonic *** radar stealth lay-er(bottom layer)is a composite of carbonyl iron/silicon dioxide/epoxy resin,and the infrared stealth layer(top layer)is a 1D photonic crystal with alternately and periodically stacked germanium and silicon *** composition optimization and structural adjust-ment,the effective absorption bandwidth of the compatible stealth material with a reflection loss of less than-10 dB has reached 4.95 *** average infrared emissivity of the proposed design is 0.1063,indicating good stealth *** theoretical analysis proves that photonic crystals with this structural design can produce infrared waves within the photonic bandgap,achieving high radar wave transmittance and low infrared *** stealth is achieved without affecting the absorption performance of the radar stealth layer,and the conflict between radar and infrared stealth performance is *** work aims to promote the application of photonic crystals in compatible stealth materials and the development of stealth technology and to provide a design and theoretical found-ation for related experiments and research.

关键词： microwave absorption infrared stealth photonic crystal compatible stealth

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Mechanical skin pain and comfort evaluation model applied to skin-integrated electronics

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International Journal of Solids and Structures 2025年 318卷

作者： Zhu, Yunfan Ji, Dongcan Wang, Yang Li, Yuhang Li, Min Chen, Jiayun Ma, Yinji Beijing100191 China Ningbo Innovation Institute Beihang University Ningbo315800 China International innovation institute Beihang University Hangzhou310023 China State Key Laboratory of Flexible Electronics Technology Tsinghua University Beijing100084 China AML Department of Engineering Mechanics Tsinghua University Beijing100084 China AVIC Research Institute for Special Structures of Aeronautical Composites Innovation Center for Electromagnetic Functional Structure Aviation Key Lab of Science and Technology on High Performance Electromagnetic Windows Shandong Ji'nan250023 China

Skin-integrated electronics have received significant attention in medical and health monitoring. Due to improper usage or design, skin pains and discomfort tend to occur in users of skin-integrated electronics, particularly in patients with nervous system damage. This paper presented a theoretical model for evaluating the skin pain and comfort of skin-integrated electronics, based on the physiological process of human pain perception. Additionally, the impact of glial cell reduction on pain caused by damage to the nervous system was analyzed. The simulations were carried out to analyze the skin pain sensation under three different mechanical stimuli from typical skin-integrated electronics, which included: mechanics model of multilayer skin, nerve signal transduction based on Hodgkin-Huxley model, transmission and perception rooted in gate control theory. The stress distribution demonstrated by finite element analysis on the multilayer skin was produced using the viscoelasticity theory. Among three different mechanical stimuli from typical skin-integrated electronics, the numerical experiments obtained the appropriate load for rapid pain response and comfort design, respectively. Furthermore, factors influence the skin pain perception were discussed including skin thickness and number of glial cells, which could contribute to the design of skin-integrated electronics in medical applications. © 2025 Elsevier Ltd

关键词： Physiological models

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Mechanical Behavior and Microstructure Characterization of 3D Stitched Quartz Fibers-reinforced Silica Composites

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Journal of Wuhan University of technology(Materials science) 2014年第1期29卷 5-8页

作者：轩立新 LIU Yong 陈照峰 College of Material Science & Technology Nanjing University of Aeronautics and Astronautics Aviation Key Laboratory of Science and Technology for High Performance Electromagnetic Windows

The mechanical properties of silica material in the monolithic form are ;far from acceptable levels. In this paper, 3D stitched quartz preform was used for the fiber reinforcement, and quartz fibers- reinforced silica composites were prepared by the silica sol-infiltration-sintering method. The density of the composite was up to 1.71 g/cm3 after 10 infiltration-sintering cycles. The flexural strength and the in-plane shear strength were 61.7 MPa and 20.3 MPa, respectively. The flexural stress-deflection curve exhibited mostly nonlinear behavior, which was different from that of monolithic ceramics. Because of the existence of the fiber in Z axis direction, shearing property between the different layers of 3D stitched composites were greatly enhanced. Toughness effect of the 3D stitched quartz preform was conspicuous. The as-fabricated composites showed non-catastronhic failure behavior resulting from weak fiber/matrix interface.

关键词： 3D stitched preform ceramic matrix composites microstructure mechanical behavior

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A novel polarization converter based on the band-stop frequency selective surface

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Chinese Physics B 2022年第2期31卷 380-386页

作者： Kun Liao Shining Sun Xinyuan Zheng Xianxian Shao Xiangkun Kong Shaobin Liu College of Electronic and Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Aviation Key Laboratory of Science and Technology on High Performance Electromagnetic Windows Jinan 250023China Pingxiang Health Vocational College Pingxiang 337006China

A dual-passband single-polarized converter based on the band-stop frequency selective surface(FSS)with a low radar cross-section(RCS)is designed in this *** unit cell of the proposed converter is formed by a polarization layer attached to the band-stop frequency selective *** simulation results reveal that the co-polarization reflection coefficients below-10 d B are achieved in 3.82–13.64 GHz with a 112.4%fractional bandwidth(the ratio of the signal bandwidth to the central frequency).Meanwhile,a polarization conversion band is realized from 8.14 GHz to 9.27 GHz with a polarization conversion ratio which is over 80%.Moreover,the 1 d B transmission window is obtained in two nonadjacent bands of 3.42–7.02 GHz and 10.04–13.91 GHz corresponding to the relative bandwidths of 68.9%and 32.3%,***,the radar cross-section of the designed structure can be reduced in the wideband from 2.28 GHz to 14 GHz,and the 10 d B RCS reduction in the range of 4.10–13.35 GHz is *** addition,the equivalent circuit model of this converter is established,and the simulation results of the Advanced Design System(ADS)match well with those of CST Microwave Studio(CST).The archetype of the designed converter is manufactured and *** experiment results match the simulation results well,which proves the reliability of the simulation results.

关键词： dual-passband single-polarized converter polarization radar cross-section(RCS)

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Radiation-Stealth Integrated Antenna Structure Based on FSR

Radiation-Stealth Integrated Antenna Structure Based on FSR

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2024 International Applied Computational electromagnetics Society Symposium, ACES-China 2024

作者： Li, Kai Liu, Peng Zhou, Guangyong Pang, Xiaoyu Aviation Key Lab of Science and Technology on High Performance Electromagnetic Windows AVIC Research Institute for Special Structures of Aeronautical Composites Tsinan China

ISBN: (纸本)9798350355581

This article proposes a radiation-stealth integrated antenna structure based on an FSR (Frequency Selective Rasorber) structure. When the antenna is operational, this structure functions as a normal radiator;however, when it is inactive, the entire system becomes a broadband absorber. Simulation results indicate that the structure exhibits a VSWR © 2024 IEEE.

关键词： Microwave antennas

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Low Profile electromagnetic Functional Metasurfaces with Passband Switchable Function

Low Profile Electromagnetic Functional Metasurfaces with Pas...

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2024 International Applied Computational electromagnetics Society Symposium, ACES-China 2024

作者： Shi, Min Li, Mengyuan Zhang, Qingdong Pang, Xiaoyu Aviation Key Lab of Science and Technology on High Performance Electromagnetic Windows AVIC Research Institute for Special Structures of Aeronautical Composites Tsinan China

ISBN: (纸本)9798350355581

This paper proposes a multifunctional switching electromagnetic functional metasurfaces based on PIN diodes, which has the advantages of low profile and angular stability, and is suitable for fast switching in different passbands. By cascading a two-layer non resonant structure, it has a dual transmission passband (6.5-7.0 GHz and 11.9-12.8 GHz) in the "off state"and a single transmission passband (9.5-10.5 GHz) in the "open state". After simulation, both functions ensure a 70% transmittance (within a 45 ° incidence angle range) at a profile height of 1mm, and have a high cutoff state outside the passband. © 2024 IEEE.

关键词： PIN diodes

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Design of A Novel Frequency Selective Surface based on Three-Dimensional Structure

Design of A Novel Frequency Selective Surface based on Three...

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2024 International Applied Computational electromagnetics Society Symposium, ACES-China 2024

作者： Li, Mengyuan Wang, Bao Wang, Qian Pang, Xiaoyu Aviation Key Lab of Science and Technology on High Performance Electromagnetic Windows AVIC Research Institute for Special Structures of Aeronautical Composites Tsinan China

ISBN: (纸本)9798350355581

This paper proposes a novel frequency selective surface based on three-dimensional structure, which consists of the planar periodic hexagonal ring gap structure and three-dimensional structure with gas printed on it. The proposed structure can achieve switchable transparent/reflective states, and the transparent state can provide high transmittance and cutoff state outside the passband, it is advantageous for application in complex electromagnetic environment © 2024 IEEE.

关键词： Frequency selective surfaces

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A Dual-band Patch Antenna Fed with Coplanar L-Probe 12

A Dual-band Patch Antenna Fed with Coplanar L-Probe

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12th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2024

作者： Liu, Peng Zhao, Yinxue Li, Kai Gao, Di Pang, Xiaoyu Men, Weiwei Avic Research Institute for Special Structures of Aeronautical Composites Aviation Key Lab of Science and Technology on High Performance Electromagnetic Windows Tsinan China

ISBN: (纸本)9798350351019

This paper designs a dual-band microstrip patch antenna fed by a coplanar L-probe. This antenna contains a rectangle patch, two parasitic patches, and a coplanar gradient L-probe. The L probe coupled the rectangle patch, achieving impedance matching in the lower band. The parasitic patch can produce impedance matching in the upper band. The antenna shows the -10 dB impedance bandwidths in 5.31 ∼ 6.33GHz and 6.98 ∼ 7.56GHz through coplanar coupling design of three structures. And the antenna has good radiation patterns in the dual-band. © 2024 IEEE.

关键词： Slot antennas

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A Wideband Omnidirectional Vertically Polarized Patch Antenna Fed with Coplanar L-Probe

A Wideband Omnidirectional Vertically Polarized Patch Antenn...

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2023 IEEE MTT-S International Wireless Symposium, IWS 2023

作者： Liu, Peng Zhang, Wenwu Zhang, Qing Wang, Qian Avic Research Institute for Special Structures of Aeronautical Composites Aviation Key Lab of Science and Technology on High Performance Electromagnetic Windows Tsinan China

ISBN: (纸本)9798350336535

In this paper, a wideband omnidirectional vertically polarized patch antenna is proposed. This antenna is composed of seven microstrip patch antennas with the coplanar L-shaped probe. Seven horizontally polarized microstrip antennas are arranged rotationally symmetrically to form the rotationally symmetrical current distribution in the horizontal plane, which can produce a vertically polarized omnidirectional radiation pattern. The proposed antenna has an impedance bandwidth of 28.9% (VSWR ≤ 2) from 5.62 to 7.52 GHz, and has an out-of-roundness of less than 0.1 dB in the H-plane. The antenna has a good application prospect in the satellite communication of UAVs. © 2023 IEEE.

关键词： Microstrip antennas

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A novel Wideband Frequency-Selective Polarization Converter for Reducing Backward-Scattering

A novel Wideband Frequency-Selective Polarization Converter ...

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2024 IEEE International Conference on Computational electromagnetics, ICCEM 2024

作者： Zhang, Xuewei Zhao, Shenghui Pang, Xiaoyu Avic Research Institute For Special Structures of Aeronautical Composite Aviation Key Lab of Science and Technology On High Performance Electromagnetic Windows Jinan250023 China

ISBN: (纸本)9798350383317

In this paper, we combine the frequency selective surface (FSS) with the polarization conversion surface to realize the frequency selective polarization converter (FSPC), which can be used to reduce the backward radar cross section. The proposed FSPC consists of a curved double-arrow reflection polarization conversion layer in the upper layer and a chamfer FSS layer in the lower layer. The results show that the transparent frequency band of 3-dB ranges from 8.9 to 14 GHz, and the relative bandwidth of the co-polarizing reflection coefficient less than-10dB is 135%. The reflection polarization conversion rate of the designed FSPC is over 90% in the frequency bands of 4-7.9 GHz and 16.3-20 GHz on both sides of the passband. Furthermore, the designed FSPC is arranged on a chessboard pattern to reduce backscattering energy in the broadband range from 3.5 to 23 GHz. Compared with traditional polarization converters, the designed FSPC exhibits an extra frequency selection performance of a broadband transmission window. These results will have potential applications in radomes to achieve wideband low backward RCS. © 2024 IEEE.

关键词： Frequency selective surfaces

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