A novel wideband electromagnetic band gap structure for circular polarization conversion

In this paper a new polarization dependent electromagnetic band gap (PDEBG) structure is introduced. The structure is made up of numerous periodic cells, where each constituent cell consists of a square patch surrounded by a square metal loop. The patch and the loop are connected in one of their corner, and a via is placed on the diameter of the square patch near the connection. The designed structure is simulated and the results show that the structure has axial ratio less than 3 dB in the frequency bandwidth from 9.94 GHz to 11.98GHz, and from 13.53 GHz to 16.57 GHz. the proposed PDEBG structure has a wider frequency band width for linear to circular polarization conversion than previously introduced PDEBG structures.