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2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)最新文献

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A Tunable Bandpass-to-Bandstop Filter Using Memristor and Varactors 使用忆阻器和变容管的可调谐带通带阻滤波器
2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) Pub Date : 2020-12-07 DOI: 10.1109/NEMO49486.2020.9343581
Guokai Zhao, Bin You
{"title":"A Tunable Bandpass-to-Bandstop Filter Using Memristor and Varactors","authors":"Guokai Zhao, Bin You","doi":"10.1109/NEMO49486.2020.9343581","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343581","url":null,"abstract":"This paper presents a tunable bandpass-to-bandstop filter using memristor and varactors for 5G wireless communications. Memristor has hard switching characteristics and behaves great linearity at high frequencies, thus it can be potentially used as an RF switch to achieve the bandpass-to-bandstop transformation. The proposed filter employs stub-loaded stepped-impedance resonator with four varactors and a memristor. The center frequency of the proposed filter can be flexibly tuned by adjusting varactors. The tuning range almost covers 5G frequency band (3.4 to 3.6 GHz) in both the bandpass and bandstop mode. The simulated results show that return loss is better than 22.18 dB in the bandpass mode and rejection level of bandstop mode is higher than 21.34 dB.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127859789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Efficient Multilevel Fast Physical Optics Method for Calculating the Scattered Field 计算散射场的高效多能级快速物理光学方法
2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) Pub Date : 2020-12-07 DOI: 10.1109/NEMO49486.2020.9343658
Feng-hua Song, Yumao Wu, Yaqiu Jin
{"title":"The Efficient Multilevel Fast Physical Optics Method for Calculating the Scattered Field","authors":"Feng-hua Song, Yumao Wu, Yaqiu Jin","doi":"10.1109/NEMO49486.2020.9343658","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343658","url":null,"abstract":"For the electrically large coated scatterers, the multilevel fast physical optics (MLFPO) is proposed to accelerate the computation of the physical optical scattered fields. This method is based on the quadratic patch subdivision and multilevel technology. The surface is discretized by quadratic patches and the amplitude and function of physical optical integration are approximated by Lagrange interpolation polynomials. Finally, numerical example shows the effectiveness of the MLFPO method in accuracy and efficiency, which make a comparison between our method and the Gordon method.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126765813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Numerical Studies of High Power Microwave Argon breakdown based on SETD method 基于SETD方法的大功率微波氩击穿数值研究
2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) Pub Date : 2020-12-07 DOI: 10.1109/NEMO49486.2020.9343408
Lin Wang, H. Bao, D. Ding, Rushan Chen
{"title":"Numerical Studies of High Power Microwave Argon breakdown based on SETD method","authors":"Lin Wang, H. Bao, D. Ding, Rushan Chen","doi":"10.1109/NEMO49486.2020.9343408","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343408","url":null,"abstract":"This article concentrates on the high-power microwave (HPM) argon breakdown process and behaviors under different conditions. The electromagnetic (EM)–plasma interactions in the breakdown process are modeled by a nonlinearly coupled Maxwell’s equations and plasma fluid system equations and solved by the spectral-element time-domain (SETD) method. Meanwhile, dominant physical mechanisms (ionization versus diffusion) were accurately captured during the plasma formation process. Our research provides theoretical guidance for the understanding physical mechanism of HPM breakdown.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123161252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
An Artificial Neural Network Based Design of Triple-Band Microstrip Patch Antenna for WLAN Applications 基于人工神经网络的无线局域网三波段微带贴片天线设计
2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) Pub Date : 2020-12-07 DOI: 10.1109/NEMO49486.2020.9343490
Jing Rui Wang, W. Liu, M. Tong
{"title":"An Artificial Neural Network Based Design of Triple-Band Microstrip Patch Antenna for WLAN Applications","authors":"Jing Rui Wang, W. Liu, M. Tong","doi":"10.1109/NEMO49486.2020.9343490","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343490","url":null,"abstract":"With the development of communication system, multi-band antenna becomes more and more significant. In this paper, a triple-band microstrip patch antenna using artificial neural network techniques to optimize working bandwidth is proposed. The antenna is mainly composed of two metal patches and FR4 substrate. Three operating bands with the center frequency of 1.52 GHz (1.47 1.57 GHz), 2.46 GHz (2.43 2.48 GHz) and 2.79 GHz (2.78 2.81 GHz). Artificial neural network (ANN) model is trained and tested to optimize the bandwidth of the antenna, the simulation software HFSS is used to obtain 162 data sets of proposed antenna with four parameters related to patch dimension and substrate materials. According to the final test results, the average percentage error was within the acceptable range. The antenna also performs well in terms of gain. The antenna can be effectively used for WLAN applications.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114148521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A Regularization Scheme Based on Gaussian Mixture Model for EM Data Inversion 基于高斯混合模型的电磁数据反演正则化方案
2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) Pub Date : 2020-12-07 DOI: 10.1109/NEMO49486.2020.9343382
Xiaoqian Song, Maokun Li, A. Abubakar
{"title":"A Regularization Scheme Based on Gaussian Mixture Model for EM Data Inversion","authors":"Xiaoqian Song, Maokun Li, A. Abubakar","doi":"10.1109/NEMO49486.2020.9343382","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343382","url":null,"abstract":"In this paper, we study parameter reconstruction from the perspective of probability, which is friendly to introduce prior information about the target region. The unknown contrast is assumed to follow Gaussian mixture model (GMM) and variational inference machinery is applied to realize the inversion. To decouple the contrast of different pixels, we consider the approximate posterior distribution from the perspective of optimization, and the inversion can be formulated as optimizing the combination of data misfit and prior information that works as the regularization.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114248385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Deep Learning Based Attack on Phase-Truncated Optical Encoding 基于深度学习的相位截断光学编码攻击
2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) Pub Date : 2020-12-07 DOI: 10.1109/NEMO49486.2020.9343452
Lina Zhou, Xudong Chen, Wen Chen
{"title":"Deep Learning Based Attack on Phase-Truncated Optical Encoding","authors":"Lina Zhou, Xudong Chen, Wen Chen","doi":"10.1109/NEMO49486.2020.9343452","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343452","url":null,"abstract":"We apply the learning based attack to study the vulnerability of phase-truncated optical encoding scheme. By using a number of ciphertext-plaintext pairs to train a designed learning model, an attacker can effectively analyze the vulnerability of optical encryption scheme based on phase truncation. The learning based attacks for phase-truncated optical encoding can retrieve unknown plaintexts from the given ciphertexts, which can avoid the retrieval of security keys and the design of complex phase retrieval algorithms. It is demonstrated that the learning based attack can provide a promising approach for vulnerability analysis of phase-truncated optical cryptosystems.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125153313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Investigation of Mutual Coupling Reduction in Base Station Antenna Array 减少基站天线阵相互耦合的研究
2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) Pub Date : 2020-12-07 DOI: 10.1109/NEMO49486.2020.9343514
Yiran Da, Xiaoming Chen
{"title":"Investigation of Mutual Coupling Reduction in Base Station Antenna Array","authors":"Yiran Da, Xiaoming Chen","doi":"10.1109/NEMO49486.2020.9343514","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343514","url":null,"abstract":"Mutual couplings in base station array antennas have aroused a great deal of attentions. In this paper, the several decoupling methods are applied to broadband cross-dipole antenna arrays and the corresponding performances are analyzed. It is shown that, for fixed element separation, cross-dipole arrays with compact elements and low profile tend to have good isolation.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122526571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Implementation Method of Anti Electromagnetic Interference in Identical and Adjacent Frequency for the Data link of UAV 无人机数据链抗同频邻频电磁干扰的实现方法
2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) Pub Date : 2020-12-07 DOI: 10.1109/NEMO49486.2020.9343564
Min Zhao, T. Xu, Dongxiao Zhang, Xing Zhou, E. Cheng, Xijun Zhang, S. Gao, Yazhou Chen
{"title":"Implementation Method of Anti Electromagnetic Interference in Identical and Adjacent Frequency for the Data link of UAV","authors":"Min Zhao, T. Xu, Dongxiao Zhang, Xing Zhou, E. Cheng, Xijun Zhang, S. Gao, Yazhou Chen","doi":"10.1109/NEMO49486.2020.9343564","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343564","url":null,"abstract":"The data link, which is the most important part of unmanned aerial vehicle (UAV), is easily affected by external electromagnetic interference (EMI) in identical and adjacent frequency. To deal with the problem of EMI in frequency band, a method that is early warning and then adopts frequency hopping or other measures is proposed, according to operating frequency band of the data link, the radiation effect experiments on a certain type of UAV’s data link under different flight distance are carried out. The experimental results reveal the dynamic range of lost-link thresholds of the data link, on the basis, the suitable EMI monitoring device installed UAV is designed. Several state parameters of the data link such as error rate, receiving auto gain control (AGC) and signal to noise ratio (SNR) are described, and characteristic of the lost-link threshold and the above three parameters in early warning state and lostlink state respectively is compared and analyzed in terms of variety range, 6dB early warning or not, stability of value and correlation with interfering frequency and operating signal power. Finally, a parameter with the lowest uncertainty is determined as the prediction criterion of the data link suffered by EMI, and when external interfering signal power reaches between the early warning value and lost link threshold, the corresponding measures will be activated to protect UAV’s data link from interruption.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132691535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
An H-LU Preconditioner for the Hybrid Finite Element-Bomdaty Integral 有限元-弹体混合积分的H-LU预条件
2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) Pub Date : 2020-12-07 DOI: 10.1109/NEMO49486.2020.9343483
Rui-Qing Liu, Ming-lin Yang, Biyi Wu, X. Sheng
{"title":"An H-LU Preconditioner for the Hybrid Finite Element-Bomdaty Integral","authors":"Rui-Qing Liu, Ming-lin Yang, Biyi Wu, X. Sheng","doi":"10.1109/NEMO49486.2020.9343483","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343483","url":null,"abstract":"A flexible and efficient $mathcal{H}$-LU-based preconditioner ($mathcal{H}$-LU-P) is presented for the hybrid finite element-boundary integral-multilevel fast multipole algorithm (FE-BI-MLFMA) for solving 3D scattering by inhomogeneous objects in this paper. The formulation of FE-BI is firstly approximated by using locally approximated integral operators for the BI part to construct a FEM-ABC based precondition matrix. Then the precondition matrix equation is solved by the nested dissection (ND) accelerated $mathcal{H}$-LU-based fast direct solver. Performance of the $mathcal{H}$-LU-P is studied numerically for different problems, including the quasi-static problem, 2D extended and 3D extended electrodynamic problems, etc. Numerical experiments show the $mathcal{H}$-LU-P has an O(NlogN) memory complexity and an O(Nlog2N) CPU time complexity for the quasi-static, the 2D extended lossless and the 3D extended lossy problems. For the 3D extended lossless problems, the complexity is larger due to the increasing rank of the $mathcal{H}$-LU, but it still outperforms alternative direct solvers, such as the popular multifrontal-based solver MUMPS. Large realistic scattering problems with more than ten million unknowns are calculated, including a honeycomb structure with 8100 elements, showing the capability and efficiency of our proposed preconditioner.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133914754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Sequential-Phase Fed Dual-Band Dual-Circular-Polarized Patch Antenna for Ka-Band Satellite Communications 一种用于ka波段卫星通信的顺序相位馈电双频双圆极化贴片天线
2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) Pub Date : 2020-12-07 DOI: 10.1109/NEMO49486.2020.9343577
Hongfei Liu, Yejun He, Long Zhang, Wei He
{"title":"A Sequential-Phase Fed Dual-Band Dual-Circular-Polarized Patch Antenna for Ka-Band Satellite Communications","authors":"Hongfei Liu, Yejun He, Long Zhang, Wei He","doi":"10.1109/NEMO49486.2020.9343577","DOIUrl":"https://doi.org/10.1109/NEMO49486.2020.9343577","url":null,"abstract":"In this paper, a dual-band dual-circular-polarized patch antenna for Ka-band satellite communications is presented. It integrates 2 2 aperture-coupled corner-truncated microstrip patch antenna elements and the microstrip feeding network provides a good amplitude and phase for the subarrays. By using sequential rotation technique, it achieves good impedance bandwidth and axial ratio bandwidth, which covers the uplink frequencies (30-31 GHz) and downlink frequencies (20-21 GHz) of Ka-band satellite communications. Since the elements are placed within an appropriate range, the two ports are well isolated. The detailed design process is given in this paper, and good simulation and measured results are obtained.","PeriodicalId":305562,"journal":{"name":"2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134430090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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