EXPERIMENTAL INVESTIGATIONS OF THE INFLUENCE OF HUMIDITY OF WALL CONSTRUCTION MATERIALS ON THE PERFORMANCE OF RADIO WAVES OF A RANDOM LINE
Anatoliy Satukov, Anatoliy Prystupa, Vladimir Zhurko, Mstislav Bivalkevich · TECHNICAL SCIENCES AND TECHNOLOGIES · 2018
Urgency of the research. Modern information technology is using ultrahigh frequencies to a large extent. The reliability of such systems in some cases is associated with the passage of microwave signals through the construction materials. At the same time there is a relaxation of the radio signal, the degree of which largely depends on the level of moisture content. Therefore, the study of patterns associated with the passage of microwave radio waves through wet materials is very important and topical task. Target setting. The conditions for the propagation of radio waves affect the task that needs to be addressed when designing, manufacturing and deploying elements of electronic systems of radio channels. Taking into account the relaxation of signals by interference, it is possible to optimally select the working frequencies, the power of generator elements, parameters of antenna systems and their location. In turn, reliability of work, impedance protection, competitive ability, cost-effectiveness of manufacturing and operation depend on this. Actual scientific researches and issues analysis. The question of the propagation of radio waves in the air and above the earth's surface has been studied very carefully and completely. The frequencies detected are the least observed, as well as the most damping of radio waves. This made it possible to create reliable and optimally structured communication channels. In recent years, radio communication systems operating in the proliferation of radio waves in the presence of various obstacles are increasingly developing. For example, mobile communications or wireless internet, which work in indoors and buildings. For them, numerous devices, antenna systems, various IT technologies have been created. Uninvestigated parts of general matters defining. Radio channel parameters such as transmitter power, antenna design and placement are closely related to the proliferation of radio waves due to various obstacles. Such obstacles, in particular, may be various building constructions – walls, floors, etc. They weaken the power of radio waves passing through them everywhere. The degree of such relaxation may significantly depend on the level of moisture content of the barrier. The data presented in various literary sources do not, for the most part, take into account this aspect. The research objective. Influence of moisture of wall building materials on the level of weakening of microwave signals and determination of frequencies with a minimum level of such relaxation. The statement of basic materials. The authors carried out measurements of the degree of weakening of microwave radio waves by the main wall building materials - samples of red and silica brick, concrete and foam concrete. Measurements were made when changing the level of moisture content. The obtained results were compared with the passage of radio waves everywhere with a dry specimen. This made it possible to determine exactly the effect of the change in humidity on the relaxation of the radio signal. Measurements were carried out in the frequency range of 2–8 GHz. and humidity of samples of wall materials up to 10 %. In addition, an analysis of the change in the signal attenuation from the degree of humidity at individual frequencies is carried out. Also, comparing the relaxation of radio waves with different materials with the same level of humidity is made. Conclusions For the main wall building materials – concrete, brick red and silicate, foam concrete specific experimental dependence of the weakening of the microwave signal from moisture in the frequency band 2–8 GHz is determined. frequency bands with the smallest and largest relief of the microwave signal.