Antenna systems based on chiral metamaterials with fractal radiator geometry for radio communication systems

Background. In wireless mobile communications, there are often situations when several radio transmitting devices operate on a single antenna system in several frequency bands, and therefore there is a need to create efficient multi-frequency antenna systems operating in two or more frequency bands. One of the approaches to creating such multi-frequency antenna systems is the use of fractal radiators of various spatial geometries. In addition, the use of chiral metamaterials in the designs of such antennas makes it possible to increase the spectral efficiency of the entire system. Aim. Investigation of the possibilities of increasing the spectral efficiency of modern radio communication systems using MIMO technology by using antenna systems based on chiral metamaterials with fractal emitter geometry. Methods. For calculating the characteristics of antenna systems with fractal emitter geometry, electrodynamic modeling methods and software complexes based on them are used. Results. The characteristics of antenna systems with fractal emitter geometry are calculated. It is shown that such antennas have multi-frequency properties. Frequency dependences of spectral efficiency are determined when using two-element antennas with different fractal radiators. It has been established that in most cases there is an increase in spectral efficiency. Conclusion. The radiating structures under consideration can be used as the basis for creating antenna systems for modern radio communication systems using MIMO technology. However, it should be noted that some technical solutions of radiating structures are unlikely to find application in broadband radio communication systems, since they have relatively small operating frequency bands.