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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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Differential LNA considerations for the Square Kilometer Array 平方公里阵列差分LNA的考虑
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.2009.4805044
S. Bhaumik, M. Panahi, D. Kettle
{"title":"Differential LNA considerations for the Square Kilometer Array","authors":"S. Bhaumik, M. Panahi, D. Kettle","doi":"10.1109/ANTEMURSI.2009.4805044","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805044","url":null,"abstract":"This paper summarizes the approach of the implementation of a differential input and single-ended output Low Noise Amplifier for the Square Kilometer Array Development System. A new procedure to test such LNAs has also been proposed here. As a part of the initial approach for this design idea two MIC LNAs have been designed to be tested in the proposed method. Avago Technology's ATF33143 pHEMT transistors have used to develop the designs. LNA1 has a flat gain of more than 30 dB with noise figure of around 0.6 dB. The return losses are also good over the band. The LNA2 displays gain over 28 dB and noise figure less than 0.7 dB almost all across the band. The true differential mixed mode S-parameter response of both the LNAs has been presented here. With success these design and testing procedures would be implemented on future MMIC LNAs to be developed for the SKA.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"24 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":"116899471","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
Experimental validation of thin-wire FVTD models 细丝FVTD模型的实验验证
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.2009.4805126
A. Zakaria, Cameron Kaye, I. Jeffrey, J. Lovetri
{"title":"Experimental validation of thin-wire FVTD models","authors":"A. Zakaria, Cameron Kaye, I. Jeffrey, J. Lovetri","doi":"10.1109/ANTEMURSI.2009.4805126","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805126","url":null,"abstract":"Thin-wire models for the FVTD algorithm are validated using various monopole configurations above a finite ground plane. The thin-wire model is derived from the original Holland-Simpson formulation, extended by Edelvik for the finite-element method, and requires a parameter which dictates the region around each wire wherein coupling between the field variables and the current and voltage variables on the thin wire occurs. It is shown how S11 and S21 parameters can be derived from current and voltage variables on the wire, and these were successfully reproduced for the monopole configurations tested. Both straight and bent monopoles are investigated.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"8 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":"115351314","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
Performance of small primary feeds with E- and H-plane slots E面槽和h面槽小一次进给的性能
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.2009.4805102
M. Qudrat-E-Maula, L. Shafai
{"title":"Performance of small primary feeds with E- and H-plane slots","authors":"M. Qudrat-E-Maula, L. Shafai","doi":"10.1109/ANTEMURSI.2009.4805102","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805102","url":null,"abstract":"In this paper, the performance of small circular waveguide feeds with E- and H-plane slots is investigated. The slots are categorized by small and large slots depending on slot length. It is shown that for small slots, pattern broadening is possible with equal E- and H- plane patterns, at the expense of cross-polarization. For large slots, identical E- and H-plane pattern with pattern broadening is achievable without degrading the cross-polarization. The back lobe level is unaffected for all cases.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"40 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":"129546078","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
Microwave imaging of the knee: On sensitivity, resolution and multiple tears detection. 膝关节微波成像:灵敏度、分辨率和多发撕裂检测。
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.2009.4805109
S. Salvador, E. Fear, M. Okoniewski, J. Matyas
{"title":"Microwave imaging of the knee: On sensitivity, resolution and multiple tears detection.","authors":"S. Salvador, E. Fear, M. Okoniewski, J. Matyas","doi":"10.1109/ANTEMURSI.2009.4805109","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805109","url":null,"abstract":"Microwave imaging has been extensively studied in the past several years as a new technique for early stage breast cancer detection. Besides this, other medical applications were proposed concerning the analysis of cardiac tissues, soft tissues and bones. Recently, the use of radar-based microwave imaging was investigated by the authors for the diagnosis of knee-injuries, with focus on meniscal tears [14]. The results, both numerical and experimental, suggest that radar-based microwave imaging has potential for knee imaging. Imaging tears as small as 3.4 x 8 mm appears feasible, and could be useful for monitoring the progression of degenerative disease after injury. In this paper we report on further investigation of the approach. We performed experimental evaluation of the sensitivity and resolution of the method and of its capability of detecting multiple tears. Results show that tears as small as 1.3 mm x 8 mm are successfully imaged, that multiple tears can be detected and that tears separated by 9 mm can be imaged as distinct lesions.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"24 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":"127337684","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: 10
Low cost low noise phased-array feeding systems for SKA pathfinders 用于SKA寻路器的低成本低噪声相控阵馈电系统
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.2009.4805045
J. D. de Vaate, L. Bakker, E. Woestenburg, R. Witvers, G. Kant, W. V. van Cappellen
{"title":"Low cost low noise phased-array feeding systems for SKA pathfinders","authors":"J. D. de Vaate, L. Bakker, E. Woestenburg, R. Witvers, G. Kant, W. V. van Cappellen","doi":"10.1109/ANTEMURSI.2009.4805045","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805045","url":null,"abstract":"Developments in radio astronomy instrumentation drive the need for lower cost front-ends due to the large number of antennas and low noise amplifiers needed. This paper describes cost reduction techniques for the realization of antennas and low noise amplifiers in combination with a noise budget calculation for array systems in the absence of cryogenic cooling.","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":"123460395","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: 34
Ohmic loss reduction and gain enhancement of microstrip antennas using laminated conductors 利用层压导体降低微带天线的欧姆损耗和增强增益
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.2009.4805085
S. Latif, L. Shafai, C. Shafai
{"title":"Ohmic loss reduction and gain enhancement of microstrip antennas using laminated conductors","authors":"S. Latif, L. Shafai, C. Shafai","doi":"10.1109/ANTEMURSI.2009.4805085","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805085","url":null,"abstract":"In order to enhance the gain of miniaturized microstrip antennas, a novel technique is developed where the conductor of miniaturized ring antennas is formed by depositing multiple conductor layers separated by dielectric lamination. The laminating dielectric thickness is smaller or of the order of the skin depth of the conductor. First, it is shown analytically that when multiple laminated conducting material layers are used for a planar material, the power lost in the material is less compared to the case with a single solid layer. The concept is then used in microstrip ring antennas for enhancing their gain. The use of multiple laminated conductors essentially reduces the ohmic loss of these antennas. Experimental results are discussed to validate the concept.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"106 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":"122681592","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
Investigations on an aperture-coupled microstrip patch antenna with a spaced dielectric cover for enhanced gain performance 带间隔介电罩的孔径耦合微带贴片天线增益性能的研究
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.2009.4805088
C. Meagher, S. Sharma
{"title":"Investigations on an aperture-coupled microstrip patch antenna with a spaced dielectric cover for enhanced gain performance","authors":"C. Meagher, S. Sharma","doi":"10.1109/ANTEMURSI.2009.4805088","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805088","url":null,"abstract":"A novel method for increasing the gain of an aperture-coupled microstrip patch antenna is presented. The method makes use of a dielectric cover that is spaced some height off of the antenna. By proper choice of this height, we demonstrate an increase in simulated gain of more than 7dB. This comes at no cost to the matching bandwidth, but affects the gain bandwidth and radiation beamwidth.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"60 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":"128554977","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
Numerical simulations of parametric amplification of space charge waves in Zincblende structure n-GaN film 锌闪锌矿结构n-GaN薄膜中空间电荷波参量放大的数值模拟
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.2009.4805068
A. García-b., V. Grimalsky
{"title":"Numerical simulations of parametric amplification of space charge waves in Zincblende structure n-GaN film","authors":"A. García-b., V. Grimalsky","doi":"10.1109/ANTEMURSI.2009.4805068","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805068","url":null,"abstract":"Three-wave non-linear interactions of space charge waves (SCW) in n-GaN films placed onto a semi-infinite substrate, possessing the negative differential mobility, are analyzed and simulated numerically. An effective frequency up-conversion with amplification in millimeter wave range is demonstrated. When compared with a case of the n-GaAs film, it is possible to observe an amplification of SCW in n-GaN films of submicron thicknesses at essentially higher frequencies f ≥ 100 GHz.","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":"128091257","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
Metamaterial-inspired engineering of antenna systems 天线系统的超材料工程
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.2009.4805127
R. Ziolkowski
{"title":"Metamaterial-inspired engineering of antenna systems","authors":"R. Ziolkowski","doi":"10.1109/ANTEMURSI.2009.4805127","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805127","url":null,"abstract":"A number of advances in the use of metamaterials and metamaterial-inspired structures to improve the overall efficiency and bandwidth performance of electrically small antennas (ESAs) in the VHF, UHF and microwave regimes will be reviewed.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"20 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":"114678506","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
Radio spectrum variations in supernova remnants 超新星残骸的无线电频谱变化
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.2009.4805087
D. Leahy, T. Wenwu
{"title":"Radio spectrum variations in supernova remnants","authors":"D. Leahy, T. Wenwu","doi":"10.1109/ANTEMURSI.2009.4805087","DOIUrl":"https://doi.org/10.1109/ANTEMURSI.2009.4805087","url":null,"abstract":"Supernova remnants are prominent sources of astronomical radio emission within our galaxy. The mechanism is synchrotron radiation from relativistic electrons and the observed spectrum depends on the relativistic electron spectrum and propagation effects from the source to the observer. Here the electron spectrum and radio absorption effects are discussed and compared with recent observations of galactic supernova remnants.","PeriodicalId":190053,"journal":{"name":"2009 13th International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting","volume":"471 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":"130795239","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
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