## 5 Discussion  
The existing methods for measuring the electrophysical parameters of plane samples of materials are quite diverse. However, the carried-out studies have proved that the proposed method is able to accurately and quickly measure the dielectric permittivity and magnetic permeability. In this case, the error in the values of the real part of the dielectric permittivity was no more than 2%. This does not exceed the percentage of error for known methods described in the literature.  
In comparison with existing ready-made installations (a line of devices SPEAG Dielectric Assessment Kit (DAK), Keysight Technologies, and others) are based on the existing methods of Nicholson-Ross-Veer, NIST Precision, etc. (these methods are also based on measuring the reflected and transmitted signal) for studying the electrophysical properties of materials, the proposed installation also has advantages. As their analysis showed, these installations are even more demanding in terms of the size, thickness, and surface of materials. They also generally measure only plane and smooth samples. Using a wider bandwidth means more expensive equipment. The use of a vector reflectometer, as in the proposed installation, greatly reduces the cost of the installation and simplifies measurements. In addition, the proposed setup uses a metal parabolic reflectometer, which significantly reduces frequency dispersion. The developed method makes it possible to measure contactless not only smooth, but also rough materials in the region of the beam focusing zone in a smaller frequency range. Experiments carried out on the created laboratory model have shown this possibility.  
In the article [28], using the SPEAG DAK TL-P device, the real part of the dielectric permittivity of plexiglass was measured. The data obtained in the frequency range 5-20 GHz correspond to the data obtained using the installation presented in the article and the developed method.  
This method allows you to measure materials with dielectric values in the range from \(\varepsilon\) = 1.03 to \(\varepsilon\) = 25. The upper threshold is limited by the sensitivity of the Vector reflectometer CABAN R 140 (115 dB), the lower one--to a lesser extent by the quality of the surface of the measured material and to a greater extent by the homogeneity of the focusing beam (along the vertical). This is the last thing  
Figure 14: Electrical conductivity values for composite material measured by laboratory model (red) and proprietary Agilent equipment (blue) dependence frequency.  
Figure 15: The values of the real and imaginary parts of the dielectric permittivity dependence frequency for a non-plane material.  
that does not allow us to improve the quality. This is about the error. In terms of frequency, the lower threshold is limited by the size of the mirror according to the formula \(\lambda=\frac{g}{5}\), where \(a\) is the antenna aperture, the upper one, by the accuracy of the mirror itself and by \"walking\" the phase center of the antenna in the feed, that is, by the characteristics of the antenna itself. We now have it up to 13 GHz. Another important factor is the stability of the antenna pattern. Thus, 13 GHz is the limit. To go higher, you need to make a new antenna, for example, from 10 to 40 GHz.  
In future, we plan to modernize the installation so as to improve quality. We also plan to introduce additional mathematical data processing to reduce the measurement error. We consider it necessary to expand the range of immersed materials and investigate the applicability of the developed method to such types of modern and popular materials as polymer composite materials.  
Such polymeric materials should have biocompatibility, predictable resorption, and the absence of toxicity of both the materials themselves and their degradation products.