Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637179
S. Kuroda, T. Oshima, S. Urasaki
The proposal for an observation system of crustal movement using two quasi-zenith satellites is presented. In the system, two quasi-zenith satellites have a retro-directive antenna on board and an earth station have two beam antenna in the direction to the two quasi-zenith satellites. The crustal movement at the area of the earth stations is obtained by interfering with two signals from the retro-directive antennas which transmit the receiving waves from the earth station antenna. The link budget for the system is carried out, and a spherical reflector antenna for two beam antenna is designed.
{"title":"A crustal movement observation system using quasi-zenith satellites","authors":"S. Kuroda, T. Oshima, S. Urasaki","doi":"10.1109/URSI-EMTS.2010.5637179","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637179","url":null,"abstract":"The proposal for an observation system of crustal movement using two quasi-zenith satellites is presented. In the system, two quasi-zenith satellites have a retro-directive antenna on board and an earth station have two beam antenna in the direction to the two quasi-zenith satellites. The crustal movement at the area of the earth stations is obtained by interfering with two signals from the retro-directive antennas which transmit the receiving waves from the earth station antenna. The link budget for the system is carried out, and a spherical reflector antenna for two beam antenna is designed.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114216560","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}
Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637020
Yoshihiro Ito
A high-speed camera with electric field based shuttering can be capable of framing with precision of nanosecond or picosecond range. The shutter mechanism is controlled by an electric pulse on a photo-cathode, through which the incoming X-ray light is converted to an electron density distribution via photoelectric effect. The purpose of this study is to compensate for the simultaneity of the pulse-gated image by spatially controlling the transit time of photoelectrons. Control of the transit time is achieved by slightly inclining the photocathode. However, the configuration of the Micro Channel Plate (MCP) is different from that of conventional MCP gated cameras. Therefore, it is necessary to perform a time-domain analysis of the amplification characteristics of the MCP when the gating pulse is applied to the electrodes on the MCP.
{"title":"Numerical evaluation of an ultra high-speed X-ray camera with respect to gated image simultaneity","authors":"Yoshihiro Ito","doi":"10.1109/URSI-EMTS.2010.5637020","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637020","url":null,"abstract":"A high-speed camera with electric field based shuttering can be capable of framing with precision of nanosecond or picosecond range. The shutter mechanism is controlled by an electric pulse on a photo-cathode, through which the incoming X-ray light is converted to an electron density distribution via photoelectric effect. The purpose of this study is to compensate for the simultaneity of the pulse-gated image by spatially controlling the transit time of photoelectrons. Control of the transit time is achieved by slightly inclining the photocathode. However, the configuration of the Micro Channel Plate (MCP) is different from that of conventional MCP gated cameras. Therefore, it is necessary to perform a time-domain analysis of the amplification characteristics of the MCP when the gating pulse is applied to the electrodes on the MCP.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115936655","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}
Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637125
Su Yan, Jianming Jin, Z. Nie
Some recent advances in the Calderón preconditioning techniques for integral-equation-based methods are discussed in this paper. Four different techniques are presented briefly: a low-frequency Calderón preconditioner for the electric-field integral equation (EFIE) in analyzing perfect electric conductor (PEC) problems, an augmented EFIE (AEFIE) with Calderón preconditioner for simulating electrically large problems, several Calderón-type preconditioners for the Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) equations, and the derivation of N-Müller equations using Calderón identities. A number of numerical examples are given to demonstrate the performance of the proposed approaches.
本文讨论了基于积分方程方法的Calderón预处理技术的最新进展。简要介绍了四种不同的技术:用于分析完美电导体(PEC)问题的电场积分方程(EFIE)的低频Calderón预调节器，用于模拟电大问题的带有Calderón预调节器的增广EFIE (AEFIE)，用于Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT)方程的几种Calderón-type预调节器，以及使用Calderón等式推导n- m ller方程。通过数值算例验证了所提方法的有效性。
{"title":"Calderón preconditioning techniques for integral equation based methods","authors":"Su Yan, Jianming Jin, Z. Nie","doi":"10.1109/URSI-EMTS.2010.5637125","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637125","url":null,"abstract":"Some recent advances in the Calderón preconditioning techniques for integral-equation-based methods are discussed in this paper. Four different techniques are presented briefly: a low-frequency Calderón preconditioner for the electric-field integral equation (EFIE) in analyzing perfect electric conductor (PEC) problems, an augmented EFIE (AEFIE) with Calderón preconditioner for simulating electrically large problems, several Calderón-type preconditioners for the Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) equations, and the derivation of N-Müller equations using Calderón identities. A number of numerical examples are given to demonstrate the performance of the proposed approaches.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121487825","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}
Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637014
A. Buffi, P. Nepa, G. Manara
A detailed analysis of the performance of near-field focused planar arrays is addressed. Performance data are shown for planar square arrays, as a function of antenna size, interelement distance and focal distance.
{"title":"Performance analysis of near-field focused planar arrays","authors":"A. Buffi, P. Nepa, G. Manara","doi":"10.1109/URSI-EMTS.2010.5637014","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637014","url":null,"abstract":"A detailed analysis of the performance of near-field focused planar arrays is addressed. Performance data are shown for planar square arrays, as a function of antenna size, interelement distance and focal distance.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121566335","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}
Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637299
C. Sohl, M. Gustafsson
The two-dimensional scattering problem of a perfectly conducting cylinder S of arbitrary cross section is examined using the T-matrix method. Both the TM-polarization and the TE-polarization are considered by imposing homogeneous Dirichlet and Neumann boundary conditions on S, respectively. Explicit expressions for the circular cylinder are derived and compared to classical Mie series expansion.
{"title":"The T-matrix method for solving two-dimensional scattering problems","authors":"C. Sohl, M. Gustafsson","doi":"10.1109/URSI-EMTS.2010.5637299","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637299","url":null,"abstract":"The two-dimensional scattering problem of a perfectly conducting cylinder S of arbitrary cross section is examined using the T-matrix method. Both the TM-polarization and the TE-polarization are considered by imposing homogeneous Dirichlet and Neumann boundary conditions on S, respectively. Explicit expressions for the circular cylinder are derived and compared to classical Mie series expansion.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125287235","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}
Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637377
A. Alú
We discuss the fundamental leaky-wave properties of linear arrays of plasmonic nanoparticles, in order to realize sub-diffraction optical leaky-wave nanoantennas, with particular attention to the mathematical and analytical aspects of the associated boundary value problem. We focus on the longitudinal polarization regime, which may provide efficient and directive radiation, despite the inherent presence of material absorption in plasmonic materials. Using closed-form dispersion relations derived in the complex domain, we discuss the dispersion properties of leaky and complex modes, and we highlight under which conditions a sub-diffractive nanoparticle array may support directive conical radiation with frequency scanning properties. This may be of great interest for a variety of potential applications in optical communications and radiation.
{"title":"Optical leaky-wave nanoantenna: Complex modes along linear arrays of plasmonic nanoparticles","authors":"A. Alú","doi":"10.1109/URSI-EMTS.2010.5637377","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637377","url":null,"abstract":"We discuss the fundamental leaky-wave properties of linear arrays of plasmonic nanoparticles, in order to realize sub-diffraction optical leaky-wave nanoantennas, with particular attention to the mathematical and analytical aspects of the associated boundary value problem. We focus on the longitudinal polarization regime, which may provide efficient and directive radiation, despite the inherent presence of material absorption in plasmonic materials. Using closed-form dispersion relations derived in the complex domain, we discuss the dispersion properties of leaky and complex modes, and we highlight under which conditions a sub-diffractive nanoparticle array may support directive conical radiation with frequency scanning properties. This may be of great interest for a variety of potential applications in optical communications and radiation.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123863969","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}
Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637188
Masahiro Tanaka, Kazuo Tanaka
We discuss 2-dimensional optical circuits composed of photonic crystal structure and slab waveguides. We show some numerical results to reduce the scattered energy. The number of dielectric rods of photonic crystal waveguide is changed, in order to find the minimum number of dielectric rods for photonic bandgap structure.
{"title":"Computer simulations of 2-dimensional slab waveguides with photonic crystal structure by method of moments","authors":"Masahiro Tanaka, Kazuo Tanaka","doi":"10.1109/URSI-EMTS.2010.5637188","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637188","url":null,"abstract":"We discuss 2-dimensional optical circuits composed of photonic crystal structure and slab waveguides. We show some numerical results to reduce the scattered energy. The number of dielectric rods of photonic crystal waveguide is changed, in order to find the minimum number of dielectric rods for photonic bandgap structure.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122844509","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}
Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637158
H. Schippers, Tomas Lundin, J. Heijstek
This paper addresses the modelling of radar absorbing composite layers with ferromagnetic inclusions. The radar absorbing properties of these layers are strongly determined by the effective permeability of the composite material. The applicability of mixing formulas is discussed to determine the effective permeability. Furthermore, the RF-frequency behaviour of ferromagnetic inclusions is described. The mixing formulas and the RF-frequency behaviour of ferromagnetic inclusions are used in tools to support the EM design of radar absorbing composite layers.
{"title":"Modelling of magnetic radar absorbing composites","authors":"H. Schippers, Tomas Lundin, J. Heijstek","doi":"10.1109/URSI-EMTS.2010.5637158","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637158","url":null,"abstract":"This paper addresses the modelling of radar absorbing composite layers with ferromagnetic inclusions. The radar absorbing properties of these layers are strongly determined by the effective permeability of the composite material. The applicability of mixing formulas is discussed to determine the effective permeability. Furthermore, the RF-frequency behaviour of ferromagnetic inclusions is described. The mixing formulas and the RF-frequency behaviour of ferromagnetic inclusions are used in tools to support the EM design of radar absorbing composite layers.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"52 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122871782","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}
Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637332
Olivier Renaudin, V. Kolmonen, P. Vainikainen, Claude Oestges
In this paper, we focus on the stationarity of the scatterer contributions in highly time-variant wideband Car-to-Car (C2C) channels. To do so, these scatterer contributions were first extracted using a high-resolution algorithm and the corresponding time-variant stationarity intervals were estimated using the Correlation Matrix Distance (CMD).
{"title":"About the multipath stationarity of Car-to-Car channels in the 5 GHz band","authors":"Olivier Renaudin, V. Kolmonen, P. Vainikainen, Claude Oestges","doi":"10.1109/URSI-EMTS.2010.5637332","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637332","url":null,"abstract":"In this paper, we focus on the stationarity of the scatterer contributions in highly time-variant wideband Car-to-Car (C2C) channels. To do so, these scatterer contributions were first extracted using a high-resolution algorithm and the corresponding time-variant stationarity intervals were estimated using the Correlation Matrix Distance (CMD).","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115149088","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}
Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637192
Yury Podlipenko, Y. Shestopalov, Vladimir Prishlyak
The creation and justification of the methods for minimax estimation of parameters of the external boundary value problems for the Helmholtz equation in unbounded domains are considered. When observations are distributed in subdomains, the determination of minimax estimates is reduced to the solution of integro-differential equations in bounded domains. When observations are distributed on a system of surfaces the problem is reduced to solving integral equations on an unclosed bounded surface which is a union of the boundary of the domain and this system of surfaces. Minimax estimation of the solutions to the boundary value problems from point observations is also studied.
{"title":"Estimation of solutions of Helmholtz problems with uncertain data","authors":"Yury Podlipenko, Y. Shestopalov, Vladimir Prishlyak","doi":"10.1109/URSI-EMTS.2010.5637192","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637192","url":null,"abstract":"The creation and justification of the methods for minimax estimation of parameters of the external boundary value problems for the Helmholtz equation in unbounded domains are considered. When observations are distributed in subdomains, the determination of minimax estimates is reduced to the solution of integro-differential equations in bounded domains. When observations are distributed on a system of surfaces the problem is reduced to solving integral equations on an unclosed bounded surface which is a union of the boundary of the domain and this system of surfaces. Minimax estimation of the solutions to the boundary value problems from point observations is also studied.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127637814","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}
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