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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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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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Electromagnetic Wave Dispersion Curve Computation for Quasi-1D Spoof Surface Plasmon Polaritons

Electromagnetic Wave Dispersion Curve Computation for Quasi-...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Jiefeng Zhou Ling Zhang Da Li Er-Ping Li Key Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems and Applications Zhejiang University Hangzhou China

ISBN: (数字)9798350355581

ISBN: (纸本)9798350355598

The quasi-one-dimensional (quasi-1D) spoof surface plasmon polariton (SSPP) provides a new route for optically transparent electronic devices. The dispersion curves can control the electromagnetic wave propagation characteristics of the quasi-1D SSPP by manipulating the geometric parameters. However, the dispersion curves of quasi-1D SSPP have not been analytically derived and thoroughly studied. This paper derives the dispersion curves of the quasi-1D SSPP using equivalent permittivity and permeability methods, which can accurately predict the relationship between wave number and its geometric parameters. The simulation results validate the proposed dispersion curves. Based on the dispersion curves, this paper further presents a broadband optically transparent transmission line, which can achieve high-efficiency transmission from 3.0 to 14.4 GHz.

关键词： Surface plasmon polaritons Simulation Electromagnetic waveguides Geometrical optics Broadband communication Permittivity Dispersion Optical devices Optical waveguides Substrates

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A Complementary Electromagnetic Paradigm for Collaborative Autonomous Vehicles 13

A Complementary Electromagnetic Paradigm for Collaborative A...

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13th Asia-Pacific International Symposium on Electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Li, Ruifeng Liang, Xinglei Zhang, Ling Li, Da Li, Er-Ping Zhejiang University College of Information Science & Electronic Engineering The Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems and Applications Hangzhou310027 China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

With the development of 5G communication and the continuous upgrading of AI algorithms, the realization of collaborative autonomous vehicles (CAVs) is gradually becoming possible. The perception layers of the current CAVs detect information mainly through simultaneous positioning and mapping (SLAM) and prior maps. However, SLAM requires exhaustive computing resources, and prior maps cannot cope with time-varying electromagnetic environments. Therefore, a complementary electromagnetic paradigm for CAVs is proposed, and a simple demo of this paradigm is created using commercial radio frequency identification (RFID) tags. Specifically, this paper takes vehicle localization as a specific application scenario in the absence of GNSS information, showing the great potential of applying this complementary electromagnetic paradigm to the decision layer of CAVs based on electromagnetic characteristic analysis. © 2022 IEEE.

关键词： Autonomous vehicles

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Temporal Neural Encoding Methods for Spiking Neural Networks 13

Temporal Neural Encoding Methods for Spiking Neural Networks

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13th Asia-Pacific International Symposium on Electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Chen, Quankun Li, Da Tao, Tuomin Ma, Hanzhi Li, Erping Zhejiang University The Zhejiang Key Lab. of Advanced Micro/Nano Electronic Devices Smart Systems and Applications Hangzhou China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

Spike neural networks (SNNs) have gained growing attention, and the temporal encoding methods for the signal input are also crucial. Among these encoding algorithms, a suitable and simple encoding method not only affects the performance of the SNNs but also relates to the expansion in hardware. Several high-performance and easily realized encoding algorithms are discussed in this paper. © 2022 IEEE.

关键词： Network coding

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Bayesian Machine Learning for Extracting Parasitic Parameters of GSG Calibration Standards 13

Bayesian Machine Learning for Extracting Parasitic Parameter...

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13th Asia-Pacific International Symposium on Electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Zhou, Jiefeng Zhang, Ling Li, Da Chen, Junhui Wu, Chenghan Jiang, Li Li, Er-Ping Zhejiang University College of Information Science and Electronic Engineering The Zhejiang Key Laboratory of Advanced Micro Nano Electronic Devices & Smart Systems and Applications Hangzhou China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

This paper proposes a method to extract the parasitic parameters of the calibration standards by using the Bayesian optimization algorithm. After several rounds of optimization, the parasitic parameters are optimized so that the calculated value is closest to the full-wave simulation value. The advantage is that only one S-parameter of a known device needs to be used to obtain the parasitic parameters of all calibration standards. Compared with traditional measurement methods, it has the advantages taking less measurement times and coverage of frequency bandwidth. To prove the validity of the technique, the S-parameter of the 4mm microstrip line was simulated as a reference. The extracted parasitic parameters were used in the 16-term error model, the calibration and simulation results are in good agreement up to 100GHz. © 2022 IEEE.

关键词： Scattering parameters

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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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Coupling Path Identification of Conducted EMI in a High-Voltage Discharging Circuit Using Near-Field Scanning 15

Coupling Path Identification of Conducted EMI in a High-Volt...

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

作者： Xie, Yu-Ting Zhang, Ling Chen, Jun-Hui Li, Da Yang, Zhen-Zhong 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 China Academy of Engineering Physics Institute of Electronic Engineering Mianyang China

ISBN: (纸本)9798350338874

Electromagnetic interference (EMI) problems are common and can severely affect the normal function of high-voltage discharge circuits. This paper investigates the EMI issue in a dual-channel high-voltage discharge system, where the high-voltage discharging current of one circuit causes the false triggering of the other low-voltage triggering circuit. To effectively analyze the EMI coupling path, the near-field scanning (NFS) technique is adopted to capture and visualize the current flow path in the discharging process. A useful subtraction method is proposed to eliminate the radiated EMI from the high-voltage discharging current and better visualize the conducted EMI current. According to the NFS results after the subtraction process, the conducted EMI current coupling path can be straightforwardly obtained, and the corresponding mitigation approaches are demonstrated to solve the EMI problem effectively. © 2023 IEEE.

关键词： Timing circuits

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Black-hole-inspired thermal trapping with graded heat-conduction metadevices

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National Science Review 2023年第2期10卷 131-138页

作者： Liujun Xu Jinrong Liu Peng Jin Guoqiang Xu Jiaxin Li Xiaoping Ouyang Ying Li Cheng-Wei Qiu Jiping Huang Department of Physics State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (MOE) Fudan University Department of Electrical and Computer Engineering National University of Singapore Graduate School of China Academy of Engineering Physics School of Materials Science and Engineering Xiangtan University Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang University International Joint Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang The Electromagnetics Academy of Zhejiang University Zhejiang University

The curved space-time produced by black holes leads to the intriguing trapping *** far,metadevices have enabled analogous black holes to trap light or sound in laboratory ***,trapping heat in a conductive environment is still challenging because diffusive behaviors are *** by black holes,we construct graded heat-conduction metadevices to achieve thermal trapping,resorting to the imitated advection produced by graded thermal conductivities rather than the trivial solution of using insulation materials to confine thermal *** experimentally demonstrate thermal trapping for guiding hot spots to diffuse towards the *** heat-conduction metadevices have advantages in energy-efficient thermal regulation because the imitated advection has a similar temperature field effect to the realistic advection that is usually driven by external energy *** results also provide an insight into correlating transformation thermotics with other disciplines,such as cosmology,for emerging heat control schemes.

关键词： thermal trapping graded metadevices imitated advection

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