Application of receiving circular antenna arrays for the field HF-band Radio systems based on MIMO technology

This work presents the main features of HF-band radio systems. Here generally MIMO technology is used for radio channel bandwidth enhancing. We propose to apply hybrid both spatial and polarization sub-channel spacing. The last one is realized by using three-orthogonal antenna elements forming a circular antenna array. We produced synthesis of eight-element circular antenna array and analyzed resulting model to define its electrodynamics properties. Results of numerical analysis are represented in the form of radiation patterns competed for vertical and horizontal sections over three HF-band frequencies. We produced analysis of capacity limits for MIMO 6x6 channel formed by proposed circular antenna array. According to obtained results, solutions based on circular antenna array provide channel bandwidth enhancing due to higher spatial selectivity and thereby improved signal-to-noise ratio.