SBMO International Microwave Conference/Brazil,最新文献

{"title":"Properties Of Composite Chiral - Ferrite Media","authors":"C. Krowne","doi":"10.1109/SBMO.1993.587216","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587216","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"75 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":"116618688","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":"The Six-Port Technique: A Brief Review","authors":"A. J. Belfort de Oliveira, S.P.X. Neto","doi":"10.1109/SBMO.1993.587235","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587235","url":null,"abstract":"The 's' parameters of microwave devices have been satisfactorily measured by the usual network analyzer for the last few decades. The principle of its operation requires a complex circuitry which has to convert tihe reference and test signals to an intermediate frequency while keeping the same phase and amplitude relation between them. This makes the equipment very complex and expensive especially at millimeter wavelengths. A cheaper and practical alternative for the network analyzer was introduced by Glenn Engen and Cletus Hoer in the 70's at the National Bureau of Standard, Colorado.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"122 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":"116645833","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":"An Improlved Method For Slant Path Rain Attenuation Prediction","authors":"M. Pontes, L. da Silva Mello","doi":"10.1109/SBMO.1993.587210","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587210","url":null,"abstract":"This paper presents a rain attenuation prediction method that uses the complete point rainfall rate cumulative probability distribution as !input data to calculate the attenuation distribution, in an equi-probability basis. The motivation foir this effort was the recognition that the most commonly used prediction method, the one currently recommended by the CCIR, was developed with basis on a limited amount of data measured in temperate climates and offers poor results when applied to sites in tropical and equatorial regions. It was found that some improvement can also be obtained for temperate climates, taking advantage of the larger set of experimental results now available in the CCIR data bank.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"24 1 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":"133570529","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 motion compensation for synthetic aperture radar","authors":"J. Moreira","doi":"10.1109/SBMO.1993.589547","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589547","url":null,"abstract":"Presented is a real time solution to link the Pulse Repetition Frequency (PRF) of a Synthetic Aperture Radar (SAR) to the aircraft forward velocity without using an Inertial Navigation System (INS). The aircraft forward velocity is extracted using the Reflectivity Displacement Method (RDM). The control system used for coupling the RDM with the variable PRF unit is a non-linearand adaptive one, and based on an ideal on-off relay.","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":"132530341","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 General Quadrature Formula For Efficient Evaluation Of Radiation Integrals","authors":"F. Moreira, A. Prata","doi":"10.1109/SBMO.1993.587205","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587205","url":null,"abstract":"An efficient and general numerical procedure for evaluating the Physical Optics integrals occurring in the analysis and design of reflector antennas is presented. ‘The procedure combines Ludwig’s integration technique (i.e., independent interpolation of the integrand amplitude and phase) with a predictorcorrector scheme. This combination eliminates the amplitude and phase ambiguities present in the real+imaginary algebra used in machine calculations. The performance of the procledure is investigated on a typical case study: the evaluation of the field scattered by an offset paraboloidal reflector.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"2013 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":"133513152","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":"Analysis Of A Planar M-way Radial Waveguidie Combiner/ Divider For The Case Of Arbitrary Excitation","authors":"M. Bialkowski","doi":"10.1109/SBMO.1993.589539","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589539","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"2013 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":"132016420","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":"Biomedical Applications Of Optics. New Computer Aided Sensor Concepts For Nonimvasive Measurements Of Human Hemodynamics","authors":"V. Blazek","doi":"10.1109/SBMO.1993.589364","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589364","url":null,"abstract":"The majority of practical applications of microwave energy in medicine is based on the transformation of this energy into heat. AS useful as this may be in certain medical applications (e.g. microwave hyperthermia for oncological therapy), this is an unwanted effect in the study of blood volume kinetics in the skin, as these measurements must be performed in a thermoregulated steady state. As the penetration depth and focussing of radiation is a func-","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"8 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":"132937469","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":"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":"A Triple Deck Ceramic Sringle Chip Package For High Frequency Communication Integrated Circuits","authors":"M. Bedouani","doi":"10.1109/SBMO.1993.587230","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587230","url":null,"abstract":"High Frequency communication integrated circuits require specific packages with controlled impedance and very low attenuation. These IC’s use ECL like differential output gate structures. In this paper, we present full electrical design and experimental characterization of a high performance triple deck ceramic package based on shielded differential coplanar striplines used for (2-4 Gbitds) serial link circuits. Introduction Very high speed communication integrated circuits require specific packages with controlled impedance transmission lines and very low attenuation. High speed IC ‘s use differential gate structures: ECL Emitter Coupled Logic) and SCFL ( Source Coupled Eet Logic) respectively for silicon and GaAs technologies. We use a differential coplanar lines structure for high frequency packaging to avoid commutation noises and skew between the two output gate arms. On other hand, in order to have several isolated serial links in the: same edge of the chip, this structure is taken shielded. In cofired ceramic package techniques, conductors are made with tungsten paste (it’s resistivity is 14 times the copper resistivity). So, to reduce and control the conductor losses induced by the skin effects for high frequency applications, we use a shielded differential coplanar striplines [I] in 4.5 mm2 triple deck package (Figures 13). The minimum transmission line widht is 100 pm. Tapered lines are used to avoid impedance discontinuity ( the input and output pitches are respectively 300 pm and 1905 pm). The target characteristic impedances are SO Q and 100 Q respectively in single and differential modes. An analytical calculation method based on only simple transmission lines models is used for the electrical design of this structure. This analytical method is corraleted t o full 3D modelisation [ 21 and experimental characterization. Modelisation The scheme and the equivalent circuit model of the used shielded coplanar differential striplines are presented respectively in Figures 4 and 5. The L,Co,Cc and M parameters are determined by using a simple coupled lines models. The impedance of this structure is given by an analytical calculation : Zc=[ (L+M)/(CO+~C,)]~/~ and Zd=[ (L-M)/(C0+3Cc)] respectively in single and differential modes. L is the self inductance, CO is the plan capacitance, C, is the coupling capacitance and M is the mutual inductance. Comparison betweein analytical and 3D modelisation results are reported in Table 6. These results are very close within less than 5%. The influence of the ground transmission lines increases when the spacement between signal","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":"116617242","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":"Resonant Frequency Of A Microstrip Patch On A Magnetized Ferrite Substrate","authors":"E.J.A. Dantas, A. D’assunção","doi":"10.1109/SBMO.1993.589557","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589557","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"75 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":"115337102","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}