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

{"title":"A comparative study of RCS computation codes","authors":"Chia Tse Tong, Ang Teng Wah, Lim Kheng Hwee, Ou Sheng Chye Philip, Y. K. Heng, D. Rowse, M. Amos, A. Keen, N. Pegg, A. Thain","doi":"10.1109/WCACEM.2005.1469547","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469547","url":null,"abstract":"This paper reports the results of an ongoing study between BAE Systems, U.K., and DSO National Laboratories, Singapore, into the accuracy, performance and capabilities of computational electromagnetics (CEM) codes. For the purpose of this paper, the authors report two of the selected test cases, a re-sized NASA almond, a generic missile and the COBRA inlet.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"123 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":"114139238","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}

{"title":"Hybrid FDTD analysis for periodic on-chip terahertz (THz) structures","authors":"Y. Hussein, J. Spencer","doi":"10.1109/WCACEM.2005.1469705","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469705","url":null,"abstract":"We present electromagnetic analysis and radiation efficiency calculations for on-chip terahertz (THz) structures based on a hybrid, finite-difference, time-domain (HFDTD) technique. The method employs the FDTD technique to calculate S-parameters for one cell of a periodic structure. The transmission ABCD matrix is then estimated and multiplied by itself n times to obtain the n-cell periodic structure ABCD parameters that are then converted back to S-parameters. Validation of the method is carried out by comparing the results of the hybrid technique with FDTD calculations of the entire periodic structure as well as with HFSS which all agree quite well. This procedure reduces the CPU-time and allows efficient design and optimization of periodic THz radiation sources. Future research will involve coupling of Maxwell's equations with a more detailed, physics-based transport model for higher-order effects.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"76 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120968793","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}

{"title":"Performance of digital transceiver for space-time coded cooperative multihop wireless communication systems","authors":"P. Ngoc, T. Zakoji, H. Murata, K. Araki","doi":"10.1109/WCACEM.2005.1469758","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469758","url":null,"abstract":"This paper describes the performance of a digital transceiver for field trials of multi-hop wireless systems employing space-time coded cooperative relaying. Computer simulations show that cooperative multihop communications give a significant improvement in frame error rate (FER) than non-cooperative multihop systems. Further improvement can be expected by increasing the number of hops and the number of cooperative terminals at each hop. However, this benefit should be evaluated in actual environments, rather than in ideal fading channels assumed in computer simulations. Toward this goal, digital radio transceivers are being built to transmit and receive space-time coded signals. In this paper, the performance of this digital radio transceiver is reported.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"10 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":"116946114","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}

{"title":"Equalization of Numerically Calculated Element Patterns for Root-Based Direction Finding Algorithms","authors":"H. Abdallah, W. Wasylkiwskyj, I. Kopriva","doi":"10.1109/WCACEM.2005.1469538","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469538","url":null,"abstract":"Root-based direction finding algorithms (DF) have several advantages over search-based DF algorithms. A key advantage is the fact that they do not require the array steering vector; this is because these algorithms presume equalized element radiation patterns. In this paper the WIPL-D code is used in designing an array of rectangular probe-fed patch antennas with equalized radiation patterns for measuring the range and bearing of RF emitters in the PCS band (1900-1920 MHz). Direction of arrival (DoA) estimation results based on simulations and measured data are presented and used as a measure of element patterns deviation from equality. Direction finding (DF) algorithms for DoA estimation is a topic that has been studied thoroughly in the past few decades mainly by researchers in the signal processing and antenna theory communities. From signal processing point of view the focus has been on maximizing the number of DoAs that can be accurately estimated and at the same time reducing the computational cost involved in this work. Several algorithms exist and can be used to estimate the DoA of incident signal on an antenna structure (1)-(3). DF algorithms are classified as either search-based or root-based. We refer to the former class as S-DF algorithms and to the later class as R-DF algorithms. R-DF algorithms have several advantages over S-DF algorithms. In addition to their less computation cost where DoAs are calculated by finding the roots of a polynomial of certain order rather than going through intensive search in the whole angular domain, a key advantage from using R-DF algorithms is the fact that they do not require the array steering vector. This is because these algorithms presume equalized element patterns and their accuracy depends on how much the element patterns deviate from equality. This paper investigates the design and performance analysis of antenna structures with equalized element patterns for R-DF algorithms. Adding a number of passive elements around the center active elements and terminating them using a suitable set of loads minimize the deviation of the element patterns of the center elements from equality (4). Return loss and element patterns of two antenna structures comprised of a number of rectangular probe-fed patch antennas are calculated using the WIPL-D code (5). The first structure consists of four elements and no passive elements. In the second structure three passive elements are added on both sides of the four active elements and were terminated in 50Ω. DoA estimation results using the two antenna structures are compared with DoA estimated using measured data. The DoA accuracy is used as a measure of how much element patterns deviate from equality. The paper is organized into four sections. Following this introductory section, in section two return loss and element patterns calculated using WIPL-D are presented for the two antenna structures mentioned before. DoA estimation results using either WIPL calculated","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"18 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":"116728639","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}

{"title":"A coupled-antenna interrogator/receiver for retrodirective crosslinks in a distributed nanosatellite network","authors":"J.D. Roque, S. Sung, B. Murakami, G. S. Shiroma, R. Miyamoto, W. Shiroma","doi":"10.1109/WCACEM.2005.1469662","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469662","url":null,"abstract":"A design for a coupled interrogator/receiver for a retrodirective system is presented. The design consists of two coupled patch antennas for interrogation and receiving, together with the associated electronic hardware. The application is for retrodirective crosslinks in a secure nanosatellite network.","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":"114752094","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}

{"title":"Unilateral amplifier S-parameter extraction technique","authors":"K. Ching, R. Miyamoto, W. Shiroma","doi":"10.1109/WCACEM.2005.1469703","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469703","url":null,"abstract":"A technique for extracting the S-parameters of a unilateral device is presented. The proposed method requires five output power measurements, allowing for real-time evaluation of an active device. An overview of the method, along with simulation and measurement data, is presented here.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"18 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":"124976146","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}

{"title":"The FDFD with the iterative multi-region technique for the scattering from multiple three dimensional objects","authors":"M. Al Sharkawy, V. Demir, A. Elsherbeni","doi":"10.1109/WCACEM.2005.1469690","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469690","url":null,"abstract":"This paper presents a new technique based on an iterative approach using the finite difference frequency domain method to solve large electromagnetic scattering problems. It depends on dividing the computational domain into smaller sub-domains and solving each sub-domain separately. After performing a number of interactions between the sub-domains, the solution for the complete domain can be obtained.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"8 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":"128584639","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}

{"title":"High-frequency scattering by a bent half-plane","authors":"P. Uslenghi","doi":"10.1109/WCACEM.2005.1469652","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469652","url":null,"abstract":"The scattering of a plane electromagnetic wave incident on a metallic structure consisting of a half-plane with a metallic strip of constant width b attached to its edge and oriented perpendicular to the half-plane is considered, in the frequency domain. Rather than introducing a high-frequency technique such as the UTD, we analyze the problem in terms of the closed-form, exact scattering by a half-plane whereby the total field is expressed in terms of Fresnel integrals. This formulation implicitly accounts for the corner-reflector effects, but does not account for the interactions between the edge of the strip and the right-angle corner/wedge. The analysis conducted for the 2D case is extended to the 3D case of a semi-infinite strip of finite width with a right-angle bend, by utilizing a technique due to Siegel. The 3D result thus obtained is compared to the physical optics result.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"45 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":"128348057","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}

{"title":"A card-type inverted LFL antenna for dual-frequency operation","authors":"H. Nakano, K. Morishita, Y. Sato, H. Mimaki, J. Yamauchi","doi":"10.1109/WCACEM.2005.1469738","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469738","url":null,"abstract":"This paper presents a new dual-frequency antenna, called an inverted LFL antenna (InvLFL). The InvLFL is made of a thin conducting film. It has a flat structure (card-type structure), where both the radiation elements and the ground plate lie in the same plane. The card-type structure facilitates the use of the InvLFL in PC card devices for personal computers or for use inside mobile phone handsets. Responding to a demand for dual-frequency operation at 2.45 GHz and 5.2 GHz (frequencies used for wireless LAN communications), this paper describes the design process and reveals the radiation characteristics obtained using the finite-difference time-domain method (FDTDM).","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":"130426441","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}

{"title":"Broadband over power lines (BPL) interference analysis","authors":"Riva Road Annapolis","doi":"10.1109/WCACEM.2005.1469770","DOIUrl":"https://doi.org/10.1109/WCACEM.2005.1469770","url":null,"abstract":"Numerical Electromagnetics Code, Version 4.1 (NEC4) was used to predict near field horizontally polarized field strength and far field radiation patterns of signals radiating in the HF band (2-30 MHz) from a 2000 foot span of (13 kV or less) medium voltage (MV) electrical transmission line typical of those used to transport broadband over power lines (BPL) signals. Interference potential to high antenna gain, low noise floor, HF ground side receive sites was analyzed to support a petition to the FCC to restrict BPL emissions on the aeronautical mobile (R) frequencies.","PeriodicalId":368249,"journal":{"name":"IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005.","volume":"79 4 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":"124771752","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}