SBMO International Microwave Conference/Brazil,最新文献

{"title":"Class-AB Power Amplifier Design Guidelines","authors":"F. Giannini, G. Leuzzi, E. Limiti, L. Scucchia","doi":"10.1109/SBMO.1993.589535","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589535","url":null,"abstract":"The design of high-power high-efficiency narrowband amplifiers implies a carefull choice of bias point, loading and power level. The choice of class A, AB, B, or C is based on a compromise between gain , output power, efficiency and total and/or specific distortion content[1]. Qualitative and quantitative considerations must therefore be made by the designer in order to obtain the best performances from a power stage [2-7]. A detailed study of a power amplifier can be performed either experimentally (load-pull measurements [9]). General guidelines and quick design procedure are however highly desirable for the sake of precious design time saving and of clarity of interpretation of the results; alternatively, they can be used to get an accurate staring poin for further optimisation. This is particularly important in the field of monolithic microwave integrated circuits where the optimisation procedure in the phase of the software \"breadbording\" represents a real crucial step. The contribution of this paper is to give design guidelines consisting of a simple and reliable anlysis method together with design tables; the results have been veritied by comparison with a more accurate but lengthy non-linear analysis programme.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"15 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":"133032976","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":"Input Impedance Of Conformal Cylindrical Microstrip Antennas Covered By A Protection Layer","authors":"C.M. daSilva, J. da Silva Lacava, F. Pillon Richards","doi":"10.1109/SBMO.1993.587206","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587206","url":null,"abstract":"This paper presents ,a model for the calculation of the input impedance of probe fed conformal cylindrical microstrip antennas covered by a protection layer. The model is based on the Green’s function for the multilayered cylindrical structure calculated in the Fourier domain. The moment method is used to :solve the integral equation resulting from the application of the pertinent boundary conditions, and to obtain the unknown current distribution over the patch. The input impedance of a probe fed wraparound antenna is calculated by using the proposed model.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"64 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":"121451210","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":"New Topologies For Field Effect Transistor Models","authors":"P. Roblin","doi":"10.1109/SBMO.1993.587239","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587239","url":null,"abstract":"This paper reviews the developmerit of unified smallan'd large-signal models for the highfrequency simulation of FET circuits. In particular recent charge-conserving non-quasistatic topologies for FET models are discussed. The associated parameter extraction and the implementation of these FET models in a circuit simulator are also addressed.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"567 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":"123162012","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":"New Model Of Microstrip Non-symmetrical Double Step Discontinuties","authors":"F. Giannini, G. Bartolucci, S. Ciorciolini, E. Limiti","doi":"10.1109/SBMO.1993.589381","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589381","url":null,"abstract":"The continuous increase in working frequency and the widespread diffusion of monolithic microwave integrated circuits requires the development of models based on a wide-band approach and not just on a quasi-static approximation that limits their validity at a much lower frequency range. In recent papers [1,2], an equivalent circuit has been presented for the double-step microstrip discontinuity for the symmetric case; on the other hand, during MMIC design process, layout constraints often force to consider the asymmetric discontinuity. In this paper the non-symmetric case is considered, and a more general equivalent circuit is derived. A planar electromagnetic approach, which intrinsically insures broadband validity, has been utilized, obtaining a circuit whose lumped elements are frequency independent . A comparison with experimental data confirms the effectiveness of the proposed model.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"9 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":"133914127","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":"Important Considerations Relating To GaAs Fet Power Amplifiers Intended For Use In Radar Systems","authors":"J.L.B. Walker","doi":"10.1109/SBMO.1993.589543","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589543","url":null,"abstract":"This paper will review the relative merits of class A and class B bias for GaAs FET power amplifiers intended for use in radar systems. Aspects to be considered are power and efficiency in the gain compression/saturation region as a function of bias point, gain degradation in class B compared with class A, and range sidelobes resulting from pulsed operation and its implications for the pulse compression system.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"98 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":"132652389","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":"Slab Waveguide Three-Level Model For An Optical Amplifier","authors":"H. Kalinowski, Á. Guzmán","doi":"10.1109/SBMO.1993.587233","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587233","url":null,"abstract":"Continuous wave optical amplification in a slab waveguide can be simulated by means of the scalar Beam Propagation Method, taking in account signal and pump field propagahon through t,he waveguide. We nsed a t,hree-level scheme for the pump ~ amplification process, which reproduces the main experimental features of Erbium Doped Fiber Amplifiers pumped at 1.48pm, as reported by the COST 217 Project Group, for both short and long amplifier lengths. An alternative procedure, ablr t o reduce computational time by a large factor, is presented.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"70 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114011965","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":"Broadside Suspended Stripline 3 dB Couplers","authors":"C.V. Borges Maciel, D. Argollo, H. Abdalla","doi":"10.1109/SBMO.1993.589382","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589382","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"25 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":"133647672","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":"Modern Hiqh Power Electron Tubes","authors":"H. Doring","doi":"10.1109/SBMO.1993.589563","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589563","url":null,"abstract":"High frequency power in the kW to MW range is increasingly used today for high energy physical research as in particle accelerators and in fusion studies. F. i. such power levels are applied at 28 140 GHz for electron cyclotron resonance heating of magnetically confined plasmas. But also at lower frequencies as f. i. industrial equipment they are of growing interest. These high powers can only be generated in electron tubes since semiconductor devices cannot tolerate the rather high loss power associated with the high frequency generation.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"3 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":"125975430","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":"Wirelessness - An Emerging Craze: An Overview Of Wireless Applications, Technology And Issues","authors":"A. Khanna","doi":"10.1109/SBMO.1993.587201","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587201","url":null,"abstract":"Introduction: The first ''wireless craze\" began in the 1920's with the inciredible demand for radio broadcast services by the public. Of colme the demand for radio communications has grown over the years, with progress including the satellite communications of tlhe 1970's. The recent \"wireless craze,\" though, may be even more significant for the human race. Since the 1920's the wireless technology has literally gone through a metamorphosis. Our world has greatly shrunk due to vast expansion in means of transportation and communication. The: needs of people are very different today and the emerging wireless craze will influence, include almost every sphere and aspect of life. The surge in growth of applications for microwave and RF technology in the commercial markets has been a pleasant surprise for every one in the field. In the past, developments in microwave technology have traditionally been driven by defense applications. Now, however, the global political movement toward peace and demilitarization has for the past few years caused a significant downtrend in the defense applications for microwave and RF equipment -creating a great deal of pressure on technologists and investors to look for new applications of this mature technology. In less than a five years a number of exciting applications have appeared and a great number more are on the way. Global wireless communicaitions are now in sight, the cellular radio market is well establishied, high-speed wireless LANs are a reality, and the first of the PCS and CT-2 have been deployed. People's fieedom of movement will no longer be determined by the length of a telephone cord. The need for complex wiring plans to service computer networks will soon disappear. Of course, there are still questions regarding standards, spectrum allocations and modulation schemes, but the kture is cllear and it is wireless. In this paper we will review some of the applications of the wireless technology. Communications being the single largest application, the focus of the discussion will be on communications related applications, with a relatively brief recognition being given to non-communications applications. We will review the status and future needs of the technology driving the wireless applications, as well as the regulatory, standardization and health issues affecting the applications.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"86 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":"122285614","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":"Radiation Properties Of Chirostrip Antennas","authors":"F. Lumini, J. da Silva Lacava","doi":"10.1109/SBMO.1993.587217","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587217","url":null,"abstract":"This paper presents a method to study the radiation properties of chirostrip antennas. Working in the Fourier domain, transformed Green's functions composed by compact and closed form expressions, can be obtained. The fields radiated by the antenna are calculated through an asymptotic expression obtained by the stationary phase method. Using this formulation, the peculiar effects of the chiral substrate on the radiation properties of a short printed dipole, are analyzed.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"113 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":"124104411","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}