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2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting最新文献

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Fast shielding effectiveness evaluation of a thin wall rectangular enclosure with numerous small circular apertures 具有许多小圆孔的薄壁矩形外壳的快速屏蔽效能评估
2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting Pub Date : 2009-03-24 DOI: 10.1109/ANTEMURSI.2009.4805061
P. Dehkhoda, A. Tavakoli, R. Moini
{"title":"Fast shielding effectiveness evaluation of a thin wall rectangular enclosure with numerous small circular apertures","authors":"P. Dehkhoda, A. Tavakoli, R. Moini","doi":"10.1109/ANTEMURSI.2009.4805061","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805061","url":null,"abstract":"In this paper, an extremely fast technique is introduced to evaluate the shielding effectiveness os a thin-wall rectangular enclosure with numerous circular small apertures. The technique is based on the traditional waveguide circuit model where the ecnlosure is replaced with an equivalent shorted transmission line. In the proposed circuit model, the perforated thin wall is replaced by a proper equivalent impedenace that is derived from the reflection coefficient. The computation results are in very good agreement with measurements. Besides accuracy, the method is extremely efficient and easy to implement compared to the numerical techniques.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129108578","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
Contrast-enhanced microwave breast imaging 对比增强微波乳房成像
2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting Pub Date : 2009-03-24 DOI: 10.1109/ANTEMURSI.2009.4805113
J. D. Shea, P. Kosmas, S. Hagness, B. V. Van Veen
{"title":"Contrast-enhanced microwave breast imaging","authors":"J. D. Shea, P. Kosmas, S. Hagness, B. V. Van Veen","doi":"10.1109/ANTEMURSI.2009.4805113","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805113","url":null,"abstract":"Tomographic maps of the dielectric distribution of breast tissue can be made at microwave frequencies by applying nonlinear optimization techniques to the electromagnetic inverse scattering problem. There is a mismatch between the resolution of UHF band microwaves and the feature size of fibroconnective and glandular breast tissues which fundamentally limits the ability of such imaging systems to clearly resolve these structures. Tumor detection is further challenged by the small intrinsic contrast between the dielectric properties of normal and malignant glandular tissues. The use of contrast agents to preferentially alter the properties of malignant tissues is a potential approach to improving detection performance. In this paper, we explore the information available to contrast-enhanced imaging of realistic numerical breast phantoms at microwave frequencies. Differential images are produced using three-dimensional tomographic reconstructions of the dielectric profiles before and after the introduction of a contrast agent to a malignant inclusion.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127492472","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: 19
Evolution of magnetic fields in spiral galaxies with the SKA 用SKA观测螺旋星系磁场的演化
2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting Pub Date : 2009-03-24 DOI: 10.1109/ANTEMURSI.2009.4805116
J. Stil
{"title":"Evolution of magnetic fields in spiral galaxies with the SKA","authors":"J. Stil","doi":"10.1109/ANTEMURSI.2009.4805116","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805116","url":null,"abstract":"Polarization of unresolved galaxies allows a statistical study of magnetic fields and Faraday depolarization for large samples of galaxies in the local universe, and at high redshift with the SKA. Models for the integrated polarized emission of spiral galaxy disks suggest that star forming galaxies dominate the polarized source counts detectable with the SKA.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127508263","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
Mutual coupling reduction in MIMO antennas using artificial magnetic materials 利用人工磁性材料减少MIMO天线的互耦
2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting Pub Date : 2009-03-24 DOI: 10.1109/ANTEMURSI.2009.4805043
Mohammed M. Bait Suwailam, M. Boybay, O. Ramahi
{"title":"Mutual coupling reduction in MIMO antennas using artificial magnetic materials","authors":"Mohammed M. Bait Suwailam, M. Boybay, O. Ramahi","doi":"10.1109/ANTEMURSI.2009.4805043","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805043","url":null,"abstract":"In this paper, artificial magnetic resonators are used in order to reduce mutual coupling in Multiple-input Multiple-Output (MIMO) systems. Split-ring resonator (SRR) inclusions are inserted between closely-spaced high-profile monopole antenna elements. It is shown that mutual coupling between the antenna elements can be reduced significantly by incorporating such magnetic inclusions. The magnetic materials work as insulators, and thus can be applied in a variety of antenna applications.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127153279","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: 27
Reduction of mutual coupling between dual-element antennas with new PBG techniques 利用新PBG技术减少双元天线间的互耦
2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting Pub Date : 2009-03-24 DOI: 10.1109/ANTEMURSI.2009.4805076
F. Jolani, A. Dadgarpour, G. Dadashzadeh
{"title":"Reduction of mutual coupling between dual-element antennas with new PBG techniques","authors":"F. Jolani, A. Dadgarpour, G. Dadashzadeh","doi":"10.1109/ANTEMURSI.2009.4805076","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805076","url":null,"abstract":"This paper presents the results of reduction of mutual coupling in closely-packed antennas. The structures include of a simple ground plane and wall that silted pattern etched on a ground plane and the mushroom PBG etched on a wall. It is consequently low cost and simple to fabricate. The isolation of more than -56 dB can be achieved with state-of-the art mushroom PBG loaded on the one wall and with one pair of slit between two parallel microstrip patch antennas; inter-antenna spacing (center to center) is 0.272 λ0. Also we are investigated that with three slits of mushroom PBG on the wall can reduce S12 more than -12 dB. Ground plane size is (0.617 λ0 × 0.376 λ0). In addition the isolation of -37 db can be achieved between two parallel individual planar inverted-F antennas (PIFAs) sharing ground plane and two walls that the mushroom PBG etched on it.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"80 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115047570","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: 14
The DRAO Phased Array Feed Demonstrator: Recent results DRAO相控阵馈源演示器:最新结果
2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting Pub Date : 2009-03-24 DOI: 10.1109/ANTEMURSI.2009.4805124
B. Veidt, T. Burgess, R. Messing, G. Hovey, R. Smegal
{"title":"The DRAO Phased Array Feed Demonstrator: Recent results","authors":"B. Veidt, T. Burgess, R. Messing, G. Hovey, R. Smegal","doi":"10.1109/ANTEMURSI.2009.4805124","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805124","url":null,"abstract":"Future radio telescopes will be used by astronomers to make high-sensitivity wide-band and wide-field surveys of the radio sky. A candidate technology to provide these expanded capabilities is to place high-sensitivity phased-arrays at the focal plane of reflector antennas. Since this technology has not been proven yet, we have constructed the PHased-Array feed Demonstrator (PHAD) with the goal of exploring engineering aspects of this new technology. PHAD comprises 180 densely-packed Vivaldi elements operating from 1 to 2 GHz. Each element feeds a low-noise amplifier and a receiver (both commercial integrated circuits), with the outputs digitized and stored. Beamforming is performed off-line using a matrix language, providing great flexibility in diagnostics and algorithm development. PHAD testing began in a near-field range and has progressed to tests on a dedicated 10-m reflector antenna. Early results (with emphasis on calibration) are reported here.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133244009","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: 24
Compact waveguide orthomode transducer without crossings 紧凑型波导正交换能器无交叉
2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting Pub Date : 2009-02-01 DOI: 10.1109/ANTEMURSI.2009.4805064
N. Fonseca
{"title":"Compact waveguide orthomode transducer without crossings","authors":"N. Fonseca","doi":"10.1109/ANTEMURSI.2009.4805064","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805064","url":null,"abstract":"In this paper we propose a new concept of waveguide orthomode transducer that leads to a design without RF-path crossings. The proposed compact design requires only two layers with standard waveguide cross section for the full power combination network. The design is based on a non-conventional use of the turnstile junction combined with two magic tees to separate two orthogonal polarizations. A preliminary design is presented in Ku-Band to demonstrate the concept. Good performances are achieved over a large bandwidth.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123540675","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
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