2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)最新文献_第3页

Variable Impedance Feed Structure for Impulse Radiating Antenna 脉冲辐射天线的变阻抗馈电结构

2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) Pub Date : 2019-09-01 DOI: 10.1109/ICEAA.2019.8879411

Félix Vega-Stavro, F. Albarracin-Vargas

引用次数: 3

An artificial magnetic shield for a volume coil for 7T MRI 一种用于7T MRI体积线圈的人工磁屏蔽

2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) Pub Date : 2019-09-01 DOI: 10.1109/ICEAA.2019.8878996

A. Hurshkainen, K. Lezhennikova, C. Simovski, S. Glybovski

引用次数: 0

Time-Dependent Response of Carbon Nano-Structures 碳纳米结构的时变响应

2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) Pub Date : 2019-09-01 DOI: 10.1109/ICEAA.2019.8879399

D. Gabay, A. Yılmaz, A. Boag, A. Natan

{"title":"Time-Dependent Response of Carbon Nano-Structures","authors":"D. Gabay, A. Yılmaz, A. Boag, A. Natan","doi":"10.1109/ICEAA.2019.8879399","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879399","url":null,"abstract":"The progress of nanotechnology has led to the development of nanometer scale devices such as nano-antennas, molecular junctions, and others. The calculation of such devices' electromagnetic response becomes a challenge as it requires the integration of the classical form of Maxwell's equations with the quantum equations governing the electronic structure. To that end, Time-Dependent Density Functional Theory (TDDFT) reliably predicts the optical and electronic properties of molecules in the presence of external fields. However, most TDDFT formalisms only account for the electrostatic scalar potential, ignoring the presence of induced magnetic fields, and the retardation effects which follow. Disregarding the vector potential leads to an incorrect characterization of electronic structures exceeding certain size-to-wavelength ratio, the wavelength being that of the external electromagnetic field. In this work, the inclusion of induced vector potentials in the time-dependent Kohn-Sham equation is explored in both the Coulomb and Lorentz gauges. Although the Coulomb gauge is the commonly adapted gauge-fixing condition in TDDFT, the Lorentz gauge is shown to be just as effective in characterizing the response of electronic structures, bypassing the need for a projection scheme of the current density, via Helmholtz decomposition. In both gauges, fully incorporating the scalar and vector potentials can be computationally costly due to the retardation effects. Specifically, direct evaluation of the retarded integrals with their intrinsic dependence on past densities creates a computational bottleneck. To overcome this difficulty, highly efficient FFT-based integral methods utilizing multilevel schemes are employed. Carbon systems reaching the nanometric regime are explored in both gauges and various properties, appearing as a consequence of the newly incorporated induced fields, are demonstrated.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125408336","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

On the Practical Effectiveness of the Nonredundant Spherical NF-FF Transformation for Offset Mounted Long AUTs 非冗余球面NF-FF变换在偏移安装长aut中的实际有效性

2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) Pub Date : 2019-09-01 DOI: 10.1109/ICEAA.2019.8879318

F. D’Agostino, F. Ferrara, C. Gennarelli, R. Guerriero, M. Migliozzi

{"title":"On the Practical Effectiveness of the Nonredundant Spherical NF-FF Transformation for Offset Mounted Long AUTs","authors":"F. D’Agostino, F. Ferrara, C. Gennarelli, R. Guerriero, M. Migliozzi","doi":"10.1109/ICEAA.2019.8879318","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879318","url":null,"abstract":"A laboratory assessment of a recently proposed spherical near-field to far-field (NF-FF) transformation technique for a long antenna under test (AUT) mounted in offset configuration, which requires an amount of NF measurements minimum and equal to that needed for the onset mounting, is provided in this work. The interest for this technique is due to the fact that sometimes, for practical limitations, it can be impossible an onset mounting, where the AUT center and the scanning sphere one coincide. In this case, the amount of NF measurements and the corresponding acquisition time required by the traditional spherical NF-FF transformation can remarkably raise, owing to the minimum sphere rule. Instead, in the proposed NF-FF transformation, the massive data necessary for the traditional one are efficiently recovered from the measured nonredundant samples using an optimal sampling interpolation formula, got by suitably exploiting the nonredundant sampling representations and modeling the AUT by a prolate spheroid. Some laboratory results, fully confirming the efficacy of such a nonredundant NF-FF transformation from the practical viewpoint, are reported.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125445581","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

Non-Contact Antenna Characterization via One-Port Network Calibration 通过单端口网络校准的非接触式天线特性

2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) Pub Date : 2019-09-01 DOI: 10.1109/ICEAA.2019.8878968

Seckin Sahin, N. Nahar, K. Sertel

引用次数: 0

Overview of plasma wave studies using the Basic Plasma Science Facility 使用基础等离子体科学设施的等离子体波研究概述

2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) Pub Date : 2019-09-01 DOI: 10.1109/iceaa.2019.8879347

T. Carter, S. Dorfman, J. Robertson, S. Vincena

{"title":"Overview of plasma wave studies using the Basic Plasma Science Facility","authors":"T. Carter, S. Dorfman, J. Robertson, S. Vincena","doi":"10.1109/iceaa.2019.8879347","DOIUrl":"https://doi.org/10.1109/iceaa.2019.8879347","url":null,"abstract":"The Basic Plasma Science Facility (BaPSF) at UCLA is a US national user facility for studies of fundamental processes in magnetized plasmas. The centerpiece of the facility is the Large Plasma Device (LAPD), a 20m long, magnetized linear plasma device1. This LAPD has been utilized to study a number of fundamental processes, including: collisionless shocks2, dispersion and damping of kinetic and inertial Alfvén waves3, compressional Alfvén waves for ion-cyclotron range of frequencies heating4, flux ropes and magnetic rcconnection5, three-wave interactions and parametric instabilities of Alfvén waves6, turbulence and transport7 and interactions of energetic ions and electrons with plasma waves8. A brief overview of research using the facility will be given, followed by a more detailed discussion of two recent studies of the physics of Alfvén waves. Recent experiments have resulted in the first laboratory observation of the parametric instability of shear Alfvén waves9. Shear waves with sufficiently high $omega/Omega_{mathrm{i}}(> 0.6)$ and above a threshold wave amplitude are observed to decay into co-propagating daughter waves; one a shear Alfvén wave and the other a low-frequency quasimode. The observed process is similar to the modulational decay instability.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"274 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126774214","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

Azimuthally Magnetized Circular Ferrite-Dielectric Waveguide: Impact of the Material and Geometry Parameters on the Cut-off Frequencies for the Normal $TE_{0mathrm{n}}$ Modes 方位角磁化圆形铁氧体介质波导:材料和几何参数对正常$TE_{0 mathm {n}}$模式截止频率的影响

2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) Pub Date : 2019-09-01 DOI: 10.1109/ICEAA.2019.8879220

G. Georgiev, M. Georgieva-Grosse

引用次数: 0

A Study on Impact of Component and Module-Level Replacement on Electromagnetic Compatibility Qualification in Nuclear Power Plants 核电站组件级和模块级更换对电磁兼容评定的影响研究

2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) Pub Date : 2019-09-01 DOI: 10.1109/ICEAA.2019.8879276

Dong-Jin Lee, J. Choo, Youngmi Kim

引用次数: 0

A Novel Multi Band Patch Antenna Based on Plotting Exponential Partial Sums in the Complex Plane 一种基于复平面指数部分和的多波段贴片天线

2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) Pub Date : 2019-09-01 DOI: 10.1109/ICEAA.2019.8879082

L. F. Guerrero-Vásquez, Tatiana A. Jara-Quito, Jorge O. Ordoñez-Ordoñez, Mercedes K. Cevallos-Gonzalez, Paul A. Chasi-Pesántez

{"title":"A Novel Multi Band Patch Antenna Based on Plotting Exponential Partial Sums in the Complex Plane","authors":"L. F. Guerrero-Vásquez, Tatiana A. Jara-Quito, Jorge O. Ordoñez-Ordoñez, Mercedes K. Cevallos-Gonzalez, Paul A. Chasi-Pesántez","doi":"10.1109/ICEAA.2019.8879082","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879082","url":null,"abstract":"This document presents the design, simulation and measurement of a new multi-resonant patch antenna, whose shape is based on the graph obtained from the traces of a partial exponential sum in the complex plane. The shapes obtained from these equations are similar to the fractal geometry shapes, that applying to the design of antennas, drift in both Ultra Bandwidth (UWB) and multi-resonance features. In this work we try to verify that the images derived from the exponential sums can have a real application. Using a specific form, the simulation process is detailed to obtain the ideal structure of an antenna that works in the S band (2 - 4 GHz), leaving open the possibility of experimenting with new forms coming from different equations. For the construction and measurement of the antenna, a FR4 substrate with a dielectric constant ${varepsilon_{r}}=4.4$ a thickness $boldsymbol{h}=1.5boldsymbol{mm}$, and a tangent of losses of ${delta}=0.02$ is used. The obtained antenna has an omnidirectional radiation pattern with small variations, an impedance that allows the coupling to $50{Omega}$ and losses by return below the −10dB. This model has two resonance frequencies within the S Band in 2,4GHz and 3,6GHz with bandwidth of 200MHz and 500Mhz respectively.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122035639","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

Fabry-Pérot bianisotropic metasurfaces for perfect anomalous refraction 完美反常折射的双各向异性超表面

2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) Pub Date : 2019-09-01 DOI: 10.1109/ICEAA.2019.8879128

S. Marcus, A. Epstein

{"title":"Fabry-Pérot bianisotropic metasurfaces for perfect anomalous refraction","authors":"S. Marcus, A. Epstein","doi":"10.1109/ICEAA.2019.8879128","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879128","url":null,"abstract":"It has been shown that an easily designed array of Fabry-Pérot etalons can emulate the scattering capability of a theoretical zero-thickness Huygens' metasurface [1]. Each etalon of this “Fabry-Pérot Huygens' Metasurface” (FP-HMS) consists of a parallel plate waveguide filled with two symmetric dielectric layers [Figure 1(a)] to control the transmission and reflection coefficients through it. These coefficients are those obtained for the equivalent zero-thickness structure abstractly characterized by a periodic surface electric impedance $Z_{se}$ and surface magnetic admittance $Y_{sm}$ [2]. An FP-HMS analytically designed (without resort to full-wave solvers) to alter the direction of a plane wave passing through it [Figure 1(b)] was shown both analytically and numerically (CST) to produce this desired anomalous refraction [1], and to provide results fully consistent with the ideal zero-thickness Huygens' metasurface [2]. However, the designed scattering necessarily included reflected components [see interference pattern in Figure 1(c)], so that a portion of the incident energy was lost to spurious scattering.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122130994","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