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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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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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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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Simulating Maxwell-Schrodinger Equations by High-Order Symplectic FDTD Algorithm

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IEEE JOURNAL ON MULTISCALE AND MULTIPHYSICS COMPUTATIONAL TECHNIQUES 2019年 4卷 143-151页

作者： Xie, Guoda Huang, Zhixiang Fang, Ming Sha, Wei E., I Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei China Key Laboratory of Micro-Nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science and Electronic Engineering Zhejiang University Hangzhou China

A novel symplectic algorithm is proposed to solve the Maxwell Schrodinger (M-S) system for investigating light-matter interaction. Using the fourth-order symplectic integration and fourth-order collocated differences, M-S equations are discretized in temporal and spatial domains, respectively. The symplectic finite-difference time-domain (SFDTD) algorithm is developed for accurate and efficient study of coherent interaction between electromagnetic fields and artificial atoms. Particularly, the Dirichlet boundary condition is adopted for modeling the Rabi oscillation problems under the semiclassical framework. To implement the Dirichlet boundary condition, image theory is introduced, tailored to the high-order collocated differences. For validating the proposed SFDTD algorithm, three-dimensional numerical studies of the population inversion in the Rabi oscillation are presented. Numerical results show that the proposed high-order SFDTD(4, 4) algorithm exhibits better numerical performance than the conventional FDTD(2, 2) approach at the aspects of accuracy and efficiency for the long-term simulation. The proposed algorithm opens up a promising way toward a high-accurate energy-conservation modeling and simulation of complex dynamics in nanoscale light-matter interaction.

关键词： Maxwell Schrodinger (M-S) equations nanoscale light-matter interaction Rabi oscillation symplectic finite-difference time-domain (SFDTD)

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Absorptive-Material-Based Structure for Suppressing Unwanted Radiation in Chip-Packages 13

Absorptive-Material-Based Structure for Suppressing Unwanted...

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

作者： Xing, Jiaqi Liang, Xinglei Fan, Yudi Zhang, Ling Li, Da Li, Er-Ping Zhejiang University College of Information Science & Electronic Engineering ZJU-UIUC Institute The Zhejiang Key Lab. of Advanced Micro/Nano Electronic Devices Smart Systems and Applications Hangzhou China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

In this paper, a double-layer structured absorptive material for solving the electromagnetic radiation problems in chip-packages is proposed. This low-profile absorber structure is composed of two flat layers where the lower layer is made of absorbing material with high relative permittivity, while the upper layer is made of material with low relative permittivity to better meet the requirements of wide impedance matching. This structure is firstly designed based on theories and full-wave simulations. Then it is fabricated and applied to different absorbing materials working in the frequency range of 20-40GHz to suppress the radiation in a practical chip-package model. Finally, the effectiveness and universality of this structure are verified through measurements of the radiation suppression effect with different absorbing material settings. © 2022 IEEE.

关键词： Electromagnetic compatibility

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A kirigami-based reconfigurable metasurface for selective electromagnetic transmissionmodulation

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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 TE/TM independent polarizer based on grapheme interferometer 16

A TE/TM independent polarizer based on grapheme interferomet...

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16th International Conference on Optical Communications and Networks, ICOCN 2017

作者： Zhang, Hongjun Wao, Shaoliang Ye, Ziwei Li, Er-Ping Hao, Ran Key Laboratory of Micro/Nano Electronic Devices and Smart Systems College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China

ISBN: (纸本)9781538632734

We proposed a versatile polarizer independent with the polarization of the incident light by coating the graphene on the silicon waveguide. The proposed polarizer works at two operation states: TE-pass state and TM-pass state, where the variation of mode effective index is different for the two states. Therefore it is able to combine TE-pass and TM-pass polarizer into one single component. The proposed device owns a compact size of 69.65μm∗2μm, high extinction ratio 19.15dB for TE-pass polarizer and 20.68dB for TM-pass polarizer, respectively. Furthermore, this device exhibits a wide working bandwidth from 1500nm to 1800nm. © 2017 IEEE.

关键词： Graphene

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ESD pulse width effect on RC-triggered NMOS with power on or off 1

ESD pulse width effect on RC-triggered NMOS with power on or...

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1st Annual International EOS/ESD Symposium on Design and System, IEDS 2020

作者： Zhu, Xinyu Yu, Fangjun Shen, Hongyu Xu, Zekun Dong, Shurong Key Laboratory of Micro-nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science Electronic Engineering Zhejiang University Hangzhou310027 China

The robustness of RC-triggered NMOS clamp in 28nm process is significantly reduced under the condition of long pulse width and power on. The simulation results show that the device faces the risk of turning off in the... 详细信息

ISBN: (纸本)9781585373284

关键词： Simulation Turning Electrostatic discharges Robustness Delays Clamps Transient analysis

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Modeling and Analysis of a Large-Scale Memristor Crossbar Array for Neuromorphic Chip 9

Modeling and Analysis of a Large-Scale Memristor Crossbar Ar...

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9th IEEE International Symposium on microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, MAPE 2022

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

ISBN: (数字)9781665427753

ISBN: (纸本)9781665427753

This paper presents a complete equivalent circuit model of a large memristor crossbar array, including parasitic capacitance, inductance, and resistance. By changing the rise time of the input signal and monitoring the output voltage of different output ports, signal integrity (SI) problems such as crosstalk, and IR voltage drop in the memristor crossbar array are analyzed. The simulation results show that with the decrease of the rise time, the electromagnetic effect will become obvious, which will lead to the crosstalk ripple and distortion of the output signal becoming serious. And as the output port moves away from the input, the IR voltage drop increases with the increase of the coupling elements. This will point the direction for improving the performance of memristor crossbar arrays. Furthermore, different from conventional signals, we propose to simulate spiking signals using the Izhikevich neuron model for more accurate analysis. © 2022 IEEE.

关键词： Memristors

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Geometric and Material Uncertainties Quantification of Electromagnetic-Thermal Simulation Using Stochastic Leapfrog ADI-FDTD Method

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IEEE Transactions on Electromagnetic Compatibility 2025年

作者： Zhai, Menglin Jin, Shengling Pei, Rui Donghua University College of Information Science and Technology Shanghai 201620 China Ministry of Education Engineering Research Center of Digitized Textile and Fashion Technology Shanghai 201620 China Xi'an Jiaotong-Liverpool University School of Advanced Technology Suzhou 215123 China Zhejiang University Innovative Institute of Electromagnetic Information and Electronic Integration Key Lab of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science and Electronic Engineering Hangzhou 310027 China

In this article, a stochastic leapfrog alternating implicit finite-difference time-domain (FDTD) method is proposed for solving problems involving electromagnetic and thermal fields. The proposed stochastic solver considers the random variations in not only material properties (primarily due to measurement limitations and material aging) but also geometry (mainly due to manufacturing errors and material deformation). The unconditional stability of the proposed stochastic method is further demonstrated with the von Neumann method. Finally, numerical examples of a microstrip bandpass filter, multilayered biological tissue model, and printed circuit board in a shielding enclosure with both geometric and material uncertainties are performed. Simulation results show good accuracy and efficiency of the proposed method when compared to the traditional stochastic FDTD and the Monte Carlo method for problems with fine structures in arbitrary directions. © 1964-2012 IEEE.

关键词： Electromagnetic-thermal simulation Monte Carlo (MC) stochastic leapfrog alternating direction-implicit finite-difference time-domain (S-leapfrog ADI-FDTD) method uncertainty quantification

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