A DEVICE FOR MEASURING THE DIELECTRIC PROPERTIES OF POWDER MATERIALS BASED ON A STRIPLINE TRANSMISSION

Abstract

Measurement of electrodynamic parameters, such as dielectric and magnetic permeability in a wide frequency range for complex composite materials, remains an urgent task today. Despite the fact that measurement methods are known in the form of plates, parallelepipeds or cylinders, the measurement of properties in a wide range of frequencies of composite materials remains a poorly studied topic. Purpose of the study: substantiation of the possibilities of using a strip-slot transition for measuring the electro¬dynamic parameters of complex composite materials. Materials and methods. The article presents the results of studies of the electrodynamic parameters of composite materials based on a meter in the form of a volume strip-slot transition. This transition allows you to measure electrodynamic parameters in the frequency range from 10 MHz to 1400 MHz. The advantage of using a strip-slot transition is that when measuring electrodynamic parameters, there is no need to give a special shape (parallelepiped, cylinder) to the samples under study. This leads to additional technological difficulties and time-consuming preparation of the studied samples of the composite material. The investigated samples of the composite material can be in the form of a loose mixture. Due to this, bulk material completely occupies the internal space of the strip-slot transition. The investigated composite material is used in the design of building materials to ensure electromagnetic compatibility and is a loose mixture. Results. The article presents the frequency depen-dences of the reflection and transmission coefficients in the frequency range at different concentrations of materials in the final mixture. Conclusion. The technology for obtaining composite materials is described, taking into account the concentration of components in the mixture. Composite materials are a hybrid material – a dry mixture of electromagnetic (graphite) and dielectric particles (perlite), as well as a cement-polymer binder, intended for applying a radio-absorbing coating on building envelopes. The disperse compositions of perlite and graphite particles are close and are in the range of 0.1…1 mm. Samples of the mixture differ in composition by the SiO2/C volume ratio.