Article
Chemistry, Multidisciplinary
Rong Bao, Xin Peng, Yin Yang, Neng Xiong, Yang Tao, Jifei Wu, Dawei Liu
Summary: Lossy dielectric bars have potential applications in high power microwave (HPM) radiation-effect experiments performed in wind tunnels. Under plane excitation, beat wave patterns are observed along lossy and lossless dielectric bars in 3-D electromagnetic simulation results. Mode analysis is performed to clarify the two main modes in the beat waves-the leaky and guided modes. Comparisons are made between the theoretical and simulated results and acceptable agreements are obtained. The absorbing array of lossy dielectric bars is further investigated. The array can attenuate 90% of the microwave power at 10 GHz when a ten-meter series of such arrays is arranged. It is expected that the proposed absorbing array can achieve the required attenuation, considering that the testing object under microwave radiation is also an absorbing structure itself.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Electrical & Electronic
Yun Zhang, Xi Jiang, Shihua Ding, Tianxiu Song
Summary: Temperature stable microwave dielectric ceramics CoZrNb2O8-xCaTiO(3) were fabricated by a solid-state technique, exploring the relationship between structure and properties. Proper addition of CaTiO3 reduced the sintering temperature, while excessive amount caused lattice defects.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
Lu Gao, Ruiduan Zhang, Cuoke Wei, Yichao Yin, Hang Zhang
Summary: The research focused on the dielectric and microwave absorption properties of La0.5Sr0.5CoO3 ceramics at different temperatures, aiming to develop a microwave absorbing material that can be used at 500 degrees C. It was found that the characteristics of the La0.5Sr0.5CoO3 powder remained stable even after sintering, and the La0.5Sr0.5CoO3/Al2O3 ceramic showed good microwave absorption properties in Ku band at 500 degrees C. Additionally, frequency selective surfaces (FSS) were designed to enhance the microwave absorption performance of the La0.5Sr0.5CoO3/Al2O3 ceramic in X band.
CERAMICS INTERNATIONAL
(2021)
Article
Polymer Science
Yongqiang Wang, Zhuo Zeng, Meng Gao, Ziye Huang
Summary: The addition of diphenylsilanediol to epoxy resin as a modifier improves the hygrothermal aging resistance and dielectric properties of silicone-modified insulation materials. The presence of diphenylsilanediol reduces the size of cracks in the material during hygrothermal aging, leading to better overall performance. However, excessive silicone material in the epoxy resin may result in poorer dielectric properties.
Article
Materials Science, Ceramics
Lanchao Wen, Jiaxin Zhang, Li Guan, Yujie Zhu, Biao Zhao, Limeng Song, Xinkai Zhu, Rui Zhang
Summary: Transition metal carbides (TMCs) are promising materials for high temperature electromagnetic wave absorption (EWA) due to their excellent dielectric properties and thermal stability. However, the high dielectric constant and electrical conductivity of TMCs often result in impedance mismatch and their high density limits practical applications. To overcome these issues, lightweight and impedance matching NbC nanowires (NbCnws) were prepared using bamboo powder as a carbon source. The NbCnws exhibited low density and superior EMA performance, with a minimum reflection loss of -43.03 dB at 5.92 GHz and a matching thickness of only 3.7 mm at a sintering temperature of 1500 degrees C. The excellent EWA performance was attributed to good impedance matching and dielectric loss. This research provides a prospect for the development and utilization of one-dimensional TMC materials in the field of microwave absorption materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Energy & Fuels
Hui Li, Yongbo Wang, Zhihao Han, Tianyu Wang, Yunpu Wang, Chenhui Liu, Min Guo, Guoning Li, Wanpeng Lu, Mingzhi Yu, Xiaoling Ma
Summary: This study creatively designs a highly stable calcium oxide catalyst with strong microwave absorbing capacity, which is anchored in nanosheet carbon. The prepared catalyst showed high catalytic activity and stability for biodiesel production.
Article
Materials Science, Ceramics
Peng Wu, Wenting He, Hongbo Guo
Summary: A novel microwave absorbing material, sodium cobaltates (Na0.78CoO2), with a lamellar structure, was synthesized and showed good electromagnetic attenuate property. The composite with 50 wt% Na0.78CoO2 and 50 wt% paraffin achieved a minimum reflection loss (RL) of around -51.7 dB at a frequency of 8.2 GHz when the thickness was about 2.41 mm. Its effective absorbing bandwidths (RL <-10 dB) were in the range of 12.5 to 15.6 GHz for a sample thickness of around 1.5 mm. The electromagnetic attenuation mechanisms of the composite were related to conductive loss, multiple reflection loss, and dipole or interfacial polarization loss.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Haotian Liu, Liang Shi, Cheng Liu, Dainan Zhang, Kui Liu, Huaiwu Zhang
Summary: Ion substitution engineering is effective in improving the crystal structure and performance of microwave dielectric ceramics. In this study, F- substitution for O2- in MgTa2O6 matrix was successfully achieved, resulting in significantly improved crystal structure morphology and stability, as well as enhanced microwave dielectric properties.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Meikang Han, Yury Gogotsi
Summary: The rapid development of communication and electronic technologies has generated new demands for electromagnetic radiation protection. MXenes, a type of two-dimensional transition metal carbides and nitrides, have quickly reshaped the field since their introduction in 2016. This article provides a perspective on the recent progress and challenges of MXenes in electromagnetic jamming protection, specifically electromagnetic interference shielding and microwave absorption. It discusses the intrinsic properties and design strategies of MXenes for optimizing their performance in electromagnetic protection, aiming to clarify misconceptions and objectively assess reported materials. Finally, it examines the future opportunities and challenges in the development of MXenes for electromagnetic radiation protection.
Article
Chemistry, Physical
Zijian Yang, Ying Tang, Jie Li, Weishuang Fang, Jinyan Ma, Aihong Yang, Laijun Liu, Liang Fang
Summary: A low-permittivity and low-loss ceramic Li4GeO4 with olivine structure was fabricated via solid state reaction, showing excellent microwave properties when sintered at 720 degrees C. Its potential as a candidate material for LTCC application was demonstrated through analysis of microwave dielectric performances.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Peng Wu, Wenting He, Hongbo Guo
Summary: This study successfully synthesized a series of microwave absorption materials (MAMs) with thin thickness, high oxidation resistance, and tunable effective absorbing bandwidth. Among them, the equilibrium phase in the (La1-xSrx)FeO3/Al2O3 pseudo-binary composite exhibited the best electromagnetic wave absorption property, with RLmin= -38dB and an effective absorption bandwidth (EAB) of up to 2.78 GHz at a thickness of 1.5 mm. The tunable EAB ranged from 1 mm to 3 mm, reaching 13.22 GHz, indicating its superior performance as a MAM. The excellent microwave absorbing properties were attributed to the space charge polarization, dipole polarization, and conductive loss caused by heterogeneous interfaces, doping, and directional movement of charge carriers.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Energy & Fuels
A. Mathiarasu, M. Pugazhvadivu
Summary: Non-edible seeds like karanja seeds have shown good microwave absorption characteristics and can be used for producing bio-oil as fuel for diesel engines through microwave pyrolysis.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Materials Science, Ceramics
Man Zhang, Zhiyong Tang, Hangfeng Zhang, Graham Smith, Qinghui Jiang, Theo Saunders, Bin Yang, Haixue Yan
Summary: This study focused on the dielectric properties of a single crystal La2Ti2O7 material in the microwave and terahertz bands, revealing its dielectric characteristics along a single crystallographic direction. The decrease in dielectric permittivity with increasing frequency is related to dielectric relaxation processes occurring from radio frequency to microwave and then to terahertz bands.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Review
Materials Science, Ceramics
P. Harshapriya, Deepak Basandrai
Summary: Bismuth titanate (BTO) and its composites are considered as prominent candidates for microwave absorption applications due to their high dielectric constant and losses. Doping with V, La, Sm, and Nd can enhance the ferroelectric and dielectric characteristics of BTO, while V-doped BTO exhibits the highest dielectric loss suitable for high temperature applications.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Jianwei Li, Jun Lin, Yugen Wang, Wei Chu, Fei Liu, Bin Wang
Summary: In this work, cross-linked and rigid polyimide (PI) composite foams with low density, high mechanical strength, thermal stability, fire resistance, ultralow dielectric characteristics, and excellent wave transparency were successfully fabricated, making them attractive candidates for applications in the aviation and aerospace fields.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Physics, Applied
Bao-Hong Guo, Guang-Yu Sun, Shu Zhang, Jian-Yi Xue, Run-Dong Zhou, Bai-Peng Song, Hai-Bao Mu, Guan-Jun Zhang
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2019)
Article
Physics, Applied
Run-Dong Zhou, Guang-Yu Sun, Bai-Peng Song, Bao-Hong Guo, Ning Yang, Hai-Bao Mu, Guan-Jun Zhang
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2019)
Article
Physics, Applied
Guang-Yu Sun, Bao-Hong Guo, Wen-Dong Li, Shu Zhang, Run-Dong Zhou, Bai-Peng Song, Hai-Bao Mu, Guan-Jun Zhang
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2020)
Article
Engineering, Environmental
Bai-Peng Song, Meng-Yao Zhang, Yue Fan, Ling Jiang, Jun Kang, Ting-Tao Gou, Cheng-Lei Zhang, Ning Yang, Guan-Jun Zhang, Xiang Zhou
Article
Engineering, Electrical & Electronic
Shu Zhang, Guang-Yu Sun, Hai-Bao Mu, Bai-Peng Song, Jianyi Xue, Guan-Jun Zhang
Article
Green & Sustainable Science & Technology
Bai-Peng Song, Meng-Yao Zhang, Yue Fan, Ling Jiang, Jun Kang, Ting-Tao Gou, Cheng-Lei Zhang, Ning Yang, Guan-Jun Zhang, Xiang Zhou
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Physics, Applied
Bai-Peng Song, Run-Dong Zhou, Xiong Yang, Shu Zhang, Ning Yang, Jin-Yong Fang, Fa-Lun Song, Guan-Jun Zhang
Summary: Charging of typical space materials can lead to electrostatic discharge under natural conditions, which may cause damage to spacecraft. This paper establishes a platform to simulate ESD induced by strong electromagnetic interference, and investigates various factors influencing the discharging mechanism through simulations and research.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
Ning Yang, Baipeng Song, Xiong Yang, Rundong Zhou, Guangyu Sun, Jianyi Xue, Hai-bao Mu, Guan-Jun Zhang
Summary: The secondary electron emission of solid materials is influenced by surface geometry parameters, which can be controlled by manipulating interaction angles and collision frequencies for functional design. Additionally, a method to estimate secondary electron yield numerically for given material surface geometry is proposed to provide more information for practical applications.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Xiong Yang, Guangyu Sun, Rundong Zhou, Kun Huang, Wendong Li, Chao Wang, Jiufeng Dong, Baipeng Song, Guanjun Zhang
Summary: In this study, a facile ion-exchange technique was used to fabricate a nanoscale polyimide/chromic oxide (PI/Cr2O3) nanocomposite coating with ultralow secondary electron emission yields (SEEY). The introduction of weakly emissive Cr2O3 nanoparticles and interfacial traps significantly improved the flashover strength of the coating while maintaining sufficient mechanical durability.
APPLIED SURFACE SCIENCE
(2022)
Article
Physics, Applied
Guang-Yu Sun, Ru-Hui Lian, Shu Zhang, Xiong Yang, Muhammad Farasat Abbas, Chao Wang, Bao-Hong Guo, Bai-Peng Song, Guan-Jun Zhang
Summary: Surface flashover in a vacuum is a destructive plasma discharge that affects various applications in electrical engineering, particle physics, and space engineering. This paper proposes and implements a continuum and kinetic simulation method as an alternative solution for flashover modeling, aiming to prevent particle noise in PIC models. A one-dimensional spatial, two-dimensional velocity kinetic simulation model is constructed and compared with existing PIC simulation and analytical predictions. The obtained kinetic simulation results are consistent and provide noise-free data for surface charge density. The proposed approach has the potential to inspire future modeling studies for flashover mechanisms and mitigation.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Xiong Yang, Guangyu Sun, Baipeng Song, Wenhu Han, Chao Wang, Wendong Li, Shu Zhang, Falun Song, Fangzheng Zou, Guanjun Zhang
Summary: A 3D-printed insulation structure with a millimeter-scale surface cavity covered by periodic through-pore array is designed to improve the vacuum surface insulation, effectively suppressing multipactor phenomena and improving the flashover threshold compared to conventional mitigation strategies. Experiments and simulations show that electrons in the multipactor region pass through the pores and are unlikely to escape from the cavity, thereby no longer participating in the above-surface multipactor process and eventually improving the flashover threshold. This approach provides new inspiration for the design of advanced insulators with ultra-high electrical withstanding capability and brings new insights into relevant industrial applications.
Article
Chemistry, Physical
Dandan Feng, Xiaojing Wang, Shike Zhao, Baipeng Song, Guanjun Zhang
Summary: With the development of vacuum electronic devices towards high power, high frequency, and miniaturization, the demand for higher voltage holdoff capacity of insulation materials has increased. By adding TiO2 to Al2O3 ceramics, researchers achieved a homogeneous microstructure with improved sintering. Heat treatment caused the reduction of TiO2, affecting the microstructure of the ceramic. The addition of a small amount of TiO2 improved the voltage holdoff performance in vacuum.
Article
Nanoscience & Nanotechnology
Fangzheng Zou, Xiong Yang, Xin Zhao, Ruhui Lian, Haoyan Liu, Wenrui Li, Baipeng Song, Guanjun Zhang
Summary: The presence of space charge in polymer insulation materials is a critical constraint for the advancement of high-voltage electrical devices. The author develops a platform utilizing the photo-stimulated discharge method to measure the trap energy spectra of polymer dielectric materials, providing valuable insights into the characterization of such spectra.
Proceedings Paper
Engineering, Electrical & Electronic
Yue Fan, Ling Jiang, Jun Kang, Shengfu Wang, Chenglei Zhang, Mengyao Zhang, Baipeng Song, Guanjun Zhang
2020 IEEE ELECTRICAL INSULATION CONFERENCE (EIC)
(2020)
Article
Physics, Fluids & Plasmas
Guang-Yu Sun, Yuan Li, Shu Zhang, Bai-Peng Song, Hai-Bao Mu, Bao-Hong Guo, An-Bang Sun, Guan-Jun Zhang
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2019)
