SBMO International Microwave Conference/Brazil,最新文献

{"title":"Experimental Study Of Ohmic Effects In Open Coaxial Cavities","authors":"P. J. Castro, Joaquim J. Barroso, R. A. Corrêa, I. P. Spassovsky","doi":"10.1109/SBMO.1993.587248","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587248","url":null,"abstract":"A study of selective properties of coaxial open cylindrical resonators has been conducted experimentally and compared with theory. Mode discrimination is achieved both by exploring selective ohmic effects and examining the electrodynamic properties of the coaxial cylindrical waveguide. The effectiveness of a lossy silicon carbide coaxial insert in providing effective radial mode selection is demonstrated in that the total Q factors of TE,, modes with radial index p 2 2 become well below the quality factors for surface TE,1 modes.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"31 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":"116130483","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":"Design And Breadboarding Of Wideband Nxn Butler Matrices For Multiport Amplifiers","authors":"B. Piovano, L. Accatino, A. Angelucci, T. Jones, P. Capece, M. Votta","doi":"10.1109/SBMO.1993.589533","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589533","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"11 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":"116244377","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 Use Of The Finite-Difference Method For The Analysis Of The Coupling Between Anisotropic Dielectric Waveguides","authors":"C.L. da Silva Souza Sobrinho, A. Giarola","doi":"10.1109/SBMO.1993.587214","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587214","url":null,"abstract":"The finite-difference method is used in the analysis of the propagation characteristics of coupled anisotropic dielectric waveguides. The theoretical development is based on the numerical solution of the wave equation, written in terms of the transverse components of the magnetiic field. As a result a conventional eigenvalue problem is obtained without the presence of spurious modes due to the implicit inclusion of the divergence of the magnetic field equal to zero. The general case of a biaxial anisotropic dielectric is considered, including a refractive index profile varying arbitrarily in the waveguide cross section.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"118 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":"128146562","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":"Reflection Properties Of Isotropic-Pseudochiral Interfaces","authors":"A. Toscano, M. Vaccari, L. Vegni","doi":"10.1109/SBMO.1993.587218","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587218","url":null,"abstract":"In this paper we consider the trainsmission and reflection properties of a planar isotropic-pseudochiral interface under excitation condition of planar waves. The development of the solution is obtained by using the conventional boundary conditions in the transverse plane of the structure with respect to the normal axis of the interface plane. Several interesting characteristics of the reflected and transmitted plane waves have been obtained depending on the constitutive parameters and the pseudochirality admittance. Introduction and statement of the! electromagnetic problem The study of electromagnetic field propagating in complex (artificial) media, such as biisotropic chiral, anisotropic uniaxial, biaxial and gyrotropic ones, is a stimulating research topic for itis potential applications, namely in optics and millimeter wave frequency range. This is reflected in an increasing demand of rigorous theoretical models and efficient numerical tools, working at higher and higher frequencies for practical structures, as the planar integrated configuration with a dielectric slab, generally terminated on a ground plane or on an other unbounded medium. Therefore a first interesting problem is connected with the absorbing or reflecting properties of planar interfaces. Recently [l], a new type of synthetic material, called R (or pseudochiral) medium has been brought to the attention of the applied research. R medium is realized on a host isotropic material, where planar conducting microstructures, shaped as the Greek letter Q and with their stems oriented along the same axis, are embedded (Fig.1). K s Fig.1 Planar conducting microstructures of a medium. A magneto-electric coupling effect, due to the shape of the microstructures, is characteristic of such a mediurn and can be described by the appropriate 2-constitutive relations: D=E.E +goH and B=3;*E + 11.H; where E = + p y y ~ c ~ ~ , = & are (3x3) diagonal biaxial tensors, while z and have the expressions: z =-jp,,R,y^x ̂ P = jpyyRcxy. Rc is the pseudochiral admittance. Therefore besides the classical Eii, Pjj parameters the pseudochiral medium has an additional degree of freedom, given by a,. A h","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"60 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":"130002887","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":"Radar-ECM Simulation System","authors":"C. Oliveira, M. Grivet, F. Pantoja","doi":"10.1109/SBMO.1993.589545","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589545","url":null,"abstract":"This paper presents a simulation system that deals with the analysis, monitoring, and evaluation of signals in the interaction of Radar and Electronic Counter Measure Systems (ECM). The computational system is modular and flexible and is aimed at the realistic description of the behavior of many modem radars, jamming and deception techniques. The final goal of the system is the graphical representation of the target range and velocity tracking features. Important and essential parameters for the evaluation of Radar Systems in the presence of ECM can therefore be characterized.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"32 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":"128099207","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":"Use Of Microwave In The Satellite Positioning","authors":"D. Blitzkow, R. Schaal","doi":"10.1109/SBMO.1993.589541","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589541","url":null,"abstract":"Since the launching of the first satellite, Sputnik I, it has been realized that a signal of microwave could be used for positioning, The first idea was to position the satellite. Immediately after the same idea has been throught to position an observer. As a consequence of that, a navigation system has been developed for the use of the U.S. Navy which is known by TRANSIT or NNSS (Navy Navigation Satellite System). The original system has been improved in order to provide sufficient accuracy for geodetic positioning. Several restrictions of this satellite system emphasized the necessity to develop a new idea for positioning and it came to the light what it is known by Global Positioning System (GPS). 1. Historical Introduction Radio portion of the electromagnetic spectrum found early use in satellite navigation. When the first artificial earth satellite has been launched by USSR in October 4, 1957, two Americans, W. H. Guier and G. C. Weiffenbach, realized that a microwave signal could be used to position the satellite. Originally, the main concern was with the space vehicle. Immediately after McClure suggested to use the same principle to position the observer, more precisely, the electric center of a receiver antenna. In this case the position of the satellite must be known. As a consequence John Hopkins University Applied Physics Laboratory developed a system for positioning using satellites that has been implemented by US Navy and it is known as TRANSIT or Navy Navigation Satellite System (NNSS).","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"36 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":"126908259","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":"Optoelectronic Technology For Computer Intemonnects","authors":"D. Channin","doi":"10.1109/SBMO.1993.589384","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589384","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"66 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114060567","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 Stability Of The Double Dielectric Resonator On A Dielectric Substrate","authors":"R. Herrera, K. Derzakowski","doi":"10.1109/SBMO.1993.587250","DOIUrl":"https://doi.org/10.1109/SBMO.1993.587250","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"17 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":"114352403","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":"Wide Band, Wide Temperature Operating Range Acousto-optical Spectrometer (A.O.S) For The Balloon Borne Pronaos Submillimetre Heterodyne Experiment.","authors":"C. Rosolen, D. Michet, C. Gac, A. Lecacheux","doi":"10.1109/SBMO.1993.589551","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589551","url":null,"abstract":"In order to fulfill the scientific objectives of the Pronaos balloon borne SubMill imetre heterodyne experiment, we developed a wide band A.O.S. (bandwidth > 700 MHz) having very good stability over a large operating temperature range (loo to 40\"). The optimization of the frequency resolution of the spectrometer (B*T > 1000) was obtained in designing and building, in collaboration with Thomson-Sin tra, a new kind of Bragg cell in L i m o 3 (Y+123\" orientation) centered at 2 GHz. We described the new solutions that we have implemented for minimizing the size, weight and power of the device and for improving its reliability. All these improvements lead to a very simple and reliable device as well adapted for space experiments as for low cost, ground based applications.","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"487 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":"122749543","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 Experience Of Teaching Microwaves & Antennas In Novosibirsk Telecommunication Institute","authors":"B. Kapilevich","doi":"10.1109/SBMO.1993.589373","DOIUrl":"https://doi.org/10.1109/SBMO.1993.589373","url":null,"abstract":"","PeriodicalId":219944,"journal":{"name":"SBMO International Microwave Conference/Brazil,","volume":"65 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":"125953330","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}