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Characterizing Ultra-Wideband Scattering from Penetrable Objects Using a Stabilized and Well-Conditioned TDIE with Laguerre Polynomials

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IEEE Transactions on Antennas and Propagation 2025年第6期73卷 4116-4121页

作者： Bai, Rongchuan Zhu, Ming-Da Zhang, Haoxuan Du, Zhengwei Chen, Zhe Huang, Li Xie, Hao Leng, Jianxing Yin, Wen-Yan Zhejiang University Innovative Institute of Electromagnetic Information and Electronic Engineering College of Information and Electronic Engineering Hangzhou310058 China Zhejiang University Interdisciplinary Student Training Platform for Marine Areas Hangzhou310027 China Xidian Univer-sity School of Electronic Engineering Shaanxi Xi'an710071 China Purple Mountain Laboratories Nanjing211111 China Zhejiang University Key Laboratory of Advanced Micro Nano Electronic Devices and Smart Systems of Zhejiang Province Innovative Institute of Electromagnetic Information and Electronic Integration College of Infor-mation Science and Electronic Engineering Hangzhou310058 China Hangzhou City University School of Information and Electrical Engi-neering Hangzhou310015 China Zhejiang University Ocean College Zhoushan316021 China

A novel approach is proposed to solve ultra-wideband scattering problem of dielectric objects, which employs the time-domain integral equation (TDIE) method. The frequency band spans from ultra-low frequency (10-25 Hz) to microwave frequency. The application of the Calderón preconditioner ensures that the impedance matrix is well-conditioned. Furthermore, the Filon-type method is integrated into the Calderón pre-conditioner to guarantee the accuracy of the oscillatory integral. In addition, by incorporating a block-matrix constraint condition, we obtain stabilized and well-conditioned dielectric formulations based on marching-on-in-degree (MOD) method. Expanding on these techniques, we propose a universal static error current subtraction (SECS) method, characterized by its simplicity of implementation, to attain an accurate solution for ultra-wideband scenarios. Notably, the accurate results can be obtained from ultra-low to high frequencies through single temporal simulation. Numerical examples demonstrate that the proposed approach is able to achieve stable and accurate ultra-broadband solutions. © 1963-2012 IEEE.

关键词： Ultra-wideband (UWB)

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Design and Analysis of a Novel Miniaturized Ultra-Thin Wide-Band Metamaterial Absorber

Design and Analysis of a Novel Miniaturized Ultra-Thin Wide-...

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

作者： Ma, Jingnan Li, Yan Li, Erping School of Electronics and Information Engineering Hebei University of Technology Tianjin China China Jiliang University Key Lab. of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province China Zhejiang China Zhejiang University Key Laboratory of Advanced Micro-Nano Electronic Device and Smart Systems and Applications Zhejiang China

ISBN: (纸本)9781733509657

The volume of existing metamaterial absorber (MMA) is not small enough to be applied in miniaturized devices such as chip level. To solve this problem, a miniaturized ultrathin wide-band MMA is proposed in this paper. The thickness of proposed MMA is 1.1mm with a absorption rate of 99.6% at 19.7GHz. This paper also analyzes the influence of parameters of the proposed MMA on the absorption performance and proves that it has a certain tunability of the absorption band. By comparing with other works, the MMA proposed in this paper realizes the miniaturization of the structure while ensuring ultra-wideband. This benefit offers a novel approach to address the problem of difficult loading electromagnetic shielding structures in miniaturized chip designs. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Electromagnetic shielding

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Novel Surface Acoustic Wave Strain Sensor with Enhanced High-Temperature Performance and Resistance to Aging

Novel Surface Acoustic Wave Strain Sensor with Enhanced High...

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2023 International Congress on Ultrasonics, ICU Beijing 2023

作者： Zhang, Jikai Mu, Danyu Zhang, Zichao Jin, Hao Chen, Jinkai Xuan, Weipeng Dong, Shurong Luo, Jikui Zhejiang University Hangzhou310027 China Innovation and Research Institute of HIWING Technology Academy Beijing100074 China Zhejiang University Key Laboratory of Micro-nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science & Electronic Engineering Hangzhou310027 China Ministry of Education Key Laboratory of RF Circuits and Systems College of Electronics & Information Hangzhou Dianzi University Hangzhou310027 China Zhejiang University Key Laboratory of Collaborative sensing and autonomous unmanned systems of Zhejiang Province College of Information Science & Electronic Engineering Hangzhou310027 China

Surface acoustic wave (SAW) sensors based on Langasite (La3Ga5SiO14, LGS) have emerged as promising candidates for high-temperature strain measurement in passive wireless systems. However, limitations of strain transfer at temperatures above 800°C have hindered the repeatability of sensors due to temperature-induced effects. For instance, the aging of conventional high-temperature adhesives at elevated temperatures restricts the strain transfer between the measured object and the sensor. Moreover, materials like Inconel-600 exhibit a coefficient of thermal expansion significantly larger than the LGS, leading to thermal strains caused by thermal expansion mismatch beyond the maximum range of existing SAW strain sensors. Such factors increase the likelihood of sensor damage during a test. In this paper, we present a novel SAW sensor utilizing an ultra-thin LGS substrate encapsulated within a ceramic coating, which transfers strain by exerting pressure on both sides of the sensor. The strain sensor is mounted on an equal-strain beam inside a high-temperature furnace. The ceramic coating is not tightly bonded to the sensor, thereby mitigating the thermal expansion mismatch between the sensor and the beam at high temperatures. Furthermore, the ceramic coating can withstand large strain caused by thermal expansion while maintaining pressure on the sensor. This innovative SAW sensor enables repeat strain tests up to 800°C, including both calibration and formal tests. The measured strain exhibits an error of less than 5% compared to a standard strain gauge, demonstrating the sensor's enhanced performance and reliability. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Ceramic materials

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The application value of H-reflex induced by electrical stimulation of the sacral nerve at the S3 foramen in stimulus parameter programming

The application value of H-reflex induced by electrical stim...

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2024 International Conference on Next Generation electronics and Photonics, INGEP 2024

作者： Min, Yu Jiang, Haofei Jin, Hao Yu, Yanlan Ding, Guoqing Jiang, Haihong College of Information Science and Electronic Engineering Zhejiang University Hangzhou China The First Clinical Medical School of Wenzhou Medical University School of Information and Engineering Wenzhou Medical University Wenzhou China Key Lab. of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang Hangzhou China Sir Run Run Shaw Hospital Zhejiang University School of Medicine Hangzhou China

Although manufacturers of sacral nerve stimulators and related research have provided many guiding opinions on the programming values of stimulation parameters, the stimulation parameters used for long-term treatment of patients are still largely influenced by the experience of doctors and the subjective feelings of patients. We found a high positive correlation between the appearance and amplitude growth trend of the H-reflex induced by S3 nerve root stimulation, the stimulation amplitude corresponding to the inflection point, and the subjective sensation threshold and pain threshold of patients who underwent the first phase of implantable stimulatory surgery, through electromyography collection. Based on this, we believe that the information on the H-reflex triggered by S3 nerve root stimulation will provide a more intuitive and quantifiable non-invasive way for doctors to assist in determining the appropriate stimulator amplitude for long-term treatment of patients. This will help reduce unnecessary pain and potential permanent nerve damage risks that may occur to patients during parameter programming and debugging processes. Especially when facing patients with communication barriers or lack of cooperation, it is more meaningful. © Published under licence by IOP Publishing Ltd.

关键词： Electromyography

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Design of Wideband Electromagnetic Absorbers Based on Deep Learning

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

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Robotics, Intelligent Control and Artificial Intelligence (RICAI), International Conference on

作者： Wan Ji Yan Li Erping Li 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: (数字)9798331541699

ISBN: (纸本)9798331541705

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.

关键词： Deep learning Training Design methodology Multilayer perceptrons Electromagnetic absorbers Electromagnetic compatibility Structural engineering Electromagnetics Biological neural networks Wideband

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Efficient evolution framework for chirality control in non-Hermitian systems with adiabaticity engineering

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Physical Review B 2024年第6期110卷 064308-064308页

作者： Dong Wang Wen-Xi Huang Bo Zhou Wenduo Yu Pei-Chao Cao Yu-Gui Peng Zheng-Yang Zhou Hongsheng Chen Xue-Feng Zhu Ying Li State Key Laboratory of Extreme Photonics and Instrumentation Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang International Joint Innovation Center The Electromagnetics Academy at Jinhua Institute of Zhejiang University Shaoxing Institute of Zhejiang University School of Physics and Innovation Institute Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of Physics

The eigenvalue of a non-Hermitian Hamiltonian often forms a self-intersecting Riemann surface, leading to a unique mode conversion phenomenon when the Hamiltonian evolves along certain loop paths around an exceptional point (EP). However, two fundamental problems exist with the conventional scheme of EP encircling: the speed of mode conversion is restricted by the adiabatic requirement, and the chirality cannot be freely controlled. Here, we introduce a method which dynamically engineers the adiabaticity in the evolution of non-Hermitian Hamiltonians that allows for both chiral and nonchiral mode conversion on the same path. Our method is based on quantifying and controlling the instantaneous adiabaticity, allowing for nonuniform evolution throughout the entire path. We apply our method into the microwave waveguide system and by optimizing the distributed adiabaticity along the evolution loop, we achieve the same quality of mode conversion as conventional quasiadiabatic evolution in only one-fourth of the time. Our approach provides an on-demand solution to address the speed and chirality challenges associated with EP encircling, which does not depend on specific model. It also facilitates the dynamic manipulation and regulation of nonadiabatic processes, thereby accelerating the operation and allowing for a selection among various mode conversion patterns.

关键词： Photonics Non-Hermitian systems PT-symmetry

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Negative Conductivity Induced Reconfigurable Gain Metasurfaces and Their Nonlinearity

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Physical Review Letters 2024年第11期133卷 113801页

作者： Xiaoyue Zhu Chao Qian Erping Li Hongsheng Chen ZJU-UIUC Institute Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute of Zhejiang University

The past decades have witnessed the rapid development of metamaterials and metasurfaces. However, loss is still a challenging problem limiting numerous practical applications, including long-range wireless communications, superscattering, and non-Hermitian physics. Recently, great effort has been made to minimize the loss, however, they are too complicated for practical implementation and still restricted by the theoretical limit. Here, we propose and experimentally realize a tunable gain metasurface induced by negative conductivity, with deep theoretical analysis from scattering theory and equivalent circuits. In the experiment, we create metasurface samples embedded with tunable negative (or positive) conductivity to achieve adjustable gain (or loss). By varying the control bias voltages, the metasurfaces can reflect incident waves with additional controllable gain. Interestingly, we find the gain metasurfaces inherently pose nonlinearities, which are beneficial for nonlinear optics and microwave applications, particularly for the nonlinear activation of wave-based neural networks.

关键词： Electromagnetic waves & oscillations Gain properties of lasers Metamaterials Metasurfaces Nonlinear optics

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A Novel Miniaturized Dual-band Frequency Selective Surface 13

A Novel Miniaturized Dual-band Frequency Selective Surface

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

作者： Xu, Shaojie Li, Yan Fang, Lidan Jin, Ning Sun, Zhe Yu, Heyuan Lei, Xiaoyong Huo, Shuyun Li, Erping Li, Bingheng China Jiliang University Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province Zhejiang China Hebei University of Technology College of Electronics & Information Engineering Tianjin China Key Laboratory of Advanced Micro-Nano Electronic Devices & Smart Systems and Applications Zhejiang China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

This paper presents a novel frequency selective surface (FSS) structure with miniaturized, low-frequency ratio. The proposed FSS is composed by cascading a curved cross ring and a double square ring (DSL)and is centrosymmetric. It exhibits the stable performance against the variation of the incident angles from 0° to 60° for both TE and TM polarizations. © 2022 IEEE.

关键词： Frequency selective surfaces

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Impact of the Interconnection Structure on RRAM-Based Crossbar Array in Neuromorphic Chip 13

Impact of the Interconnection Structure on RRAM-Based Crossb...

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

作者： Fang, Lidan Li, Yan Xu, Shaojie Jin, Ning Yu, Heyuan Sun, Zhe Lei, Xiaoyong Huo, Shuyun Li, Erping Li, Bingheng China Jiliang University Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province Zhejiang China Hebei University of Technology College of Electronics & Information Engineering Tianjin China Key Laboratory of Advanced Micro-Nano Electronic Devices & Smart Systems and Applications Zhejiang China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

In this paper, the Izhikevich neuron model is used to simulate the spike signal, and a complete unit-cell equivalent circuit model of the RRAM-based crossbar array including parasitic effects is proposed. By changing the interconnection width, array size, and the RRAM resistance value, influences of the interconnection structure on the transmission characteristics of spike signals in the RRAM-based crossbar array for neuromorphic chips are analyzed. The simulation results show that the IR drop and crosstalk caused by the parasitic RLC components may be the main noise source that changes the operating voltage. Therefore, when the demand is met, the accuracy can be improved by changing the above-mentioned factors. © 2022 IEEE.

关键词： RRAM

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Rapid FSS Design Method Based on Fourier Transform

Rapid FSS Design Method Based on Fourier Transform

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Qiu, Huanran Han, Jiaqi Feng, Qiang Xi, Rui Li, Ying Chen, Hongsheng Zheng, Bin Li, Long Xidian University Hangzhou Institute of Technology Hangzhou311200 China Xidian University Key Laboratory of High-Speed Circuit Design EMC of Ministry of Education School of Electronic Engineering Xi'an710071 China The Electromagnetics Academy Zhejiang University Zhejiang University International Joint Innovation Center Haining314400 China Key Lab of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua China Institute of Zhejiang University Zhejiang University Jinhua321099 China Shaoxing Institute of Zhejiang University Zhejiang University Shaoxing312000 China

ISBN: (纸本)9798350375909

This article presents a rapid frequency selective surface (FSS) design method based on Fourier transform. The method aims to overcome the complexity and reduce the time consumption associated with the massive input simulation datasets in traditional design processes, providing an efficient and automated design solution. By introducing Fourier transform, the amount of simulation datasets can be significantly simplified, enhancing the speed and accuracy of neural network training. The method improves precision and speed in handling tasks with multiple parameters, offering an effective tool for fast FSS design. With the aid of neural network construction, users only need to input the desired simulation result curve, and the neural network model will quickly output optimal FSS structure parameters. This approach ensures design accuracy and stability while greatly increasing the efficiency of FSS design. © 2024 IEEE.

关键词： Neural network models

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