Abstract
MIMO antennas are widely used in wireless communications because of their spectral efficiency for the total transmitted power. In this paper, a single antenna is used to design MIMO antenna array made of four identical planner bowtie antennas with reduced mutual coupling. Each antenna element in the array has 2 U shaped metal strips with fixed sizes and 4 rectangular metal strips with a fixed vertical dimensions and variable horizontal width. The resultant MIMO antenna can operate at 9.25 and 10.5 GHz frequency bands. The four antenna array elements are separated by two slot lines to reduce the mutual coupling among antennas. The performance for the proposed single and MIMO bowtie antennas is simulated using HFSS to obtain the return losses, impedances, radiation patterns, radiation efficiencies and current distributions. The results show that the loaded MIMO antennas have a very low mutual coupling without additional parasitic or reactive elements.
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