Medidas de propiedades dieléctricas de materiales de construcción utilizando una guía rectangular

A set of measurements of electromagnetic properties of building materials is presented in this work. The method is based on an open-ended rectangular waveguide that radiates into the material under study. Measurements were done by using two waveguides with different size for obtaining the results in two ranges of frequencies. The values of the dielectric constant are deduced from the measured reflection coefficient or admittance of the waveguide radiating into the material. A relatively simple model can be used to deduce the values of the dielectric constant from the experimental data. This method can be used for other type of materials and its main advantage is the non-destructive character and the ease implementation

Medidas de propiedades dieléctricas de materiales de construcción mediante elipsometría

A set of measurements of electromagnetic properties of building materials is presented in this work. The method is based on the measurement of the polarization state of the reflected signal from the material under study at a fixed angle of incidence. From the measured data, by using the Fresnel equations, it has been obtained the dielectric constant. Measurements were done by using two horn antennas at the frequency of 9 GHz. The obtained results are compared with the free space reflexion and transmission Fresnel method and other reflection methods based on a conductor waveguide. The method explained in this work can be used for other type of materials and its main advantage is the non-destructive character and the ease implementation