Electronic magnetic waves affect both people and equipment negatively. This is why the creation of new, special materials for radio electronics has become relevant recently. “Creation of a New Functional Material” is the project which won the contest “Beginning of Big Science 2017”. The project’s creator is Denis Klygach, Candidate of Sciences (Engineering), Associate Professor of the Department of Design and Production of Radio Apparatus of the SUSU School of Electrical Engineering and Computer Science.
“This research exists at the junction of two sciences: materials sciences and electrodynamics. In our university, we are creating new materials based on hexaferrite. We have analyzed their chemical and physical properties in terms of mechanics. Ferrites like hexaferrite barium are used in radioelectronics. For example, they are used in microwaves and in antennas,” notes Denis Sergeevich.“Right now, research on the electromagnetic properties of these materials is a hot topic, and that’s what our team is working on. We have developed a method of measuring electrodynamic parameters such as electrical permeability and the tangent angle of dielectric loss. The use of these methods on several materials showed that the obtained parameters match those found in other research studies. This allows us to work on the creation of unique materials like hexaferrite barium with additional titanium, magnesium, and other elements.”
The basis of the proposed method is the use of powder in coaxial transmission lines. This method does not involve pressing the material or giving it a particular shape. Since powder has the same physical and chemical properties as the sintered materials, it takes up all of the open space in the coaxial line. It becomes possible to connect to the measuring line and measure the material in a wide range of frequencies. Using this method, the existing materials were measured, and research is being done on the parameters of other materials.
One of the possibilities of the use of this material is absorbing electromagnetic waves from cell phones. In addition, it is used in civil aviation and anechoic chambers to minimize the cross-talk of radioelectric equipment. The ability to absorb radio waves also makes it possible to use the material to ensure the safety of a room.
“Our goal is to create material with the necessary characteristics which can also be used in creating various microwave devices like microwave loader, phase switchers, and microwave filters,” stresses Denis Sergeevich. “For example, a load is a piece of equipment for calibrating measurement devices for work with other microwave devices. It is connected to the output cable, i.e. it has a firmly fixed resistance. The developed material makes it possible to weaken the amplitude of the electromagnetic waves when passing through in the range from 2 to 18 GHz.”
The results of the measurements showed that the material weakens the amplitude of electromagnetic waves in a wide range of frequencies. At present, the researcher has published 3 scientific articles indexed in the Scopus database: Journal of Materials Science: Materials in Electronics, materials in the conference Proceedings of the 2017 19th International Conference on Electromagnetics in Advanced, and 10th European Conference on Antennas and Propagation, EuCAP 2016.
The next stage will be creating a model of microwave load. These developments can be used in producing electronic devices. In relation to this, the scientific project is already of interest to businesses which specialize in this field.