SBMO International Microwave Conference/Brazil,最新文献

{"title":"Advances In Microwave Active","authors":"R. Bonetti, A.E. Williams","doi":"10.1109/SBMO.1993.589358","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589358","url":null,"abstract":"Recent advances in microwave active filter design and realization are described.The techniques discussed include: transversal and recursive, cascading of transfer functions, predistortion, negative feedback and Q enhancement. A brief discussion of the merits and potential problem areas is presented along with experimental results obtained with both wide and narrow-band MMIC active filters. Introduction Recent trends in microwave components and circuits point in the direction of fully integrated subsystems that can be fabricated in large numbers at low recurring cost. The most popular solution for this requirement has been the design and realization of complete subsystems in monolithic integrated circuit (MMIC) form. A large number of devices have been succesfully implemented in MMIC with a high level of integration and performance, these include: low-noise amplifiers, switches, medium power amplifiers, oscillators, mixers and complete receiver front ends (involving the realization of a number of the above devices in a single ship). The microwave components that have so far lagged behind in this rush for miniaturization are those that require high unloaded Q factors such as band-pass filters and multiplexers. The difficulty involved in the size reduction of these devices is related to the rapid increase of ohmic losses with decreasing circuit sizes, which leads to low unloaded Q factors; about 30 to 150 for lumped or distributed resonators realized in MMIC, respectivelly. Over the past few years a number of techniques have been suggested and implemented to circumvent this problem. The purpose of this paper is to review some of these approaches, point out their advantages and disadvantages and present recent data obtained with a wide-band, cascaded function topology and a new realization of Q enhanced narrow-band MMIC active bandpass filter. Review of Design Techniques Four basic active filter design approaches have been succesfully implemented in the microwave range: transversal and recursive [ 1],[2] transfer function cascading [3],[4] negative feedback [5] Q enhanced resonators [6],[7I,l81. The transversal and recursive approaches are based on distributed filter concepts, borrowed from low frequency digital applications. The desired frequency domain filter shape results by combining a number of amplitude weighted, delayed signals as a truncated Fourier series(see Figures l a and lb). The sharpness of the filter slope at band edges (or selectivity) is proportional to the number of elements retained in the Fourier expansion which leads to practical limitations on the maximum out-of-band rejection obtained with this approach when circuit size is a design constraint. Another limitation is the spurious passbands, intrinsic to this design, that appear at harmonic frequencies [9].","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124462666","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":"European MMIC Commercial Applications","authors":"F. Giannini, A. M'baye, E. Pettenpaul","doi":"10.1109/SBMO.1993.587242","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587242","url":null,"abstract":"The present European coordinate activities into the field of MMIC's for commercial applications are presented, and some of the most interesting achievements illustrated. The unique role played by the European Community Programs, like ESPRIT and EUREKA, in order to make up the foundation of a 111-V commercial industry, is also highlighted.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123780591","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":"Frequency Multipliers For Submillimeter Wavelengths","authors":"A. Raisanen","doi":"10.1109/SBMO.1993.589548","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589548","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123805519","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":"Experimental Synchronous 10 Gbit/s Transmission System For Optical Fibers","authors":"G. Hanke","doi":"10.1109/SBMO.1993.587226","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587226","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115215416","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":"Shaped Beam Reflector Antennas For The C-band Brasilsat Case","authors":"J. Bergmann, Larissa N. da Costa","doi":"10.1109/SBMO.1993.589393","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589393","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122544812","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":"Recent Achievements In Microwave Optoelectronic Circuits","authors":"T. Berceli","doi":"10.1109/SBMO.1993.587224","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587224","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114258164","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":"Transimpedance Amplifiers Using AiGaAs/GaAs HBTs: A Comparative Study","authors":"J. W. Swart, D.B. Slaier, A.S. Lujan, P.M. Enquist, E. Martins","doi":"10.1109/SBMO.1993.589534","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589534","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"223 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122184407","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":"1-1 8GHz Monolithic Distributed Amplifier With Lumped And Distributed Elements","authors":"J. P. Torres, T. Parra, J. C. Freire","doi":"10.1109/SBMO.1993.587244","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587244","url":null,"abstract":"In this paper will be presented the design technique of a monolithic distributed amplifier, designed to obtain the widest bandwidth wi th the highest gain/device and lowest area. The procedure starts with the assumption of ideal devices and theoretical constrains for their values. On a step by step optimisation process, real device models and reduced catnstrains on their values were introduced. A 3 stage amplifier with 3.75k0.5clB from 1-1 8GHz was designed, fabricated and tested. The chip total area is 2~3tnm2. Experimental and sirnulation results will be presented.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129726160","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 New Microwave Oven For Efficient Uniform Heatinu Based Upon A Circular Cylindrical Geometry","authors":"M. Brodwin, J. Chang","doi":"10.1109/SBMO.1993.587236","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587236","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"159 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114843319","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":"Real-time Sar Processing At DLR","authors":"A. Moreira","doi":"10.1109/SBMO.1993.589546","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589546","url":null,"abstract":"This paper presents the conceptual design of the high resolution, real-time SAR (Synthetic Aperture Radar) processor for the experimental SAR-System of DLR. The new technique used in the real-time processor and the preliminary results are also presented.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124046955","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}