The Impact of the Sizes of a Planar Sample to Methodical Errors in Measuring the Specular Reflection Coefficient

The purpose of this work is to determine the measurement errors of the absolute value of coefficient of specular reflection for the samples of magnetodielectric different geometric dimensions. These errors occur due to edge effects. Computations of the specular reflection coefficient for finite samples of materials were carried out by the rigorous method of moments in the FEKO software. These results were compared with calculations by Fresnel formulas for the infinite plane with material. Thus, the influence of the linear dimensions of the samples on the accuracy of measurement the scattering characteristics has been revealed. The results of the study showed that the width of the sample is a determining factor for the errors of measurement the specular reflection coefficient in the region of small angles of incidence. The sample length is a determining factor for the errors of measurement the specular reflection coefficient in the region of large angles of incidence. The strongest influence of diffraction on the sample edge is observed in the region of thickness resonance.