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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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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 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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A novel Graphene Frequency Selective Surface with Switching Characteristic 12

A novel Graphene Frequency Selective Surface with Switching ...

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

作者： Zhang, Xuewei Liu, Xinkun Wang, Bao 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)9798350351019

In this paper, a novel graphene frequency selective surface (GFSS) composite structure is proposed, which is based on the electromagnetic tunability of graphene and the passive metal structure with special electromagnetic response. The proposed GFSS is composed of an aperture coupling resonator and a graphene structure, and the electrical coupling between the cross resonators on both sides of the aperture is dominant. The electromagnetic field distribution at the end of the upper and lower layer resonator is controlled by adjusting the chemical potential of graphene to realize the on or off state of the FSS passband. The simulated results indicate that the transmission and cutoff at the resonance frequency can be changed by adjusting the squared resistance of graphene. This study has certain value in expanding the FSS design and the application of graphene. © 2024 IEEE.

关键词： Cutoff frequency

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The Joint Radar Cross Section Imaging and Inversion Method Based on Modified Backprojection Algorithm

The Joint Radar Cross Section Imaging and Inversion Method B...

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2024 International Conference on Intelligent Communication, Sensing and electromagnetics, ICSE 2024

作者： Liang, Da Pang, Xiaoyu Dong, Shukun Gao, Maocheng AVIC Research Institute for Special Structures of Aeronautical Composite Aviation Key Lab. of Science and Technology on High Performance Electromagnetic Windows Shandong Ji'nan China

ISBN: (纸本)9798350354935

high stealth property is the core performance of modern weapons and equipment. In general, radar cross section (RCS) is used to represent the steal performance. The RCS imaging and inversion play an important role in evaluating the steal performance of modern weapons and equipment. In this paper, the principle of two-dimensional RCS imaging is introduced firstly. Then, the RCS imaging and inversion method based on modified backprojection algorithm is proposed. The joint RCS imaging and inversion method are both verified by simulation experiments. The results show that the proposed method has high accuracy. © 2024 IEEE.

关键词： Radar cross section

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Synthesis of Nano-aluminum Nitride powder at low temperature by Sol-gel method 4

Synthesis of Nano-aluminum Nitride powder at low temperature...

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2023 4th International Conference on Advanced Materials and Intelligent Manufacturing, ICAMIM 2023

作者： Zhang, Shuwei Men, Weiwei Wu, Xiao Zhu, Siyu Xu, Hui AVIC Research Institute for Special Structures of Aeronautical Composite Jinan250023 China Aviation Key Lab of Science and Technology on High-performance Electromagnetic Windows Jinan250023 China

In this paper, molecular-level mixed aluminum nitride has been prepared from aluminum sec-butyl alcohol, glucose, and urea by sol-gel processing. Then, the nano-aluminum nitride powder with uniform particle size distribution was obtained by carbothermal reduction nitridation reaction. The effects of different feed ratios, reaction temperatures, and holding times on the phase of AlN powder were systematically studied. The prepared nano-aluminum nitride powder has a uniform particle size and a near-spherical shape, and its grain size is approximately 20~30 nm. The preparation temperature in this method was significantly reduced from the same preparation method of aluminum nitride powder. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Aluminum nitride

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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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