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A kirigami-based reconfigurable metasurface for selective electromagnetic transmissionmodulation

npj Flexible electronics 2024年第1期8卷 408-416页

作者： Shuchang He Chengjun Wang Jie Tao Haishan Tang Zuojia Wang Jizhou Song Huanjiang Laboratory Department of Engineering MechanicsSoft Matter Research CenterKey Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceState Key Laboratory of Brain-Machine IntelligenceZhejiang UniversityZhejiangChina International Joint Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang ProvinceZhejiang UniversityZhejiangChina Department of Rehabilitation Medicine The First Affiliated Hospital School of MedicineZhejiang UniversityZhejiangChina

Tunable three-dimensional(3D)electromagnetic metasurfaces are essential for achieving selective modulation of polarized waves,but they usually require complex designs and the use of smart materials,posing great implementation ***,we propose a novel kirigami-based reconfigurable electromagnetic metasurface,which consists of a kirigami-based deformable thin polyimide substrate and periodically arranged copper split-ring *** simple stretch,the twodimensional(2D)planar metasurface can be uniformly transformed into a 3D state,enabling it to effectively and selectively modulate linearly and circularly polarized *** and numerical results reveal the mechanical deformation and transmission characteristics of the metasurface under applied *** is shown that the metasurface exhibits good selective transmission tunability while the resonant frequency remains basically unchanged for both transverse electric and transverse magnetic polarized ***,the selective tuning mechanism and the influence of geometrical parameters are also illustrated by the equivalent circuit analysis.

关键词： polarized transverse unchanged

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A Miniaturized Absorber for Radiation Suppression in the Chip Package 7

A Miniaturized Absorber for Radiation Suppression in the Chi...

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7th IEEE International Symposium on Electromagnetic Compatibility, ISEMC 2023

作者： Lin, Chaolong Xing, Jiaqi Li, Da Li, Er-Ping Zhejiang University The Zhejiang Key Lab. of Advanced Micro/Nano Electronic Devices Smart Systems and Applications Hangzhou China

ISBN: (纸本)9798350333107

In this page, a miniaturized absorber with ultrawide absorption band is designed and applied for radiation leakage suppression in the chip package. The proposed unit is a double-layer structure with two patterned resistive films of ITO etched on top of the dielectric substrate. The patterned layer is composed of a meandering square ring and a centric circular patch which enhances the coupling within the unit and facilitates the miniaturization of the structure. The size of the unit is 0.08λL× 0.08λL(λL is the wavelength in the free space of the lowest absorption frequency). When the periodic boundary condition is set in the simulation, it shows a broad absorption band (S11-10dB) covering 23.8-40 GHz. This unit is then used as a square ring structure for radiation suppression in chip package which demonstrates a -10dB bandwidth within 25.5-39.5 GHz. © 2023 IEEE.

关键词： Dielectric materials

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A Novel 3-D Frequency Selective Surface With Ultrawide Passband and High Selectivity 11

A Novel 3-D Frequency Selective Surface With Ultrawide Passb...

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11th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2023 - Proceedings

作者： An, Xiaodong Xie, Jialong Li, Da Fan, Yudi Li, Erping Zhejiang University The Zhejiang Key Lab. of Advanced Micro/Nano Electronic Devices Smart Systems and Applications Hangzhou310000 China

ISBN: (纸本)9798350326277

In this paper, a novel 3-dimensional (3-D) frequency selective surface (FSS) structure with ultrawide passband and high selectivity is proposed. Compared to traditional two-dimensional (2-D) wideband structures, (3-D) structures offer enhanced selectivity but exhibit higher insertion loss in the passband. Moreover, three-dimensional structures are often more complex and challenging to manufacture. This paper proposes a simplified three-layer structure. When vertically incident, the FSS exhibits a -3 dB bandwidth of 8-18.4 GHz with a relative bandwidth of 78.7%. Additionally, it forms a stopband with a suppression level exceeding -10 dB within the frequency range of 0-5.2 GHz. In the TE mode, the FSS maintains excellent operational performance within an incident angle range of 0-40 degrees. © 2023 IEEE.

关键词： frequency selective surface passband wideband

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Design of Wideband Electromagnetic Absorbers Based on Deep Learning 6

Design of Wideband Electromagnetic Absorbers Based on Deep L...

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6th International Conference on Robotics, Intelligent Control and Artificial Intelligence, RICAI 2024

作者： Ji, Wan Li, Yan Li, Erping Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province China Jiliang University Zhejiang China Key Laboratory of Advanced Micro-Nano Electronic Devices & Smart Systems and Applications Zhejiang University Zhejiang China

ISBN: (纸本)9798331541699

This paper presents a deep learning-based multilayer perceptron (MLP) neural network approach for the design and optimization of electromagnetic absorbers operating in the 20-30 GHz frequency range. This method offers significant advantages in terms of miniaturization and wide bandwidth. By training the MLP neural network, the absorber structure is automatically optimized within this frequency band. The predicted results are in strong agreement with full-wave simulation outcomes. The findings demonstrate that this approach effectively enhances absorber efficiency, providing a novel solution for electromagnetic compatibility and stealth technology applications. © 2024 IEEE.

关键词： Stealth technology

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MIMO performance enhancement of MIMO arrays using PCS-based near-field optimization technique

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Science China(Information Sciences) 2023年第6期66卷 170-185页

作者： Yipeng WANG Xiaoming CHEN Huiling PEI Wei E.I.SHA Yi HUANG Ahmed A.KISHK School of Information and Communications Engineering Xi'an Jiaotong University Key Laboratory of Micro-Nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science and Electronic EngineeringZhejiang University Department of Electrical Engineering and Electronics University of Liverpool Department of Electrical and Computer Engineering Concordia University

Extensive efforts have been made in designing large multiple-input multiple-output(MIMO)arrays. Nevertheless, improvements in conventional antenna characteristics cannot ensure significant MIMO performance improvement in realistic multipath environments. Array decorrelation techniques have been proposed, achieving correlation reductions by either tilting the antenna beams or shifting the phase centers away from each other. Hence, these methods are mainly limited to MIMO terminals with small arrays. To avoid such problems, this work proposes a decorrelation optimization technique based on phase correcting surface(PCS)that can be applied to large MIMO arrays, enhancing their MIMO performances in a realistic(non-isotropic)multipath environment. First, by using a near-field channel model and an optimization algorithm, a near-field phase distribution improving the MIMO capacity is obtained. Then the PCS(consisting of square elements)is used to cover the array's aperture, achieving the desired near-field phase *** examples demonstrate the effectiveness of this PCS-based near-field optimization technique. One is a1 × 4 dual-polarized patch array(working at 2.4 GHz)covered by a 2 × 4 PCS with 0.6λ center-to-center distance. The other is a 2 × 8 dual-polarized dipole array, for which a 4 × 8 PCS with 0.4λ center-to-center distance is designed. Their MIMO capacities can be effectively enhanced by 8% and 10% in single-cell and multi-cell scenarios, respectively. The PCS has insignificant effects on mutual coupling, matching, and the average radiation efficiency of the patch array, and increases the antenna gain by about 2.5 dB while keeping broadside radiations to ensure good cellular coverage, which benefits the MIMO performance of the *** proposed technique offers a new perspective for improving large MIMO arrays in realistic multipath in a statistical sense.

关键词： antenna correlation array antenna multiple-input multiple-output (MIMO) capacity

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A Novel Miniaturized Zigzag Hexagonal Frequency Selective Surface 11

A Novel Miniaturized Zigzag Hexagonal Frequency Selective Su...

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11th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2023 - Proceedings

作者： Xie, Jialong An, Xiaodong Li, Da Ma, Hanzhi Li, Er-Ping Zhejiang University The Zhejiang Key Lab. of Advanced Micro/Nano Electronic Devices Smart Systems and Applications College of Information Science and Electronic Engineering Hangzhou China

ISBN: (纸本)9798350326277

A novel miniaturized zigzag hexagonal frequency selective surface (FSS) element is proposed, where the structure has a dual-polarized angular stable passband. The FSS resonates at 4.0GHz, with a 3 dB passband spanning from 3.1 GHz to 4.72GHz, accommodating both transverse electric (TE) and transverse magnetic (TM) polarizations. Impressively, even at a 60° incidence angle, the shift in the transmission zero for the TE polarized wave is a mere 0.3%, demonstrating notable stability in terms of polarization and angular response. © 2023 IEEE.

关键词： frequency selective surface (FSS) high angle stability passband.

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Reconfigurable Three-Dimensional Thermal Dome

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Engineering 2025年第3期46卷 236-244页

作者： Yuhong Zhou Fubao Yang Liujun Xu Pengfei Zhuang Dong Wang Xiaoping Ouyang Ying Li Jiping Huang State Key Laboratory of Surface Physics&Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education) Department of PhysicsFudan UniversityShanghai 200438China Graduate School of China Academy of Engineering Physics Beijing 100193China International Joint Innovation Center The Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining 314400China State Key Laboratory of Extreme Photonics and Instrumentation&Key Laboratory of Advanced Micro-Nano Electronic Devices and Smart Systems and Applications of Zhejiang Province Zhejiang UniversityHangzhou 310027China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China

Thermal metamaterial represents a groundbreaking approach to control heat conduction,and,as a crucial component,thermal invisibility is of utmost importance for heat *** the flourishing development of thermal invisibility schemes,they still face two limitations in practical ***,objects are typically completely enclosed in traditional cloaks,making them difficult to use and unsuitable for objects with heat ***,although some theoretical proposals have been put forth to change the thermal conductivity of materials to achieve dynamic invisibility,their designs are complex and rigid,making them unsuitable for large-scale use in real threedimensional(3D)***,we propose a concept of a thermal dome to achieve 3D *** scheme includes an open functional area,greatly enhancing its usability and *** features a reconfigurable structure,constructed with simple isotropic natural materials,making it suitable for dynamic *** performance of our reconfigurable thermal dome has been confirmed through simulations and experiments,consistent with the *** introduction of this concept can greatly advance the development of thermal invisibility technology from theory to engineering and provide inspiration for other physical domains,such as direct current electric fields and magnetic fields.

关键词： Thermal domes Reconfigurable metamaterials Three-dimensional invisibility

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EMI Radiation Prediction of Packages Based on Convolution Neural Network

EMI Radiation Prediction of Packages Based on Convolution Ne...

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2023 International Applied Computational Electromagnetics Society Symposium, ACES-China 2023

作者： Yang, Xiaotian Li, Yan Li, Erping China Jiliang University Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province Zhejiang China Zhejiang University Key Laboratory of Advanced Micro-Nano Electronic Devices & Smart Systems and Applications Zhejiang China

ISBN: (纸本)9781733509657

With the increase of the current operating frequency, the electromagnetic interference (EMI) problem of extra-highspeed electronic equipment and systems becomes more and more complex, and the traditional analysis and design methods cannot efficiently deal with the current EMI problems. Therefore, this paper proposes a method of predicting electromagnetic radiation using a two-dimensional (2-D) convolutional neural network (CNN) in deep learning. This method can quickly and accurately predict the maximum 3-m pin map (PINMAP) package radiation electric field. By comparing the prediction results with the full-wave simulation results, both results are in good agreement, and the CNN prediction time is at the millisecond level. Therefore, the method that can accurately and effectively predict the radiation value has been verified. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Signal interference

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Design of a Double-layer Miniaturized Metamaterial Absorber in 5G Millimeter-wave Band 15

Design of a Double-layer Miniaturized Metamaterial Absorber ...

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15th International Conference on microwave and Millimeter Wave Technology, ICMMT 2023

作者： Wu, Yunxi Li, Yan Li, Erping China Jiliang University Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province Zhejiang China Zhejiang University Key Laboratory of Advanced Micro-Nano Electronic Devices & Smart Systems and Applications Zhejiang China

ISBN: (纸本)9798350338874

A double-layer miniaturized metamaterial absorber based on the indium-tin-oxide (ITO) resistive film in a 5G millimeter-wave band is proposed in this paper. Its core structure is implemented by two layers. The first layer is a glass substrate with ITO resistive film attached, and another ITO is attached to the FR-4 substrate in the second layer. The simulation results reveal that under the conditions of transverse electric or transverse magnetic polarization, the absorption efficiency of the designed structure exceeds 90% in the bandwidth of 23.3GHz ~ 35.2GHz, and reaches the peak of nearly 100% at the resonant point of 28GHz. Further analysis shows that the absorption performance of the incident angle from 0° to 40° can reach more than 90% in the operating frequency, which is relatively stable. © 2023 IEEE.

关键词： Tin oxides

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Superscattering of water waves

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National Science Review 2023年第7期10卷 91-97页

作者： Zijian Qin Chao Qian Lian Shen Xiaoping Wang Ido Kaminer Hongsheng Chen Huaping Wang Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province Institute of Marine Electronics Engineering Ocean College Zhejiang University ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab.of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University ZJU-UIUC Institute Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation Zhejiang University Jinhua Institute of Zhejiang University Zhejiang University Department of Electrical Engineering Technion-Israel Institute of Technology

Inspired by the concept of superscattering in optics,we for the first time theoretically predict and experimentally demonstrate the superscattering phenomenon in water *** subwavelength superscatterer is constructed by multi-layered concentric cylinders with an inhomogeneous depth *** superscatterer breaks the long-held single-channel scattering limit by several times and thus significantly enhances the total scattering *** underlying mechanism originates from the near degeneracy of the resonances of multiple *** fabricate the superscatterer prototype and experimentally measure the near-field patterns,which are consistent with theoretical prediction and numerical *** study opens a new avenue to strengthen water-wave scattering and deepen the understanding in water waves,which can be useful for ocean energy harvesting and harbor protection.

关键词： superscattering water wave metamaterials

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