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This document presents the investigation of circular polarization quality by using a dual polarized broadband antenna and a hybrid coupler. The hybrid coupler shifts phase of signals between outgoing ports. By means of the phase shifted signals incoming into dual polarized antenna the circular polarization is achieved. The influence of polarization quality on the components parameters is discussed and the analysis and measurement are presented as well. The aim of this paper is to introduce the reached results of the simulated circular polarisation quality in comparison with measured parameters.