Article
Nanoscience & Nanotechnology
Xuefeng Han, Yonghua Wang, Jinkai Xu, Huadong Yu
Summary: This article introduces a frequency-selective surface-based metamaterial absorber with small thickness and large bandwidth, demonstrating its absorption capacity through simulations and experiments.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Hao Huang, Changzhou Hua, Zhongxiang Shen
Summary: The integration of frequency-selective surfaces (FSSs) and microwave absorbers overcomes the limitation of transmission band within the absorption band, achieving absorption-transmission-absorption frequency response. This is done by integrating a bandpass FSS and wideband absorber to introduce a low insertion loss transmission window within the absorption band, while minimizing insertion loss in the passband with a bandstop FSS.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Optics
Baojing Hu, Ming Huang, Li Yang, Jinyan Zhao
Summary: A dual-controlled tunable polarization-independent perfect absorber based on bulk Dirac semimetal (BDS) and strontium titanate (STO) is proposed and analyzed. The results show that the absorptivity can reach 99% at 1.26 THz due to the critical coupling effect. Meanwhile, the absorptivity and resonant frequency of the proposed absorber can be dual-tuned dynamically by varying the temperature of the STO and the Fermi energy of the BDS. This work provides potential applications in the design of dual-tunable filters and absorbers.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Yasmine Abdalla, Hany Hammad
Summary: This study analyzed single-layer ultrathin absorber patch elements under different angles of incidence and proposed a compensation technique for impedance variation with angle changes. An equivalent-circuit model was formulated to realize the absorption response of rectangular patch absorbers using simple equations, and multiple subcells of simple patches were used to add another degree of freedom for design equations while maintaining the ultrathin planar feature. The developed structure exhibited angular stability, polarization insensitivity, and a planar non-complicated configuration compared to previously reported structures.
IET MICROWAVES ANTENNAS & PROPAGATION
(2021)
Article
Computer Science, Information Systems
Liansheng Wang, Dongyan Xia, Quanhong Fu, Xueyong Ding, Yuan Wang
Summary: This paper presents a mechanically controlled switchable wideband frequency-selective absorber, which incorporates a frequency-selective surface and a rotatable metal plate. The absorber achieves over 90% absorption from 3.9 GHz to 11.77 GHz when the metal plate is parallel to the rest of the layers, and a transmission coefficient of 0.62 at 11.6 GHz when the metal plate is perpendicular to the rest of the layers. The mechanism of wideband absorption and transmission is explained by monitoring and analyzing the surface current distribution. The control method is simple, reliable, and accurate, making it applicable in communication and radar stations.
Article
Engineering, Electrical & Electronic
Baoqin Lin, Wenzhun Huang, Lintao Lv, Jianxin Guo, Zuliang Wang, Rui Zhu
Summary: By designing monopolarized and dual-polarized polarization-rotating frequency-selective surfaces (PR-FSSs), it is possible to achieve both polarization rotation and frequency selection simultaneously. The monopolarized PR-FSS has a relative bandwidth of 13.58%, while the final-designed dual-polarized PR-FSS can still perform stably under both x- and y-polarized incidences.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Manish Mathew Tirkey, Nisha Gupta
Summary: This article presents a cost-effective, conformal, polarization-insensitive electromagnetic wave absorber with ultrathin and ultrawideband characteristics. It achieves over 90% absorptivity and is suitable for conformal applications.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2022)
Article
Mechanics
Yuetang Wang, Cheng Huang, Jinqiang Peng, Liming Yuan, Yuzhuo Qi, Xiangang Luo
Summary: This paper proposes a flexible and broadband absorbing woven fabric with good mechanical property, which shows great potential for the development of novel flexible absorbers in wearable electronics and communication fields.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Electrical & Electronic
Yudi Fan, Da Li, Hanzhi Ma, Jiaqi Xing, Yijie Gu, Lay Kee Ang, Er-Ping Li
Summary: This communication proposes an ultrawideband dual-polarized frequency-selective absorber with a tunable reflective notch. The structure consists of a broadband absorber and a tunable lossless frequency-selective surface. The reflective notch can be tuned with varactors and a dc bias. The measured results of the prototype show good agreement with the simulated results.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Fan He, Kaixuan Si, Rui Li, Dace Zha, Jianxiong Dong, Ling Miao, Shaowei Bie, Jianjun Jiang
Summary: In this study, a method for designing and fabricating a dual-section step-impedance frequency selective surface absorber for oblique incidence applications is proposed. The absorber structure has a wide absorption band and wide scan angle, making it competitive in practical applications. The dielectric layers were fabricated with a honeycomb structure to ensure high structural strength and low weight, validating the design principle and fabrication process.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Chol-Song Ri, Hye-Jong Yun, Song-Jin Im, Yong-Ha Han
Summary: This paper focuses on the bandwidth analysis of a resistive frequency selective surface (FSS) in a microwave metamaterial absorber, with a particular emphasis on how to design the FSS pattern to achieve the largest bandwidth in the case of thicker dielectric substrates. By investigating the relationship between the bandwidth and the FSS reactance, explicit expressions of the FSS reactance for the largest bandwidth are revealed. The findings provide design guidance for achieving the largest bandwidth in the FSS patterns of perfect absorbers.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2022)
Article
Physics, Applied
Feng Zhao, Junjie Wang, Dejun Feng, Qihua Wu, Xiaobin Liu
Summary: In this paper, a time-modulated active frequency selective surface absorber/reflector is proposed for manipulating the spectral distribution of the echo signal. The switch between absorbing and reflecting states can be flexibly controlled through a coding control network. Experimental results demonstrate the required function of spectrum conversion.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Varun Chaudhary, Ravi Panwar
Summary: This research presents a new type of terahertz absorber with characteristics of polarization insensitivity, angular stability, and tunability, achieving high absorption over a wide frequency range. The absorber design was optimized using an artificial neural network approach, demonstrating its effectiveness through experimental verification.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Maojun Li, Wei Zhang
Summary: This paper presents a broadband absorber consisting of three frequency selective surfaces (FSS) layers. The FSS layers consist of four identical rectangles and two circular arcs, and the proposed design method is validated through simulations and measurements. The simulation results show that the proposed absorber has an absorption greater than 80% in the frequency range of 3.8-11.9 GHz, with a relative absorption bandwidth of 103%, and the absorption of TE and TM waves remains stable even at an incident angle of 25 degrees.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Computer Science, Information Systems
Andrei-Marius Silaghi, Aldo De Sabata, Ladislau Matekovits
Summary: A multifunctional frequency selective surface with a simple metal layer design has been proposed, which can achieve dual linear polarization filtering and linear-to-circular polarization conversion in the low GHz frequency range. The structure has shown high insertion loss and angular stability, making it suitable for various applications.