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2016 URSI International Symposium on Electromagnetic Theory (EMTS)最新文献

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Evaluation method for in-situ electric field of different TMS coils in human brain 人脑不同TMS线圈原位电场的评价方法
2016 URSI International Symposium on Electromagnetic Theory (EMTS) Pub Date : 2016-09-19 DOI: 10.1109/URSI-EMTS.2016.7571449
A. Hirata, M. Iwahashi, I. Laakso
{"title":"Evaluation method for in-situ electric field of different TMS coils in human brain","authors":"A. Hirata, M. Iwahashi, I. Laakso","doi":"10.1109/URSI-EMTS.2016.7571449","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2016.7571449","url":null,"abstract":"This study proposes a method to evaluate focal stimulation in the target area of the brain for non-invasive electro-/magneto-stimulation. The feasibility of three different coils used in transcranial magnetic stimulation (TMS) is considered for clinical applications. In the second part, we investigate the induced electric fields in the brain using ten individual anatomically realistic models of the head. The group-average electric fields are studied using a registration procedure to map each individual's brain to the standard brain space. From computational results, it is difficult to localize the induced electric field in the target area of the brain due to the morphological variability of the human brain, at least for the coils considered herein. The evaluation method proposed is useful for future design of the coils.","PeriodicalId":400853,"journal":{"name":"2016 URSI International Symposium on Electromagnetic Theory (EMTS)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122012834","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
Porcupic concentrators and bulbic cloaks in planar configuration 平面结构的豪猪状聚光器和球状斗篷
2016 URSI International Symposium on Electromagnetic Theory (EMTS) Pub Date : 2016-09-19 DOI: 10.1109/URSI-EMTS.2016.7571317
T. Rimpilainen, H. Wallén, A. Sihvola
{"title":"Porcupic concentrators and bulbic cloaks in planar configuration","authors":"T. Rimpilainen, H. Wallén, A. Sihvola","doi":"10.1109/URSI-EMTS.2016.7571317","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2016.7571317","url":null,"abstract":"This contribution concerns anisotropic elliptic inclusions in a static and uniform excitation field. In particular, the discussion considers anisotropy which is axial in a way that is defined by the elliptic coordinate system. This type of axial anisotropy has been referred to as “radial anisotropy”, although other varieties of radial anisotropy do exist for other geometries. In case of an ellipse, there are at least two methods to create radial anisotropy, and the two methods lead to qualitatively different outcomes. The terms “porcupic” and “bulbic” have been used to refer to these two classes of radial anisotropy. The porcupic inclusions are found to exhibit field concentration and the bulbic ones are found to exhibit cloaking. The contribution discusses both types of inclusions first in isolation and then as layered structures.","PeriodicalId":400853,"journal":{"name":"2016 URSI International Symposium on Electromagnetic Theory (EMTS)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121189064","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
General approach to the synthesis of perfectly refractive metasurfaces 完全折射超表面合成的一般方法
2016 URSI International Symposium on Electromagnetic Theory (EMTS) Pub Date : 2016-09-19 DOI: 10.1109/URSI-EMTS.2016.7571319
V. Asadchy, M. Albooyeh, S. Tcvetkova, Y. Ra'di, S. Tretyakov
{"title":"General approach to the synthesis of perfectly refractive metasurfaces","authors":"V. Asadchy, M. Albooyeh, S. Tcvetkova, Y. Ra'di, S. Tretyakov","doi":"10.1109/URSI-EMTS.2016.7571319","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2016.7571319","url":null,"abstract":"In this presentation we will introduce and discuss a general approach to the synthesis of metasurfaces for full control of reflected and transmitted fields. The method, which is applicable for any linear metasurface, is based on the use of an equivalent Z-matrix, connecting the tangential field components at the two sides on the metasurface. Finding the impedance matrix components, we are able to understand what physical properties of metasurface are needed in order to realize the desired response. Furthermore, we can find the required polarizabilities and/or susceptibilities of the metasurface unit cells and design the cell structures. In particular, we will discuss metasurfaces for perfect refraction into an arbitrary direction, explain possible alternative physical realizations and reveal the crucial role of bianisotropic coupling for design of perfectly matched metasurfaces for transmission control.","PeriodicalId":400853,"journal":{"name":"2016 URSI International Symposium on Electromagnetic Theory (EMTS)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116492188","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
Low-temperature perspective of microgap thermophotovoltaics 微隙热光伏的低温前景
2016 URSI International Symposium on Electromagnetic Theory (EMTS) Pub Date : 2016-09-19 DOI: 10.1109/URSI-EMTS.2016.7571347
C. Simovski, M. Mirmoosa
{"title":"Low-temperature perspective of microgap thermophotovoltaics","authors":"C. Simovski, M. Mirmoosa","doi":"10.1109/URSI-EMTS.2016.7571347","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2016.7571347","url":null,"abstract":"It is commonly thought that the thermophotovoltaic (TPV) electric generators operate only at very high temperatures. This condition implies that their heat sources must be gas burners, furnaces hot flue gases, combustors of the waste, etc. However, we theoretically show that a TPV system with sufficiently narrow cavity between the cold (photovoltaic) and hot (emitting) parts allows a high electric output (inherent to TPV systems) to arise from modest temperatures of the emitter (like those in thermoelectric power generators). This way one will be able to combine the advantages of the TPV system with those of the thermoelectric one. For it one has to introduce a wire metamaterial into a micron cavity. Nanowires are prepared in the cold layer and have free standing ends in the vacuum cavity without a contact to the hot surface.","PeriodicalId":400853,"journal":{"name":"2016 URSI International Symposium on Electromagnetic Theory (EMTS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123557785","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
Physical bounds and automatic design of antennas above ground planes 地平面以上天线的物理边界与自动设计
2016 URSI International Symposium on Electromagnetic Theory (EMTS) Pub Date : 2016-09-19 DOI: 10.1109/URSI-EMTS.2016.7571361
Casimir Ehrenborg, M. Gustafsson
{"title":"Physical bounds and automatic design of antennas above ground planes","authors":"Casimir Ehrenborg, M. Gustafsson","doi":"10.1109/URSI-EMTS.2016.7571361","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2016.7571361","url":null,"abstract":"Physical bounds for antennas above ground planes are calculated by optimizing the antenna current. The bounds are compared with antennas modeled as fragmented patches and optimized using genetic algorithms. Monopole structures over ground planes are modeled with image theory and optimized. The monopole over ground plane structure simplifies experimental verification of the bounds.","PeriodicalId":400853,"journal":{"name":"2016 URSI International Symposium on Electromagnetic Theory (EMTS)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115901331","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
State-space models for stored energy and Q-factors 存储能量和q因子的状态空间模型
2016 URSI International Symposium on Electromagnetic Theory (EMTS) Pub Date : 2016-09-19 DOI: 10.1109/URSI-EMTS.2016.7571359
M. Gustafsson
{"title":"State-space models for stored energy and Q-factors","authors":"M. Gustafsson","doi":"10.1109/URSI-EMTS.2016.7571359","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2016.7571359","url":null,"abstract":"Q-factors are often used to quantify bandwidth performance of resonant structures. The Q-factor is defined as the quotient between the stored and dissipated energies. The time average dissipated energy is reformulated in the dissipated power and is well defined. The definition and evaluation of the stored energy is much more challenging and there are presently several proposals but none is applicable for general radiating system. The main challenge is to separate the radiated and stored parts of the total energy. In this paper, an alternative approach is proposed that is based on a state-space model of the antenna. The state-space model describes the internal states of the system and models the states that stores the energy. The state-space model is determined from the impedance matrix of the electric field integral equation. This provides a computationally efficient way to determine the stored energy that can be used in antenna current optimization. The state-space approach offers also new insight into the challenges to define the stored energy for electrically large objects.","PeriodicalId":400853,"journal":{"name":"2016 URSI International Symposium on Electromagnetic Theory (EMTS)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131619636","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
Disorder-induced light localisation: From random to artificial 无序诱导光定位:从随机到人工
2016 URSI International Symposium on Electromagnetic Theory (EMTS) Pub Date : 2016-09-19 DOI: 10.1109/URSI-EMTS.2016.7571367
Hongwei Yin, Adenowo Gbadebo, E. Turitsyna
{"title":"Disorder-induced light localisation: From random to artificial","authors":"Hongwei Yin, Adenowo Gbadebo, E. Turitsyna","doi":"10.1109/URSI-EMTS.2016.7571367","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2016.7571367","url":null,"abstract":"Light localisation in one-dimensional (1D) randomly disordered medium is usually characterized by randomly distributed resonances with fluctuating transmission values, instead of selectively distributed resonances with close-to-unity transmission values that are needed in real application fields. By a resonance tuning scheme developed recently, opening of favorable resonances or closing of unfavorable resonances are achieved by disorder micro-modification, both on the layered medium and the fibre Bragg grating (FBG) array. And furthermore, it is shown that those disorder-induced resonances are independently tunable. Therefore, selected resonances and arranged light localisation can be achieved via artificial disorder, and thus meet the demand of various application fields.","PeriodicalId":400853,"journal":{"name":"2016 URSI International Symposium on Electromagnetic Theory (EMTS)","volume":"02 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127180943","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
Numerical technique for wireless communication system with high speed movement 高速移动无线通信系统的数值技术
2016 URSI International Symposium on Electromagnetic Theory (EMTS) Pub Date : 2016-09-19 DOI: 10.1109/URSI-EMTS.2016.7571323
S. Sahrani, M. Kuroda
{"title":"Numerical technique for wireless communication system with high speed movement","authors":"S. Sahrani, M. Kuroda","doi":"10.1109/URSI-EMTS.2016.7571323","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2016.7571323","url":null,"abstract":"Numerical technique for the analysis of EM field with high speed moving dielectric body by using FDTD method with Overset Grid Generation method considering Lorentz transformation is presented. The characteristic of EM field when incident wave hits the moving dielectric body with high velocity value are analyzed. The accuracy of the proposed technique is validated. Good agreements are obtained between numerical results and theoretical results. The development of this numerical technique will give a great impact for many areas, particularly for the future high speed mobile communication systems used in transportation and aerial radar systems to detect the high speed motion of a moving boundary.","PeriodicalId":400853,"journal":{"name":"2016 URSI International Symposium on Electromagnetic Theory (EMTS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116763112","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
Gaussian beams for quasi-optical-systems: Modeling dichroic surfaces near a zero of transmission or reflection 准光学系统的高斯光束:接近零透射或反射的二向色面建模
2016 URSI International Symposium on Electromagnetic Theory (EMTS) Pub Date : 2016-08-14 DOI: 10.1109/URSI-EMTS.2016.7571310
A. Chabory, Kevin Elis, J´erˆome Sokoloff, S. Bolioli
{"title":"Gaussian beams for quasi-optical-systems: Modeling dichroic surfaces near a zero of transmission or reflection","authors":"A. Chabory, Kevin Elis, J´erˆome Sokoloff, S. Bolioli","doi":"10.1109/URSI-EMTS.2016.7571310","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2016.7571310","url":null,"abstract":"Gaussian-beam based methods are well-known for modeling quasi-optical systems constituted by mirrors, lenses, and horn antennas. In this article, a solution is proposed to include dichroic surfaces while maintaining the Gaussian-beam formulation. Special attention is devoted to the case where the dichroic surface response presents a zero near the angle of incidence. Numerical experiments are led on a dielectric slab to show the efficiency of the method.","PeriodicalId":400853,"journal":{"name":"2016 URSI International Symposium on Electromagnetic Theory (EMTS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115188019","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
Present and future challenges in preconditioning integral equations for electromagnetics 电磁学积分方程预处理的现状和未来挑战
2016 URSI International Symposium on Electromagnetic Theory (EMTS) Pub Date : 2016-08-14 DOI: 10.1109/URSI-EMTS.2016.7571352
F. Andriulli
{"title":"Present and future challenges in preconditioning integral equations for electromagnetics","authors":"F. Andriulli","doi":"10.1109/URSI-EMTS.2016.7571352","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2016.7571352","url":null,"abstract":"This talk will review the main challenges in preconditioning electromagnetic integral equations and it will delineate some future perspectives for this field. Special attention will be devoted to analyze conditioning problems and challenges in all regimes of interest for applications including the low-frequency, the high frequency, and the elliptic regime. Theoretical considerations will be matched by numerical examples that will corroborate the theory and show the practical impact of advanced preconditioning techniques on real case scenarios.","PeriodicalId":400853,"journal":{"name":"2016 URSI International Symposium on Electromagnetic Theory (EMTS)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124422574","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
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