Article
Physics, Multidisciplinary
Yang Fu, Helin Yang, Houyuan Cheng, Shanshan Liu, Shangru Li, Aidong Zhang, Dinge Wen
Summary: In this paper, a polarization-sensitive absorption and transmission polarization conversion multifunctional metasurface is designed, which can modulate and convert electromagnetic waves with different polarizations. The proposed design is verified through optimization and experimental measurements.
Article
Engineering, Electrical & Electronic
Haobin Hu, Wenhe Liao, Liming Hou, Qing An, Xiang Zhang
Summary: This letter presents an ultra-thin microwave metamaterial for ultra-broadband radar cross section reduction, featuring broadband absorption and polarization conversion achieved through a impedance surface pattern with split-square-loops. The design shows 85% absorption from 3.8 to 19.2 GHz under normal incidence, with a fractional bandwidth of 134% realized by multiple resonances and polarization conversion rate above 0.3 in the operating frequency band. The ultra-thin design with ultra-broadband RCS reduction performance provides an alternative for stealth applications in satellite solar panels.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Senfeng Lai, Guiyang Liu, Yanpei Guo, Yang Liu
Summary: In this paper, a metamaterial absorber with a checkerboard patterned ITO film surface is designed using flexible and optically transparent wave-absorbing material ITO-PET. The absorber shows excellent performance with high absorptance, high transmittance, and reduction in radar cross-section. It also has the advantages of polarization insensitivity and angular stability.
Article
Materials Science, Composites
Yu Sun, Yongqiang Pang, Runhua Chen, Baobao Qiao, Jiaheng Yang, Bingyue Qu, Zhenrong Li, Zhuo Xu
Summary: Metasurface-based sandwich composites are designed to achieve radar cross section (RCS) reduction within a wide frequency band. The RCS reduction is realized by spatially arranging unit cells with different reflection phases. The proposed composites consist of a metasurface core sandwiched between glass fiber and carbon fiber reinforced skins. The increasing layer number of the metasurfaces substantially expands the RCS reduction bandwidth. The fabricated four-layer metasurface-based composite achieves -10 dB RCS reduction from 2.2 to 15.7 GHz, showing good agreement with simulations. The proposal has potential applications in the radar stealth field.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Changfeng Fu, Lei Zhang, Lijun Liu, Shaohua Dong, Weijun Yu, Lianfu Han
Summary: A metasurface absorber made of patterned graphene sandwich structure, transparent flexible PVC dielectric layer, and ITO bottom plate is proposed. The results show that the proposed transparent flexible metasurface can achieve more than 10 dB RCS reduction in dual band, wideband, and single band, with the sheet resistance of graphene ranging from 70 to 350 O/sq.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Chemistry, Analytical
Pingping Min, Zicheng Song, Lei Yang, Victor G. Ralchenko, Jiaqi Zhu
Summary: A novel conformal metamaterial absorber with simultaneous optical transparency and broadband absorption is proposed in this study. The use of transparent substrates allows for good optical transmittance and flexibility. Experimental results validate the reliability of the design, and the absorber is highly favored for practical applications in microwave engineering due to its absorption performance and versatility.
Article
Chemistry, Analytical
Zhiming Zhao, Xiaoping Li, Guoxiang Dong
Summary: Traditional stealth technologies have problems of high cost and large thickness, which can be solved by using novelty checkerboard metasurface in stealth technology. The hybrid checkerboard metasurface with two types of polarization converter units arranged in turn can effectively reduce radar cross-section (RCS) and be insensitive to the polarization of incoming EM waves. The experiment and simulation results prove the effectiveness of mutual compensation in the field of checkerboard metasurfaces for stealth technology.
Article
Chemistry, Physical
Zhao Zhang, Yazhong Zhang, Tianlong Wu, Shaowen Chen, Wei Li, Jianguo Guan
Summary: A quaternionic metasurface with two pairs of units with destructive phase difference is proposed to extend the bandwidth of radar cross section reduction. The design enhances RCS reduction by overlapping the bandwidth of each pair, resulting in broadband and strong RCS reduction. The analytical calculation, numerical simulation, and experimental validation confirm the design and wideband RCS reduction capability of the quaternionic metasurface, while also investigating its scattering mechanism and angular performance.
Article
Optics
Hai Lin, Junjie Hou, Jing Jin, Yumei Wang, Rongxin Tang, Xintong Shi, Yuze Tian, Weilin Xu
Summary: The combination of machine learning and evolutionary optimization algorithm proposed in this paper provides an automatic solution for electromagnetic inverse design problems, paving the way for the optimization of other metadevices.
Article
Engineering, Electrical & Electronic
Tiancheng Han, Kaihuai Wen, Zixuan Xie, Xiuli Yue
Summary: We experimentally demonstrate an ultra-thin wideband reflection reduction metasurface by utilizing polarization conversion instead of resonant absorption. A simple cut-wire unit cell is adopted for efficient cross polarization conversion, achieving a conversion ratio above 90% in a high frequency range. By arranging the units in a specific layout, significant reduction in reflection is achieved. The measured results confirm the effectiveness of the proposed structure, demonstrating excellent comprehensive performance.
PROGRESS IN ELECTROMAGNETICS RESEARCH-PIER
(2022)
Article
Computer Science, Interdisciplinary Applications
Wenfeng Chen, Huajun Liu, Yongtao Jia, Ying Liu, Xing Wang
Summary: This paper proposes an ultra-wideband low scattering metamaterial based on the combination of water absorber and polarization rotation metasurface (PRM). The water absorber and PRM achieve low backscattering in different frequency bands. The designed water absorber and PRM operating in two adjacent frequency bands result in a continuous low-scattering bandwidth. The simulated results demonstrate a reduction in radar cross section (RCS) of more than 10 dB in the ultra-wideband band of 2.8-80 GHz, with excellent thermal and angle stabilities.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Crystallography
Fang Yuan, Qiang Chen, Yuejun Zheng, Yunqi Fu
Summary: This paper presents a dual-mechanism method to design a single-layer absorptive metasurface with wideband 20 dB RCS reduction. The metasurface combines absorption and phase cancellation mechanisms, and utilizes two unit cells with absorption performance and different reflection phases. Numerical and experimental results show that the single-layer absorptive metasurface features wideband 20 dB RCS within 11.5-16 GHz with a thickness of only 3 mm.
Article
Engineering, Electrical & Electronic
Abhinav Bhardwaj, Gaganpreet Singh, Kumar Vaibhav Srivastava, J. Ramkumar, S. Anantha Ramakrishna
Summary: A simple optically transparent absorber based on a double complementary structured layer of ITO deposited polyethylene terephthalate film is presented. The structure exhibits high absorption from 2 to 4.5 GHz frequencies, has polarization-insensitive response and is highly stable for oblique wave incidence. It can be flexibly wrapped on curved surfaces and reduces the radar cross section.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Bahareh Khodadadi, Pejman Rezaei, Vahid Ghods, Majid Babaeinik
Summary: This article proposes and examines a polarization-insensitive broadband adjustable THz metamaterial absorber. The absorber is made up of a periodic array of patterned graphene elements, providing a wide bandwidth and high absorption rate. It exhibits polarization-independent characteristics and is suitable for various applications.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Zhiyun Zhang, Xiangyu Cao, Huanhuan Yang, Tong Li, Jianghao Tian, Jun Gao
Summary: A novel design strategy integrating good radiation and broadband low radar cross section characteristics based on metasurface concept is proposed in this paper. Thinned array antenna A1 and checkerboard metasurface antenna A2 are designed, showing similar radiation performance and in-band and out-of-band RCS reduction in any polarized normal incidence compared to conventional rectangular grid array. Reasons and merits of different arrangements are analyzed with simulated and measured results confirming the effectiveness of the design strategy.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Forestry
Gang Wei, Ke Rong, Kexin Yang, Zhiying Bao, Xiaotong Zhang, Zhi Zhang, Yanni Gong, Jiafu Wang
Summary: After maturation, Korean pine seeds rely on animal dispersal for regeneration due to difficulty in reaching suitable germination sites. Squirrels prefer pine seeds as winter food because of their high energy content and ease of storage. Korean pine seeds not only provide nutrition for squirrels, but also promote their physical health and immunity.
JOURNAL OF FORESTRY RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Songyan Li, Xiaoxia Tian, Jiafu Wang, Song Xia, Lisi Ma, Junxiang Zhou, Chenchen Li, Zhe Qin, Shaobo Qu
Summary: By dotting 3D graphene particles, the microwave absorption performances of Fe3O4@N-C composite derived from Fe-MOF have been successfully improved. The electromagnetic parameters of the composites can be effectively adjusted by controlling the addition of 3D graphene. The optimal composite displays outstanding absorption performances, achieving wide effective absorption bandwidth at different matching thicknesses.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Optics
Ruichao Zhu, Jiafu Wang, Jinming Jiang, Cuilian Xu, Che Liu, Yuxiang Jia, Sai Sui, Zhongtao Zhang, Tonghao Liu, Zuntian Chu, Jun Wang, Tie Jun Cui, Shaobo Qu
Summary: This paper introduces the use of machine learning to solve the multispectral compatibility problem in metamaterial design and designs a multi-mechanism metafilm that achieves small microwave scattering, low infrared emissivity, and visible transparency simultaneously. Rapid evolution of structural design is realized by establishing a mapping between spectral curves and structural parameters.
PHOTONICS RESEARCH
(2022)
Article
Physics, Applied
Chao Liu, Zhe Qin, Yongfeng Li, Tonghao Liu, Jiafu Wang, Shaobo Qu
Summary: In this paper, a low RCS TCDA based on a novel FSPC is proposed. The FSPC structure consists of a polarization conversion metasurface and a band-pass frequency selective surface. The coding sequence of FSPC is obtained using simulated annealing algorithm for RCS reduction. The co-design of TCDA with FSPC is presented and the radiation performance meets the design requirements. Measurement results show significant reflection reduction from 15 GHz to 21 GHz compared with a metallic plane of the same size, and the simulated and measured radiation patterns agree well.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Shuo Wang, Jian Wang, Yafei Song, Sicong Li, Wei Huang
Summary: This paper proposes a vision-based method for detecting malware variants, which addresses cybersecurity threats in an intelligent and efficient manner. By optimizing malware image processing and feature extraction methods, as well as utilizing a hyperparameter optimization algorithm, the detection model achieves higher accuracy and efficiency.
APPLIED SCIENCES-BASEL
(2022)
Article
Computer Science, Artificial Intelligence
Jie Lai, Xiaodan Wang, Qian Xiang, Jian Wang, Lei Lei
Summary: This study proposes a novel deep learning algorithm for classification tasks with label information. By introducing the Fisher criterion, the algorithm is able to learn more discriminative abstract features, resulting in better performance and robustness in classification.
COMPLEX & INTELLIGENT SYSTEMS
(2023)
Article
Physics, Multidisciplinary
Zhe Qin, Yongfeng Li, He Wang, Chenchen Li, Chao Liu, Zhibiao Zhu, Qi Yuan, Jiafu Wang, Shaobo Qu
Summary: The functional versatility and flexibility of multifunctional metasurfaces are significant for various applications. This study proposes an active programmable coding metasurface that integrates transmission and reflection control of polarized electromagnetic waves in real time.
ANNALEN DER PHYSIK
(2023)
Article
Engineering, Electrical & Electronic
Dou Tian, Amin Kianinejad, Ting Shi, Chen Guo, Jiafu Wang, Anxue Zhang
Summary: A compact dual-band high-efficiency antenna based on spoof surface plasmon polaritons (SSPPs) is proposed in this article, which effectively excites both the TM10 mode and the LC resonant mode. The antenna achieves compact size and high radiation efficiency due to the high field confinement and effective refractive index of SSPPs. A reliable circuit model is proposed for the antenna and a prototype is fabricated and measured. The proposed dual-band antenna shows high total efficiencies and has potential applications in wireless communication systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Physics, Applied
Tianshuo Qiu, Weihan Li, Jiafu Wang, Jianqi Wang, Qiang An, Bingyang Liu, Yangfan Hou, Juanna Jiang, Wenxuan Tang, Ziru Cheng, Shaobo Qu
Summary: A method of achieving asymmetric transmission is proposed by exploiting the direction-dependent absorption of spoof surface plasmon polaritons (SSPPs). By combining trapezoidal wire arrays as absorbers with cutting metal wires as polarization rotators, the metamaterial exhibits different properties depending on the incident wave direction, enabling asymmetric transmission. The conversion of incident waves to SSPPs is efficiently achieved by trapezoidal wire arrays, while the propagation and absorption of SSPPs can be controlled by engineering the spatial dispersion of k-vector. The polarization rotation performance can be customized by changing the length of cutting metal wires. The study demonstrates the effectiveness of the proposed method, providing design flexibility and efficiency for asymmetric transmission.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Applied
Bingyue Qu, Yongqiang Pang, Jiafu Wang, Xinmin Fu, Hongyu Shi, Luyi Wang, Anxue Zhang, Zhuo Xu
Summary: This paper proposes a wideband low-profile top-loaded patch monopole antenna based on surface current engineering. By loading inductive vias on the outermost rings and connecting them to the ground, the low-frequency resonance can be enhanced, achieving antenna miniaturization and bandwidth enhancement. The method provides a path for antenna design in low-profile ultra-wideband applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Ceramics
Ying Zhu, Lei Zhang, Jun Wang, Fang Zhou, Boheng Gui, Mingde Feng, Jiafu Wang, Shaobo Qu
Summary: In order to achieve microwave-infrared compatible stealth in high temperature conditions, thin films of high-entropy alloys (HEAs) were deposited on an Al2O3 matrix using magnetron sputtering technology. The thermal stability of the films was investigated through annealing at temperatures of 500°C, 600°C, and 700°C. The results showed that the HEA film was severely oxidized at 700°C for 6 hours, leading to a significant decrease in infrared reflectivity. However, the HEA films exhibited low infrared emissivity of 0.09 at 600°C and excellent thermal stability at 500°C for 20 hours with low infrared emissivity of 0.11. A simple metamaterial design utilizing HEA films was proposed for infrared-microwave compatible stealth. The study demonstrates the great potential of introducing HEAs in the field of high temperature compatible stealth due to their excellent thermal stability and durable high temperature stealth performance.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Chang Ding, Yudeng Wang, Junxiang Zhou, Huilin Mu, Yajuan Han, Fanyi Meng, Jiafu Wang
Summary: Liquid crystals with tunable dielectric properties in the microwave frequency band are of great significance for design of reconfigurable microwave devices. This article proposes a method for characterizing the dielectric properties of liquid crystals based on epsilon-near-zero metamaterials. The method involves designing a measurement device, integrating biased circuits and preconditioned alignments, and controlling the temperature of the liquid crystals. The effectiveness of the method is verified through experiments.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Zuntian Chu, Tiefu Li, Jiafu Wang, Yajuan Han, Ruichao Zhu, Tiejun Cui, Shaobo Qu
Summary: By utilizing the synergy of multimechanism resonances, this article proposes a method to achieve electromagnetic windows (EMWs) that enable broadband transmissions of both TM-and TE-polarized waves in an ultrawide range of incident angles. The proposed EMW utilizes Fano resonance and Drude resonances to expand the bandwidth for TE-polarization and suppress adverse influences of the parasitic Lorentz resonance for TM-polarization, respectively. Experimental validation confirms the ultrawide-angle broadband functionalities of this EMW, which can have wide applications in radar, communication, and imaging systems.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Physics, Applied
Yajuan Han, Jiafu Wang, Xinmin Fu, Hongya Chen, Chang Ding, Shaobo Qu
Summary: In this paper, the electromagnetic properties of tightly coupled spoof surface plasmon polariton (SSPP) modes and a slender broadside antenna based on the tightly coupled SSPP are investigated and proposed. The compactness and miniaturization of microwave devices are favored by the tight confinement of TC-SSPP modes around the slender structure. A prototype of the proposed antenna was designed, fabricated, and measured, with both simulated and measured results verifying the design.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Zuntian Chu, Xinqi Cai, Tiefu Li, Ruichao Zhu, Huiting Sun, Yuxiang Jia, Yajuan Han, Jiafu Wang
Summary: Artificially elaborated metasurfaces have revolutionized the manipulation of electromagnetic waves in microwave, terahertz, and optics fields. This study proposes a highly efficient ultra-wideband transmissive metasurface using twisted nematic liquid crystals, which allows for simultaneous control of amplitude, phase, and polarization with high bandwidth and maintained polarization. Two proof-of-prototypes demonstrate the feasibility and significance of this approach.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)