{"id":97128,"date":"2009-10-11T00:00:00","date_gmt":"2009-10-11T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/contribucion-a-la-transformacion-en-sistemas-cila%c2%adndricos-de-campo-proximo-a-campo-lejano-analisis-de-errores-mecanicos-y-electricos-y-reconstruccion-de-campo\/"},"modified":"2009-10-11T00:00:00","modified_gmt":"2009-10-11T00:00:00","slug":"contribucion-a-la-transformacion-en-sistemas-cila%c2%adndricos-de-campo-proximo-a-campo-lejano-analisis-de-errores-mecanicos-y-electricos-y-reconstruccion-de-campo","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/antenas\/contribucion-a-la-transformacion-en-sistemas-cila%c2%adndricos-de-campo-proximo-a-campo-lejano-analisis-de-errores-mecanicos-y-electricos-y-reconstruccion-de-campo\/","title":{"rendered":"Contribuci\u00f3n a la transformaci\u00f3n en sistemas cil\u00edndricos de campo proximo a campo lejano. an\u00e1lisis de errores mec\u00e1nicos y el\u00e9ctricos y reconstrucci\u00f3n de campo"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Alcino Castelo  Boso <\/strong><\/h2>\n<p>Desde hace mucho tiempo hay inter\u00e9s en desarrollar una formulaci\u00f3n matem\u00e1tica que permita transformar las propiedades de radiaci\u00f3n de una energ\u00eda por una antena o un array de antenas desde la zona m\u00e1s pr\u00f3xima a las mismas a zonas lejanas. Este inter\u00e9s se ha debido a la necesidad de realizar medidas muy precisas para desarrollar antenas de altas prestaciones, a la mejora de los m\u00e9todos de an\u00e1lisis de las mismas y a la imposibilidad de medir antenas de gran tama\u00f1o el\u00e9ctrico directamente en campo lejano.   el problema de la radiaci\u00f3n consiste de forma gen\u00e9rica en encontrar los campos electromagn\u00e9ticos exteriores a unas fuentes que se encuentran contenidas en una cierta regi\u00f3n del espacio. El empleo de la formulaci\u00f3n modal permite expresar los campos radiados como la superposici\u00f3n de ondas elementales planas, cil\u00edndricas o esf\u00e9ricas. En particular, en esta tesis se desarrolla el problema con geometr\u00eda cil\u00edndrica. De este modo el problema de la radiaci\u00f3n se reduce a obtener las amplitudes complejas de cada una de las ondas elementales que por superposici\u00f3n dan lugar a los campos radiados. El empleo de expansiones modales tiene como contrapartida que su aplicaci\u00f3n est\u00e9 limitada a casos que contengan formas geom\u00e9tricas can\u00f3nicas, no obstante su aplicaci\u00f3n soluciona cualquier problema electromagn\u00e9tico. Estas amplitudes complejas o coeficientes modales describen completamente los campos, con la ventaja de que permite un conjunto de valores escalares y es posible obtener los campos radiados en cualquier punto del espacio. La dependencia espacial de los campos viene dada por las funciones de onda, que son las soluciones de la ecuaci\u00f3n de onda por separaci\u00f3n de variables en el sistema. Las propiedades de las funciones de onda permiten que la formulaci\u00f3n espectral est\u00e9 especialmente bien adaptada al tratamiento de problemas electromagn\u00e9ticos en que est\u00e9n involucradas superficies que se definen por una o varias coordenadas constantes en el sistema de coordenadas empleado. La influencia de los errores de medida sobre el diagrama de radiaci\u00f3n es importante al medir antenas con especificaciones muy estrictas en cuanto posicionado del haz principal y nivel de l\u00f3bulos secundarios. Es importante el estudio de errores de medida en campo pr\u00f3ximo en coordenadas cil\u00edndricas para sistematizar en lo posible la especificaci\u00f3n de un campo de medida, proporcionando expresiones que relacionen el error en campo pr\u00f3ximo y su efecto sobre el campo lejano.  \t\tel primer cap\u00edtulo hace una descripci\u00f3n resumida de los fundamentos te\u00f3ricos de radiaci\u00f3n de las antenas; se explican las formulaciones matem\u00e1ticas de la teor\u00eda electromagn\u00e9tica de campos, se describen resumidamente las magnitudes f\u00edsicas de campos vectoriales, y se describen las ecuaciones de maxwell que explican los fen\u00f3menos electromagn\u00e9ticos, permitiendo predecir los campos electromagn\u00e9ticos generados en cualquier punto del entorno, adem\u00e1s de relacionar los campos el\u00e9ctricos y magn\u00e9ticos con las cargas y corrientes que los crean. \t\t \tel segundo cap\u00edtulo describe y explica la superficie cil\u00edndrica de medida utilizada para transformar el campo pr\u00f3ximo calculado sobre la misma, al campo lejano. Se describe el m\u00e9todo para llevar a cabo la transformaci\u00f3n del campo pr\u00f3ximo al campo lejano, con base en la teor\u00eda de la ecuaci\u00f3n de onda en coordenadas cil\u00edndricas y en descomposici\u00f3n de modos del campo a partir de la aplicaci\u00f3n del teorema de reciprocidad de lorentz. Se aplica el m\u00e9todo de correcci\u00f3n de antena sonda para evitar que el efecto de radiaci\u00f3n de la misma afecta a la radiaci\u00f3n de la antena bajo prueba, distorsionando as\u00ed el campo resultante a obtener.\t \t\t \ten los cap\u00edtulos tercer y cuarto, se explican y se simulan los errores mec\u00e1nicos y el\u00e9ctricos. Se mencionan algunas t\u00e9cnicas de automatizaci\u00f3n para evitar errores mec\u00e1nicos de posicionamiento o el\u00e9ctricos; en el an\u00e1lisis de errores el\u00e9ctricos, hemos generalizado en esta tesis los errores debidos a posibles fallos en la alimentaci\u00f3n de las antenas, o fallos por posicionamiento, que hemos demostrado mediante simulaciones haciendo comparaciones entre los diagramas de radiaci\u00f3n, estableciendo as\u00ed diagramas de referencia de un funcionamiento correcto. \t\t \ten el quinto cap\u00edtulo, con base en el vector tridimensional de la expansi\u00f3n de onda cil\u00edndrica de un campo electromagn\u00e9tico, y de las caracter\u00edsticas ortogonales de los modos y de los coeficientes de la extensi\u00f3n modal obtenidas, se reconstruye el campo pr\u00f3ximo. El m\u00e9todo de la distribuci\u00f3n del campo descrito en este cap\u00edtulo permite calcular el campo pr\u00f3ximo sobre un cilindro de cualquier medida. Adem\u00e1s se ha generalizado el m\u00e9todo que evita los errores de truncamiento, calculando el campo pr\u00f3ximo sobre una superficie cil\u00edndrica idealmente infinita a partir del campo medido sobre la superficie cil\u00edndrica con dimensi\u00f3n conocida.   abstract  long there is interest in developing a mathematical formulation that allows the properties of radiation energy by an antenna or an array of antennas from the area close to them to remote areas. This interest has resulted from demands of very precise measures to develop high performance antennas, improved methods for analyzing them and by the impossibility of measuring large antennas directly into electric far field. the problem of radiation consists of generic electromagnetic fields to find some external sources that are contained in a certain region of space. The use of the modal formulation allows expressing the radiated fields as the superposition of elementary plane waves, cylindrical or spherical. Thus the problem of radiation is reduced to obtain the complex amplitudes of each of the elementary waves that give rise to overlapping fields radiated.   employment expansions and manners come at which their application is limited to cases that contain canonical shapes, however its application to solve any electromagnetic problem. These complex amplitudes or modal coefficients completely describe the fields and with the advantage that allows a finite set of scalar values, it is possible to obtain the radiated fields at any point in space. The spatial dependence of the fields is given by wave functions which are solutions of the wave equation by separation of variables in the system. The properties of wave functions allow the spectral formulation is particularly well suited to the treatment of electromagnetic problems that are involved in areas that are defined by one or more constant coordinates in the coordinate system used.  \t \tthe influence of measurement errors on the radiation patterns is important when measuring antennas with very strict specifications on positioning the main beam and side lobes level. It is important to the study of measurement errors in near-field in cylindrical coordinates where possible to standardize the specification of a measurement range, providing expressions that relate the error in near-field and its effect on the far field.  the first chapter on the introduction makes a brief description of the theory of radiation from the antennas, is the mathematical formula of the theory of electromagnetic fields is described briefly, the physical quantities of vector fields, described by maxwell equations that explain electromagnetic phenomena, allowing to predict the electromagnetic fields generated anywhere in the environment, in addition to relating the electric and magnetic fields with the charges and currents that are created.  the second chapter investigates, describes and explains the cylindrical surface of measurement used to transform the near-field calculated on the same far-field. It investigates and describes the method to carry out the transformation of the near-field far-field, based on the theory of wave equation in cylindrical coordinates and decaying modes of the field after the application of reciprocity theorem lorentz. Under the method of correction of antenna probe to prevent the effect of radiation affects the radiation from the antenna under test, thereby distorting the resulting field to be obtained.   in the third and fourth chapters are explained and simulate electrical and mechanical errors. It mentions some automation techniques to avoid positioning errors mechanical or electrical failure in the electrical analysis of errors, we have generalized this idea due to possible errors in judgments of food dishes, or failures by positioning, we have shown through simulations making comparisons between the radiation patterns, thus, reference standards of proper operation.  in the fifth chapter, based on the three-dimensional vector cylindrical wave expansion of an electromagnetic field, and the characteristics of the orthogonal modes and the coefficients of the expansion modes, is rebuilt the next field. The method of the field distribution is described in this chapter allows to calculate the near field on a cylinder of any measure. It has also been widespread method that avoids the truncation errors by calculating the near field on an infinite cylindrical surface ideally from field measured on the cylindrical surface with a known dimension.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Contribuci\u00f3n a la transformaci\u00f3n en sistemas cil\u00edndricos de campo proximo a campo lejano. an\u00e1lisis de errores mec\u00e1nicos y el\u00e9ctricos y reconstrucci\u00f3n de campo<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Contribuci\u00f3n a la transformaci\u00f3n en sistemas cil\u00edndricos de campo proximo a campo lejano. an\u00e1lisis de errores mec\u00e1nicos y el\u00e9ctricos y reconstrucci\u00f3n de campo <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Alcino Castelo  Boso <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 10\/11\/2009<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Leandro De Haro Ariet<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jos\u00e9 Luis Besada sanmart\u00edn <\/li>\n<li>Luis enrique Garc\u00eda mu\u00f1oz (vocal)<\/li>\n<li>Antonio Garc\u00eda pino (vocal)<\/li>\n<li>Fernando Las heras andr\u00e9s (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Alcino Castelo Boso Desde hace mucho tiempo hay inter\u00e9s en desarrollar una formulaci\u00f3n matem\u00e1tica que permita transformar 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