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IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.最新文献

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Prediction of VHF radiation patterns on Gulfstream aircraft 湾流飞机VHF辐射模式预测
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469639
C. Penwell
{"title":"Prediction of VHF radiation patterns on Gulfstream aircraft","authors":"C. Penwell","doi":"10.1109/WCACEM.2005.1469639","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469639","url":null,"abstract":"The simulated results have provided great insight into the behavior of radiation patterns as the antenna is moved around the aircraft. The information gained through these simulations provides greater confidence when new locations must be found for the VHF antennas. More work needs to be done to further refine the 3D model that is used, taking into account fairings, composite materials and windows. Further work on co-site interactions between multiple VHF systems continues. Similar analysis is expanded to higher frequencies, such as UHF and L-band, encompassing all navigation, communication and special mission antennas. Successfully integrating 50 to 70 antennas on a small structure is extremely challenging. EM analysis helps ensure that maximum performance can be obtained across all the systems.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126823639","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 generalized MATLAB-based distributed-computing optimization tool 一个通用的基于matlab的分布式计算优化工具
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469554
K. Lysiak, J. Polendo
{"title":"A generalized MATLAB-based distributed-computing optimization tool","authors":"K. Lysiak, J. Polendo","doi":"10.1109/WCACEM.2005.1469554","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469554","url":null,"abstract":"A distributed computing optimization architecture was developed by SwRI for use with numerical solvers. This optimization toolbox is very generalized and can be easily adapted to use with any numerical solver having a well-described input and output file system. In combination with the use of MATLAB, this makes it a very flexible and powerful analysis and development tool. The tool employs an optimization routine, input file modification routines to generate numerous solver input files, and output extraction routines to extract the pertinent solver output data. Specifically, advanced development has been done using the numerical electromagnetic code (NEC) ante wire/plate with dielectrics (WIPL-D), genetic algorithm optimization toolbox (GAOT) and CONDOR/sup /spl reg// to demonstrate proof-of-concept.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114233236","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
A new approach to electromagnetic wave diffraction by a plane with an impedance discontinuity 阻抗不连续平面的电磁波衍射新方法
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469735
B. Jiang, Yong-tan Liu
{"title":"A new approach to electromagnetic wave diffraction by a plane with an impedance discontinuity","authors":"B. Jiang, Yong-tan Liu","doi":"10.1109/WCACEM.2005.1469735","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469735","url":null,"abstract":"In this paper, an analytical method is used to formulate the problem of plane wave diffraction by a plane with an impedance discontinuity. This approach is essentially based on two main ingredients: the decomposition of electromagnetic fields, which express the field vector as (E/sub u/, H/sub u/) and (E/sub l/, H/sub l/), and the introduction of equivalent electric (magnetic) currents adopted for convenience. The fields (E/sub u/, H/sub u/) are expressed in terms of the form for a plane wave diffracted by a continuous constant-impedance plane, and the (E/sub u/, H/sub u/) given by the equivalent source, can be cast into an integral of the Hankel function with the special variables. The present method, in principle, can be extended to obtain the corresponding results for the arbitrary incident waves (e.g. the fields of dipole excitation).","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122218553","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
An efficient timing synchronization method for OFDMA system OFDMA系统中一种有效的定时同步方法
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469756
Jung-Ju Kim, Jung-Ho Noh, K. Chang
{"title":"An efficient timing synchronization method for OFDMA system","authors":"Jung-Ju Kim, Jung-Ho Noh, K. Chang","doi":"10.1109/WCACEM.2005.1469756","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469756","url":null,"abstract":"In this paper, an efficient timing synchronization method for OFDMA (OFDM-FDMA) systems is presented. Under the multipath channel environment of ITU-R M.1225, detection probability, false alarm and missing probability of the proposed timing synchronization scheme are compared with the existing method of 2004 to demonstrate the excellence of the proposed scheme. Additional results will be added for the case of higher mobility.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123145514","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: 5
Time and frequency evolution of precursor fields in dispersive media using FDTD and joint time-frequency analysis 基于时域有限差分和时频联合分析的色散介质中前驱体场时频演化
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469726
R. Safian, C. Sarris, M. Mojahedi
{"title":"Time and frequency evolution of precursor fields in dispersive media using FDTD and joint time-frequency analysis","authors":"R. Safian, C. Sarris, M. Mojahedi","doi":"10.1109/WCACEM.2005.1469726","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469726","url":null,"abstract":"In this paper, the finite difference time domain (FDTD) technique is combined with time-frequency analysis, to provide a versatile approach for the modeling of precursor fields in dispersive media. Previous analytical studies, based on asymptotic analysis, are restricted to simple media, while the proposed approach can address spatially complex and spatially dispersive media, including artificial dielectrics. In addition, the time-frequency analysis provides an insightful description of broadband pulse propagation in dispersive media, including the temporal evolution of pulse harmonics.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129142797","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
Compensation of channel information error using first order extrapolation in eigenbeam space division multiplexing (E-SDM) 基于一阶外推的本征波束空分复用信道误差补偿
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469525
T. Nishimura, T. Tsutsumi, T. Ohgane, Ogawa Y
{"title":"Compensation of channel information error using first order extrapolation in eigenbeam space division multiplexing (E-SDM)","authors":"T. Nishimura, T. Tsutsumi, T. Ohgane, Ogawa Y","doi":"10.1109/WCACEM.2005.1469525","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469525","url":null,"abstract":"In multiple-input multiple-output (MIMO) systems, eigenbeam space division multiplexing (E-SDM) has a higher performance compared to conventional SDM and has an advantage that simple detection algorithms are available at a receiver. However, the transmitter requires MIMO channel information. If it has an error, the performance degradation is inevitable. In this paper, we propose a compensation way against channel information error due to temporal channel transition. The effect is also numerically analyzed.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131391127","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: 7
Coupled retractable whip/stub antennas for mobile phones 用于移动电话的耦合可伸缩鞭子/短根天线
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469741
F. Tefiku, K. Li
{"title":"Coupled retractable whip/stub antennas for mobile phones","authors":"F. Tefiku, K. Li","doi":"10.1109/WCACEM.2005.1469741","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469741","url":null,"abstract":"In this paper, a whip/stub antenna design is presented that utilizes an additional matching circuit to manipulate the coupling between the whip and stub in order to provide higher design flexibility. The flexibility of this antenna makes it suitable for use in mobile phones with variable form configurations, such as fold or slide phones. A methodology on how to select the whip length and the radiator structure of the stub antenna is described.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122967450","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
Ultra-wideband miniaturized electromagnetic bandgap structures embedded in printed circuit boards: theory, modeling and experimental validation 印刷电路板中嵌入的超宽带小型化电磁带隙结构:理论、建模和实验验证
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469704
S. Shahparnia, O. Ramahi
{"title":"Ultra-wideband miniaturized electromagnetic bandgap structures embedded in printed circuit boards: theory, modeling and experimental validation","authors":"S. Shahparnia, O. Ramahi","doi":"10.1109/WCACEM.2005.1469704","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469704","url":null,"abstract":"This work presents a novel design for electromagnetic bandgap (EBG) structures embedded in printed circuit boards (PCB). The presented design is able to mitigate switching noise in a power distribution network (PDN) on an unprecedented range of frequencies, while having a very compact, miniaturized and practical structure. The theory of operation of this design is presented using a new equivalent circuit model for embedded EBG (EEBG) structures. The model based on the transmission line theory and cascaded structures, by employing a simple lumped-element substitute for the patch-via structure, presents a first order, but detailed, quantitative analysis of the filtering properties of the metallo-dielectric EBG structure. Laboratory PCB prototypes were fabricated and tested revealing appreciable suppression of noise testifying to the effectiveness of our design.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128439565","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
Performance of space-time trellis codes over Nakagami fading channels 时空网格码在中上衰落信道上的性能
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469670
M. O. Farooq, Wei Li, T. Gulliver
{"title":"Performance of space-time trellis codes over Nakagami fading channels","authors":"M. O. Farooq, Wei Li, T. Gulliver","doi":"10.1109/WCACEM.2005.1469670","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469670","url":null,"abstract":"Space-time trellis codes provide both diversity gain and coding gain. There are two different design criteria proposed for space-time trellis codes (STTCs), namely the rank and determinant criteria (RDC) and the Euclidean distance design criteria (EDC). In this paper, we present the performance of STTCs over Nakagami fading channels. Our results show that the STTCs designed for Rayleigh fading channels are also suitable for Nakagami fading channels.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128441260","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
Electrically large structures in WIPL-D WIPL-D中的电大结构
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005. Pub Date : 2005-04-03 DOI: 10.1109/WCACEM.2005.1469534
Meng Yuan, T. Sarkar
{"title":"Electrically large structures in WIPL-D","authors":"Meng Yuan, T. Sarkar","doi":"10.1109/WCACEM.2005.1469534","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469534","url":null,"abstract":"In this paper, an electrically large structure, a 50-/spl lambda/ (where /spl lambda/ is the wave length) long airplane and a dual-polarized 60-element Vivaldi array are run in 64-bit version WIPL-D/sup /spl reg// software on the Intel/sup /spl reg// Itanium2/sup /spl reg// platform with 64GB physical memory. The scattering electromagnetic parameters (the RCS, the surface current, and the near field) and the radiation pattern are shown. The memory usage and the CPU times for different number of unknowns larger than the limit of 32-bit PCs are listed. We also show that this 64-bit version of WIPL-D can go beyond the 64GB physical memory and the speed is not significantly decreased when the virtual memory is used.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117295075","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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