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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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Reducing crosspolarization of an offset reflector antenna using a dual-mode horn feed 利用双模喇叭馈电减少偏置反射器天线的交叉极化
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.2009.4805041
Z. A. Pour, L. Shafai
{"title":"Reducing crosspolarization of an offset reflector antenna using a dual-mode horn feed","authors":"Z. A. Pour, L. Shafai","doi":"10.1109/ANTEMURSI.2009.4805041","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805041","url":null,"abstract":"The effect of a dual-mode circular horn antenna, as a feed in offset reflector antennas, on the crosspolarization field is studied using the physical optics, geometrical optics, and geometrical theory of diffraction software GRASP. It will be shown that, one can reduce the crosspolarization of an offset reflector antenna by properly exciting two modes in circular horn antenna. These two modes are the fundamental mode, TE11, and the higher order mode, TE21. The results for some offset reflectors, with different f/D ratios, will be presented to investigate the above property.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"94 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":"127004196","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
Planar antennas for far-field beam steering at end-fire using directive surface-wave launchers 平面天线的远场波束导向在末火使用的定向表面波发射器
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.2009.4805100
S. Podilchak, A. Freundorfer, Y. Antar
{"title":"Planar antennas for far-field beam steering at end-fire using directive surface-wave launchers","authors":"S. Podilchak, A. Freundorfer, Y. Antar","doi":"10.1109/ANTEMURSI.2009.4805100","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805100","url":null,"abstract":"Planar antennas that achieve end-fire radiation by surface-wave (SW) edge diffraction are investigated. Specifically, Yagi-Uda like directive surface-wave launchers (SWLs) are utilized as the surface-wave antenna (SWA) feed, exciting cylindrical SWs on a grounded dielectric slab (GDS). With the design of a recessed ground plane, suitable conditions are achieved for far-field radiation at end-fire. In addition, a novel SWA offering end-fire beam steering is also presented by using a two element array of SWLs. Measured results suggest that the radiated beam pattern can be steered by 8° from φ = −4° to φ = +4° in the far-field. In addition, highly directive beam patterns are observed from 18.5 – 22.7 GHz suggesting a relatively large radiating bandwidth. To the authors knowledge this is the first time such planar SWAs have been fabricated and measured.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"2 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":"117119008","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
Modified TEM horn antenna for wideband applications 用于宽带应用的改进TEM喇叭天线
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.2009.4805077
F. Karshenas, A. Mallahzadeh, A. Imani
{"title":"Modified TEM horn antenna for wideband applications","authors":"F. Karshenas, A. Mallahzadeh, A. Imani","doi":"10.1109/ANTEMURSI.2009.4805077","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805077","url":null,"abstract":"This paper presents a novel method to enhance the pattern characteristics of the TEM horn antenna for 2−19 GHz frequency band. The conventional TEM horn antenna introduces some fluctuations in the main lobe radiation pattern over the center frequencies, which are 10−15 GHz. This motivated us to propose a new method to remove the aforementioned impact by carving an arc shape to the open end of exponentially tapered plates. The associated curvature of this arc is optimized to completely remove the aforementioned fluctuation. The simulation results show that the improved TEM horn antenna structure exhibits low VSWR as well as good radiation pattern over 2−19 GHz frequency band.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"28 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":"117243517","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: 25
Beamforming and imaging with the BYU/NRAO L-band 19-element phased array feed 杨百翰大学/NRAO l波段19元相控阵馈源的波束形成和成像
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.2009.4805125
K. Warnick, B. Jeffs, J. Landon, J. Waldron, D. Jones, J. Richard Fisher, R. Norrod
{"title":"Beamforming and imaging with the BYU/NRAO L-band 19-element phased array feed","authors":"K. Warnick, B. Jeffs, J. Landon, J. Waldron, D. Jones, J. Richard Fisher, R. Norrod","doi":"10.1109/ANTEMURSI.2009.4805125","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805125","url":null,"abstract":"An experimental 19-element L-band phased array feed was installed on the Green Bank 20-Meter Telescope in October 2007 and July 2008 to measure sensitivity and effciency and demonstrate signal processing algorithms for array calibration, multiple beam formation, imaging, and adaptive spatial filtering methods for interference mitigation. System noise performance was characterized using a warm absorber/cold sky Y-factor setup. The peak beam aperture effciency was 69% and the minimum beam equivalent system temperature was 66K. With a single reflector pointing, a high sensitivity image of a field of view approximately two half-power beamwidths in diameter can be produced. Measured figures of merit compare well to numerical simulations, indicating that complicating effects such as mutual coupling are understood well enough to enable the next phase of array feed development to proceed on firm grounds.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"51 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":"117280658","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: 39
A dual polarized CPW-Fed aperture-coupled stacked patch 一种双极化CPW-Fed孔径耦合叠加贴片
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.2009.4805065
S. Foo
{"title":"A dual polarized CPW-Fed aperture-coupled stacked patch","authors":"S. Foo","doi":"10.1109/ANTEMURSI.2009.4805065","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805065","url":null,"abstract":"This paper presents concept of a broadband, dual-polarized aperture-coupled stacked patch fed by coplanar waveguide (CPW). The isolated ground planes in a coplanar feed line are known to support various unwanted propagation modes, which lead to severe degradation in antenna performances, especially the isolation between two orthogonally polarized channels. Consequently, it is very difficult to feed a dual polarized CPW-fed patch and achieve good isolation between two polarizations, especially in the case of an aperture-coupled patch where a back-cavity is required. The proposed structure eliminates these couplings between the orthogonal feed-lines by using an H-slot feed and an E-slot feed in a symmetrical collinear geometry. This method enables collocation of two orthogonally polarized radiators within close proximity with a relatively broad frequency bandwidth of over 25% (VSWR 1.5:1) and good isolation of typically 30dB between the two polarizations.","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":"123678541","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
Source exciation effects on power radiation from material and metamaterial resonances 材料和超材料共振源激发对功率辐射的影响
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.2009.4805112
L. Shafai, M. Ng Mou Kehn
{"title":"Source exciation effects on power radiation from material and metamaterial resonances","authors":"L. Shafai, M. Ng Mou Kehn","doi":"10.1109/ANTEMURSI.2009.4805112","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805112","url":null,"abstract":"The radiated power from a slotted spherical dipole antenna coated with dual layers of materials and metamaterials is determined. The excitation is assumed to be due to a constant applied voltage at the slot. It is shown that the radiated power is dependent on the coating parameters and, in particular, it can increase dramaticallyi at the mode resonances. The problem is solved using a boundary value problem formulation, and determining the mode coefficients, using a matrix inversion. It is found that, at mode resonances the coefficients of the resonating mode becomes excessively large, and the radiation is due to the resonant mode alone. Using this finding, it is shown that the computed excessive radiated power is due to the assumed slot excitation, which can occur with any coating material when a particular mode becomes resonant.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"43 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":"127095140","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
Signal detection performance in indoor environments with a synthetic antenna array 合成天线阵列在室内环境下的信号检测性能
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.2009.4805048
A. Broumandan, J. Nielsen, G. Lachapelle
{"title":"Signal detection performance in indoor environments with a synthetic antenna array","authors":"A. Broumandan, J. Nielsen, G. Lachapelle","doi":"10.1109/ANTEMURSI.2009.4805048","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805048","url":null,"abstract":"This paper analysis the performances of a single antenna handheld receiver in detecting a signal in a Rayleigh multipath fading environment. If the antenna is spatially fixed during the time interval that the signal is sampled then signal coherency is maintained. However, the signal will be subject to statistically large fading losses. The alternative is to spatially translate the antenna along some arbitrary random trajectory during the snapshot interval. It will be shown that a significant net processing gain resulting from randomly moving the antenna relative to keeping it stationary is achievable. It is further demonstrated that for a given utilization scenario, there is an optimum trajectory size which maximizes the processing gain advantage of the moving antenna. An extensive set of measurements based on CDMA-2000 pilot signals propagated from outdoor terrestrial base stations, captured in indoor multipath environments using stationary and moving antennas are used to experimentally verify these theoretical findings.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"34 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":"132514907","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
Comparison of microwave and laser surface detection for microwave imaging systems 微波与激光表面探测在微波成像系统中的比较
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.2009.4805051
T. Cameron, T. Williams, J. Bourqui, M. Okoniewski, E. Fear
{"title":"Comparison of microwave and laser surface detection for microwave imaging systems","authors":"T. Cameron, T. Williams, J. Bourqui, M. Okoniewski, E. Fear","doi":"10.1109/ANTEMURSI.2009.4805051","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805051","url":null,"abstract":"Radar-based microwave breast imaging techniques involve transmitting and receiving microwave pulses from a number of antenna locations. The data collected benefit from antenna positions that are within a certain range relative to the breast surface. Thus a requirement for prior knowledge of the breast size, shape, and location arises. This paper presents application of a laser sensor to estimate a number of points on the surface of simple breast phantoms. Results demonstrate faster scan times as well as improved results when using a laser sensor.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"5 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":"130281586","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
Investigation on vee dipole antennas for ultra wideband applications 超宽带应用的v型偶极子天线研究
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.2009.4805093
A. Mohamed, L. Shafai
{"title":"Investigation on vee dipole antennas for ultra wideband applications","authors":"A. Mohamed, L. Shafai","doi":"10.1109/ANTEMURSI.2009.4805093","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805093","url":null,"abstract":"This paper investigates the performance of Vee dipole antennas with novel arm configurations for ultra wideband applications. The antennas are designed to work over the frequency band from 3 to 11 GHz. Impedance bandwidth and radiation pattern characteristics for different antenna designs are compared and discussed. Dipole arms with matching strips in the feeding region along with tapering of the longitudinal length (L) are selected to support radiation in the desired direction. Parametric study is conducted on the appropriate Vee angle, arm length and arm shape on the antenna characteristics. Finally methods to increase directivity and reduce the back radiation are investigated; scaled shaped arms are used as directors.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"29 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":"116727528","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
RCS of circular carbon NANO tube antenna array 圆形碳纳米管天线阵列的RCS
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.2009.4805060
H. Zareie, N. Davoudzadeh, M. Tafazoli, Ghafoori Fard, Mohajerzadeh Hasan, Shamsoddin
{"title":"RCS of circular carbon NANO tube antenna array","authors":"H. Zareie, N. Davoudzadeh, M. Tafazoli, Ghafoori Fard, Mohajerzadeh Hasan, Shamsoddin","doi":"10.1109/ANTEMURSI.2009.4805060","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805060","url":null,"abstract":"A novel THz antenna structure, made of carbon nanotube arrays is suggested. Using CST MICROWAVE STUDIO (CST MWS), the capabilities of carbon nanotube terahertz (THz) antenna arrays have been simulated and this CNT antenna array has been fabricated.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"37 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":"133721351","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
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