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espanolEste articulo presenta una implementacion del metodo de linea de transmision/reflexion para determinar las propiedades electromagneticas intrinsecas de materiales desconocidos con permeabilidad magnetica relativa distinto de uno. Con un analizador vectorial de redes (AVR), los coeficientes de dispersion de la energia transmitida y reflejada se miden simultaneamente para extraer la permitividad electrica relativa y la permeabilidad magnetica relativa. La tecnica de extraccion clasica de Nicolson-Ross-Weir en el dominio de la frecuencia es explicada extensamente y presentada tal que las ecuaciones pueden ser facilmente implementadas mediante el Software libre GNU OCTAVE. El desfasaje en los planos de referencia y las mediciones de calibracion del conector, son realizadas por un AVR de bajo costo sin la funcion de incorporacion. Una linea de transmision coaxil con conectores N hembra es usada por su bajo costo, con el porta muestras de facil construccion. El procedimiento de medicion es valido desde 2 MHz a 6 GHz, mientras que los resultados preliminares se muestran en el rango de 1 a 6 GHz. El articulo tambien comenta acerca de la preparacion de la muestra, especialmente el espesor del material. EnglishThis article presents an implementation of the transmission/reflection line method to determine the intrinsic electromagnetic properties of unknown materials with relative magentic permeability not equal to one. With a vector network analyser (VNA) the forwardand back-scattered energy are measured to simultaneously extract the electric permittivity and magenetic permeability. The classic Nicolson-Ross-Weir extraction technique in frequency domain is explained in detail and presented such that the equations can be easily implemented by open-source post-processing with GNU Octave. The shift in phase reference planes and connector calibration measurements are performed such that a very low-cost VNA without de-embedding function can be used. A coaxial transmission line with N type female connectors is used providing a low-cost, easy to manufacture solution of a sample holder. The measurement procedure is valid from 2 MHz to 6 GHz, whereas the preliminary results are shown in the GHz range from 1 to 6 GHz. The article also comments on the sample preparation especially the thickness of the material slab.

Design and Evaluation of a Measurement Procedure to obtain the Electric Permittivity and the Magnetic Permeability