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2010 URSI International Symposium on Electromagnetic Theory最新文献

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Highly accurate Finite Difference analysis of leaky, guided and complex waves in photonic optical fibres and dielectric waveguidning structures 光子光纤和介电波导结构中漏波、导波和复波的高精度有限差分分析
2010 URSI International Symposium on Electromagnetic Theory Pub Date : 2010-11-15 DOI: 10.1109/URSI-EMTS.2010.5637225
P. Kowalczyk, M. Mrozowski
{"title":"Highly accurate Finite Difference analysis of leaky, guided and complex waves in photonic optical fibres and dielectric waveguidning structures","authors":"P. Kowalczyk, M. Mrozowski","doi":"10.1109/URSI-EMTS.2010.5637225","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637225","url":null,"abstract":"In this paper an accurate boundary condition is applied for analysis of open waveguiding structures properties. All types of modes are considered: guided, leaky and complex modes. The scheme is based on analytical solution obtained for homogeneous structure. The accuracy of the results is much better than in standard algorithm involving PML technique. The numerical tests show that the improvement is especially noticeable for imaginary part of the propagation coefficient which represents the radiation effects.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"39 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":"128136447","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
Fast Fourier Transform preprocessing for accelerated plane wave based spherical near-field far-field transformation 基于加速平面波球面近场远场变换的快速傅里叶变换预处理
2010 URSI International Symposium on Electromagnetic Theory Pub Date : 2010-11-15 DOI: 10.1109/URSI-EMTS.2010.5637234
C. Schmidt, T. Laitinen, T. Eibert
{"title":"Fast Fourier Transform preprocessing for accelerated plane wave based spherical near-field far-field transformation","authors":"C. Schmidt, T. Laitinen, T. Eibert","doi":"10.1109/URSI-EMTS.2010.5637234","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637234","url":null,"abstract":"Near-field measurement and transformation techniques are widely applied to characterize the radiation pattern of antennas. Spherical near-field measurements have been researched widely and various techniques with different probe compensation capabilities and complexities exist. Among those techniques applicable for (almost) arbitrary probes and based on spherical wave translations, the crucial computational relaxations have been gained through the use of a Fourier Transform based preprocessing of the measurement data. It is shown in this paper that the same Fourier Transform based preprocessing step can be applied in conjunction with the plane wave based probe-corrected near-field far-field transformations. The collection of probe signals is split into smaller sub sets by an Inverse Fast Fourier Transform. These sub problems can be solved with a reduced overall complexity and also a full probe correction is achieved.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"123 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":"133267886","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: 6
Combined use of PO-MoM and Local-MoM for reducing MoM areas for wide angular observation points 结合PO-MoM和Local-MoM减少广角观测点MoM面积
2010 URSI International Symposium on Electromagnetic Theory Pub Date : 2010-11-15 DOI: 10.1109/URSI-EMTS.2010.5637313
K. Ito, M. Ando, T. Shijo
{"title":"Combined use of PO-MoM and Local-MoM for reducing MoM areas for wide angular observation points","authors":"K. Ito, M. Ando, T. Shijo","doi":"10.1109/URSI-EMTS.2010.5637313","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637313","url":null,"abstract":"PO-MoM is a hybrid method where Physical Optics Current Approximation is corrected by addition of the Fringe wave component (FW) obtained by Method of Moment (MoM). Authors have succeeded to define/localize the areas for the MoM on the scatterer by introducing the Fresnel zone number. Unfortunately, this area extends most of the scatterer surface for some specific combinations of the source and the observer and reduction of computational load fails. This paper introduces another high frequency concept of locality of diffraction, Local-MoM, proposed by the authors, for compensating this defect. Combined use of PO-MoM and Local-MoM realizes almost frequency independent number of unknowns.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"55 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":"133031756","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: 4
On the use of high-frequency asymptotic concepts for the development of efficient adaptive numerical integration algorithms 利用高频渐近概念开发高效的自适应数值积分算法
2010 URSI International Symposium on Electromagnetic Theory Pub Date : 2010-11-15 DOI: 10.1109/URSI-EMTS.2010.5637311
G. Carluccio, M. Albani
{"title":"On the use of high-frequency asymptotic concepts for the development of efficient adaptive numerical integration algorithms","authors":"G. Carluccio, M. Albani","doi":"10.1109/URSI-EMTS.2010.5637311","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637311","url":null,"abstract":"The possibility of reducing the sampling point density in the numerical evaluation of radiation integrals is discussed by resorting to asymptotic high-frequency technique concepts. It is shown that the numerical evaluation of the radiation integrals becomes computationally more efficient by introducing an adaptive sampling. By this approach the number of sampling points results drastically smaller than the standard Nyquist sampling rate.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"48 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":"125615604","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
MIMO performance of closely spaced antennas in the 700 MHz band 700mhz频段紧密间隔天线的MIMO性能
2010 URSI International Symposium on Electromagnetic Theory Pub Date : 2010-11-15 DOI: 10.1109/URSI-EMTS.2010.5637083
A. Derneryd, J. Fridén, A. Stjernman
{"title":"MIMO performance of closely spaced antennas in the 700 MHz band","authors":"A. Derneryd, J. Fridén, A. Stjernman","doi":"10.1109/URSI-EMTS.2010.5637083","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637083","url":null,"abstract":"Performance of two 0.3 wavelengths separated antennas in the 700 MHz band are evaluated and improved by connecting a matching and decoupling network to the antenna ports. It is shown through simulations that the network improves efficiency, diversity gain, MIMO Shannon capacity, and reduces the correlation coefficient. The concept is implemented and validated in two dual-antenna mock-ups with slightly different ground plane sizes.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"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":"123129917","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: 3
Sub-wavelength near field imaging using a cross polarised slot with wire insert 亚波长近场成像使用交叉极化槽与电线插入
2010 URSI International Symposium on Electromagnetic Theory Pub Date : 2010-11-15 DOI: 10.1109/URSI-EMTS.2010.5637171
T. Pochiraju, O. Malyuskin, V. Fusco
{"title":"Sub-wavelength near field imaging using a cross polarised slot with wire insert","authors":"T. Pochiraju, O. Malyuskin, V. Fusco","doi":"10.1109/URSI-EMTS.2010.5637171","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637171","url":null,"abstract":"In this paper we study sub-wavelength imaging by a new type of probe comprising a single cross polarized slot cut into a metal plate which has a wire inserted along its length. Using this arrangement we show by numerical simulation and experimentally that the transmitted near field can be enhanced up to 25dB with respect to the unloaded slot transmission. Moreover, superior near field squeezing results in 0.14 λ FWHM at 0.1λ distance from the slot. The arrangement yields image resolution capability of better than λ/4 at distance between 0.1λ and 0.2λ from the slot.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"37 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":"124988984","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: 3
Preconditioning iterative MLFMA solutions of integral equations 积分方程的预处理迭代MLFMA解
2010 URSI International Symposium on Electromagnetic Theory Pub Date : 2010-11-15 DOI: 10.1109/URSI-EMTS.2010.5637219
L. Gurel, T. Malas, O. Ergul
{"title":"Preconditioning iterative MLFMA solutions of integral equations","authors":"L. Gurel, T. Malas, O. Ergul","doi":"10.1109/URSI-EMTS.2010.5637219","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637219","url":null,"abstract":"The multilevel fast multipole algorithm (MLFMA) is a powerful method that enables iterative solutions of electromagnetics problems with low complexity. Iterative solvers, however, are not robust for three-dimensional complex real-life problems unless suitable preconditioners are used. In this paper, we present our efforts to devise effective preconditioners for MLFMA solutions of difficult electromagnetics problems involving both conductors and dielectrics.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"15 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":"125495135","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: 3
Correlation between peak spatial-average SAR and maximum temperature elevation in layered cubical model in the frequency range above 3 GHz 层状立方体模式在3ghz以上频率范围内SAR峰值与最高温度升高的相关性
2010 URSI International Symposium on Electromagnetic Theory Pub Date : 2010-11-15 DOI: 10.1109/URSI-EMTS.2010.5637174
A. Hirata, K. Sugiura, Y. Kanai, O. Fujiwara
{"title":"Correlation between peak spatial-average SAR and maximum temperature elevation in layered cubical model in the frequency range above 3 GHz","authors":"A. Hirata, K. Sugiura, Y. Kanai, O. Fujiwara","doi":"10.1109/URSI-EMTS.2010.5637174","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637174","url":null,"abstract":"The present study investigates the correlation between maximum temperature elevation and peak mass-averaged specific absorption rates (SARs) in layered one-dimensional model and layered cubical model. The resolution of the model is 0.5 mm or less in order to calculate the correlation in frequencies up to 10 GHz. Our computational investigation in the one-dimensional model showed that the variability due to the thickness is several dozen percents or more, which is dependent on the frequency. In the three-dimensional homogeneous model, SARs averaged over 10 g provides reasonable correlation with maximum temperature elevation for frequencies up to 6 GHz. For the layered cubical model, the SAR averaged over 1g provides better frequency characteristics of the correlation with the maximum temperature elevation, while the variability of the ratio for different tissue thickness remains future work.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"134 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":"134084676","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
“Virtual Drive” physical layer simulations for Vehicle-to-Vehicle communication 用于车对车通信的“虚拟驱动器”物理层模拟
2010 URSI International Symposium on Electromagnetic Theory Pub Date : 2010-11-15 DOI: 10.1109/URSI-EMTS.2010.5637337
L. Reichardt, T. Schipper, T. Zwick
{"title":"“Virtual Drive” physical layer simulations for Vehicle-to-Vehicle communication","authors":"L. Reichardt, T. Schipper, T. Zwick","doi":"10.1109/URSI-EMTS.2010.5637337","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637337","url":null,"abstract":"Future mobile communications, in the mean of Car-to-Car (C2C), Car-to-Infrastructure (C2I) or Vehicle-to-Vehicle (V2V) communication, will make use of multiple antenna systems like diversity or MIMO. Especially in multiple antenna systems finding the optimal antenna configuration in order to ensure the best performance is a very difficult task. Presently antennas in mobile communications systems, especially in cars, are selected in a rather expensive and time consuming test-drives, if at all. This will not be technically possible and affordable for multiple antenna systems in the future. Here a solution for this problem is demonstrated defined as Virtual Drive. In the Virtual Drive the quality of the antenna system is determined by simulating the mobile, driving through the EM-fields radiated from the transmitter. The multi-path propagation from the transmitter is calculated by a 3D ray-tracing tool, which is based on the theory of geometrical optics (GO) and the Uniform Theory of Diffraction (UTD). The combination of both yields a “virtual drive” through any scenario and allows optimization of antenna configurations without extensive measurement campaigns and without prototyping all configurations to be investigated. Additionally Virtual Drive provides a perfect repeatability of the testing environment.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"202 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":"133794341","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: 6
Optimized design of a compact low-cost 4 element microstrip antenna array for WLAN 一种用于WLAN的紧凑低成本4元微带天线阵列的优化设计
2010 URSI International Symposium on Electromagnetic Theory Pub Date : 2010-11-15 DOI: 10.1109/URSI-EMTS.2010.5637167
Zhongkun Ma, V. Volski, G. Vandenbosch
{"title":"Optimized design of a compact low-cost 4 element microstrip antenna array for WLAN","authors":"Zhongkun Ma, V. Volski, G. Vandenbosch","doi":"10.1109/URSI-EMTS.2010.5637167","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637167","url":null,"abstract":"An innovative 4 element array topology of microstrip E shaped patches for use in WLAN applications is revisited and optimized by a novel Particle Swarm Optimization (PSO) implementation. This optimiser is capable to operate with a reduced number of cost function evaluations, since all evaluated antenna configurations and corresponding cost function values are saved. During the PSO optimization process, the fitness of the particle is evaluated by a full wave solver based on the moment of method. The used cost functions are constructed using s-parameters and the array gain in order to achieve the optimal performance. The operating frequency range is from 3.4 to 3.8 GHz and the gain of the array is more than 13 dB. The main beam direction is normal to the ground plane. Finally CST EM Studio is used to validate the global best antenna candidate structure.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"192 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":"116521754","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
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