New concentric circular design of ESPAR antenna for DoAs estimation of highly correlated signals

In this paper, a new design of Electronically Steerable Parasitic Array Radiator (ESPAR) antennas is proposed for directions of arrival (DoAs) estimation of coherent sources by the well known ESPRIT algorithm. The Spatial Smoothing technique (SS) is adapted to this antennas shape to remove signals´ coherence. The excellent performances of the uniform circular geometry are used to ensure accurate DoAs estimation in all the azimuth coverage. Simulation results show that the use of the spatial smoothing technique with the proposed ESPAR antenna shape improves DoAs estimation accuracy compared to the original ESPRIT algorithm for ESPAR antennas especially in highly correlated sources situations and prove the validity of our approach.