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Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference最新文献

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Prediction of optimum large-signal microwave MESFET efficiency in multiplication and power amplification 大信号微波MESFET最佳倍增和功率放大效率的预测
Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Pub Date : 1995-07-24 DOI: 10.1109/SBMOMO.1995.509649
M. Yagoub, S. Chouai, H. Baudrand, A. Neto
{"title":"Prediction of optimum large-signal microwave MESFET efficiency in multiplication and power amplification","authors":"M. Yagoub, S. Chouai, H. Baudrand, A. Neto","doi":"10.1109/SBMOMO.1995.509649","DOIUrl":"https://doi.org/10.1109/SBMOMO.1995.509649","url":null,"abstract":"A method is described which enables the optimum large-signal efficiency to be obtained for a microwave active device independently of the required nonlinear function. The technique consists of determining the volume surrounded by a surface called the \"characteristic surface\" including all the allowed powers at the terminal ports of the nonlinear component in order to deduce its optimum \"intrinsic\" powers and then its corresponding optimum efficiency. Applied to MESFETs, the design of both a frequency multiplier and a power amplifier permits one to validate this method.","PeriodicalId":225072,"journal":{"name":"Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129238432","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
Radar magnetrons: international and Brazilian Air-Force scenarios 雷达磁控管:国际和巴西空军方案
Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Pub Date : 1995-07-24 DOI: 10.1109/SBMOMO.1995.509665
G. Alves
{"title":"Radar magnetrons: international and Brazilian Air-Force scenarios","authors":"G. Alves","doi":"10.1109/SBMOMO.1995.509665","DOIUrl":"https://doi.org/10.1109/SBMOMO.1995.509665","url":null,"abstract":"Microwave high power technology would not be conceivable without the early development of the radar magnetron by H.A.H. Boot, J.T. Randall, and their associates in England in late 1939. It is pointed out that with an appropriate substitution of the conventional fixed frequency or mechanically tuned strapped anode structures for the coaxial anode structure coupled with a sophisticated tuning mechanism one can upgrade the dated Brazilian Air-Force radar systems. This retrofitting approach can be installed in the existing airborne and ground-based radar. It represents a low percentage of the total radar cost, about 10-15% of the original system cost. Therefore, an economical and attractive program can be accomplished by the civil and military government sectors working together towards common objectives.","PeriodicalId":225072,"journal":{"name":"Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123996335","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
Near field solutions for chirostrip printed dipoles 线带印刷偶极子的近场解
Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Pub Date : 1995-07-24 DOI: 10.1109/SBMOMO.1995.509630
F. Lumini, J. C. da S. Lacava
{"title":"Near field solutions for chirostrip printed dipoles","authors":"F. Lumini, J. C. da S. Lacava","doi":"10.1109/SBMOMO.1995.509630","DOIUrl":"https://doi.org/10.1109/SBMOMO.1995.509630","url":null,"abstract":"Numerical solutions for near electromagnetic fields excited by short dipoles printed on grounded chiral slabs are presented. Using the full-wave spectral-domain analysis method developed for open chirostrip structures, expressions for electromagnetic field components are obtained. The effects of chirality on the near field distributions and on the dispersion curves of the surface wave modes are discussed. The results of this investigation confirm that all guided modes are hybrid and that bifurcated modes, currently observed in other chirowaveguide structures, are absent in grounded chiral slabs.","PeriodicalId":225072,"journal":{"name":"Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference","volume":"25 1-3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114026110","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
Flexible IF processors for future communications payloads 用于未来通信有效载荷的灵活中频处理器
Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Pub Date : 1995-07-24 DOI: 10.1109/SBMOMO.1995.509620
P. Barretto
{"title":"Flexible IF processors for future communications payloads","authors":"P. Barretto","doi":"10.1109/SBMOMO.1995.509620","DOIUrl":"https://doi.org/10.1109/SBMOMO.1995.509620","url":null,"abstract":"This paper presents an IF processor built around a \"brick-wall\" named BIFFAC, using SAW filters, ASICs and FPGAs on just one multilayer printed circuit board. This BIFFAC provides the input multiplexing of a 21 MHz bandwidth to up to 4 outputs having independently programmable sub-bands, in steps of 3 MHz, and gains of up to 31 dB by 1 dB steps. A breadboard of one IF processor using 3 BIFFACs has been built, emulating a flexible payload, interconnecting two up-links to two down links. Measurements results and hardware photos are presented.","PeriodicalId":225072,"journal":{"name":"Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference","volume":"51 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126001927","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
Application of microwave techniques in agricultural research 微波技术在农业研究中的应用
Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Pub Date : 1995-07-24 DOI: 10.1109/SBMOMO.1995.509608
A. Kraszewski, S. Nelson
{"title":"Application of microwave techniques in agricultural research","authors":"A. Kraszewski, S. Nelson","doi":"10.1109/SBMOMO.1995.509608","DOIUrl":"https://doi.org/10.1109/SBMOMO.1995.509608","url":null,"abstract":"Microwave techniques, methods and instrumentation can be utilized to increase and improve efficiency of crop production and enhance crop quality. Some examples of successful applications of microwaves in agriculture are presented, and future prospects are discussed. The applications of microwave reflected waves for agricultural purposes discussed are related mainly to various applications of radar.","PeriodicalId":225072,"journal":{"name":"Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122261136","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: 16
Patterning of poly-3BCMU nonlinear waveguides 多3bcmu非线性波导的图像化
Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Pub Date : 1995-07-24 DOI: 10.1109/SBMOMO.1995.509659
L. Palchetti, D. Grando, E. Giorgetti, S. Sottini, Qu Li
{"title":"Patterning of poly-3BCMU nonlinear waveguides","authors":"L. Palchetti, D. Grando, E. Giorgetti, S. Sottini, Qu Li","doi":"10.1109/SBMOMO.1995.509659","DOIUrl":"https://doi.org/10.1109/SBMOMO.1995.509659","url":null,"abstract":"Experimental studies of the photobleaching technique is reported in the case of spin coated films of poly-3BCMU. This technique was utilized to fabricate tapered waveguides, gratings and waveguide lenses. The authors' results confirm the potential of photobleaching for polymer based nonlinear integrated optics.","PeriodicalId":225072,"journal":{"name":"Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127961195","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
The use of automatic differentiation in advanced non-linear modelling of microwave active devices 自动微分在微波有源器件高级非线性建模中的应用
Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Pub Date : 1995-07-24 DOI: 10.1109/SBMOMO.1995.509624
P. Feldmann, V. Cojocaru, T. Brazil
{"title":"The use of automatic differentiation in advanced non-linear modelling of microwave active devices","authors":"P. Feldmann, V. Cojocaru, T. Brazil","doi":"10.1109/SBMOMO.1995.509624","DOIUrl":"https://doi.org/10.1109/SBMOMO.1995.509624","url":null,"abstract":"We describe the use of a novel, flexible and highly modular simulation environment called Sframe, in microwave device modelling and circuit simulation. The software architecture of Sframe is based on object orientation, automatic differentiation and the use of off-the-shelf numerical codes. We present the first tests with the implementation of an advanced nonlinear GaAs FET model in Sframe. This general purpose model, introduces novel solutions, particularly with respect to the modelling of the gate charge, gate capacitances and the RF dispersion of the transconductance and output conductance. The use of automatic differentiation techniques and the modularity of Sframe, lead to very compact model codes, simplifies the implementation process and eliminates many common sources of error. DC and small-signal AC simulation tests have been successfully carried out and the results are shown for the case of a 0.5 /spl mu/m GaAs MESFET.","PeriodicalId":225072,"journal":{"name":"Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134441447","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
Adaptive Volterra processor for fringe order identification in white-light interferometric systems 用于白光干涉系统条纹阶辨识的自适应Volterra处理器
Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Pub Date : 1995-07-24 DOI: 10.1109/SBMOMO.1995.509654
M. Rizk, D. Romare, K. Grattan, A. W. Palmer
{"title":"Adaptive Volterra processor for fringe order identification in white-light interferometric systems","authors":"M. Rizk, D. Romare, K. Grattan, A. W. Palmer","doi":"10.1109/SBMOMO.1995.509654","DOIUrl":"https://doi.org/10.1109/SBMOMO.1995.509654","url":null,"abstract":"Comparatively high success rates with the application of linear adaptive least mean square (LMS) algorithms to identify the zero order fringe in the presence of additive Gaussian noise only have been reported in spatially-scanned white-light interferometric (WLI) systems. However, when the corrupting noise causing the problems with fringe identification is signal-dependent and/or exhibits transient behaviour mainly attributable to mechanical vibrations (shocks) in such systems, nonlinear filtering accompanied by a suitable adaptation algorithm should lead to better overall performance. The paper presents a study conducted to appraise the use of Volterra processors in conjunction with adaptive LMS, against the linear filtering counterpart previously published, when the analogue-to-digital (A/D) converters employed in the interferometric system introduce quadratic and/or cubic nonlinearity distortion. The paper also attempts to resolve the linear/nonlinear modelling dilemma of a suspected kind of nonlinearity due to chromatic aberration effects which manifests two important characteristics in the fringe pattern, namely, skewness and nonGaussianity. It is shown that the Volterra processor produces less satisfactory results than a linear filter with optimal choice of the step size parameter. Thus contradicting the hypothesis which regards the effects of chromatic aberrations as nonlinear.","PeriodicalId":225072,"journal":{"name":"Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference","volume":"309 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133694687","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
Differential rain attenuation in converging links 汇聚环节的雨水衰减差异
Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Pub Date : 1995-07-24 DOI: 10.1109/SBMOMO.1995.509675
L. S. Silva Mello, N. Dhein, E. Costa, C. M. Einloft, G. L. Siqueira
{"title":"Differential rain attenuation in converging links","authors":"L. S. Silva Mello, N. Dhein, E. Costa, C. M. Einloft, G. L. Siqueira","doi":"10.1109/SBMOMO.1995.509675","DOIUrl":"https://doi.org/10.1109/SBMOMO.1995.509675","url":null,"abstract":"This paper presents results of differential attenuation measurements in 6 terrestrial line-of-sight microwave links with a common end at Sao Paulo, in the tropical region of Brazil. One link operates at 18 GHz and five links at 15 GHz. An empirical method used to estimate the differential attenuation exceeded at a given percentage of time as a function of the angle between links and their path length difference was developed based on the experimental results.","PeriodicalId":225072,"journal":{"name":"Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133299261","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 optical source for generation of 40-60 GHz signals using a dual mode multisection DFB semiconductor laser 使用双模多段DFB半导体激光器产生40-60 GHz信号的新光源
Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Pub Date : 1995-07-24 DOI: 10.1109/SBMOMO.1995.509694
C. R. Lima, P. Davies, D. Wake
{"title":"A new optical source for generation of 40-60 GHz signals using a dual mode multisection DFB semiconductor laser","authors":"C. R. Lima, P. Davies, D. Wake","doi":"10.1109/SBMOMO.1995.509694","DOIUrl":"https://doi.org/10.1109/SBMOMO.1995.509694","url":null,"abstract":"A new optical source for generation of pure and high power millimetre-wave signals between 40-60 GHz using a dual mode multisection semiconductor laser is demonstrated. Phase-locked millimetre-waves are generated with extremely narrow linewidth (<10 Hz) and wide locking range (/spl sim/500 MHz).","PeriodicalId":225072,"journal":{"name":"Proceedings of 1995 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132700637","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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