Application of EBG and DGS structure on antenna array

Electromagnetic Band-Gap (EBG) Structures are periodic structures with an obvious frequency band gap, which can suppress the propagation of surface-wave; these structures can help to reduce the mutual coupling of antenna array. As a result, they can be used to optimize the performance of antenna array. At the same time, the Defected Ground Structure (DGS), which is developed on the basis of the EBG structure, is simpler than EBG structure and also has the ability to decrease the mutual coupling of antenna array. In this paper, the reflected phase method and suspended microstrip line method are used to respectively measure the stop band of EBG structures and a DGS. Then, two designed EBG structure and DGS are applied to antenna arrays with the help of the professional software HFSS. The results confirm the fact that these two structures can suspend the mutual coupling effectively, as well as optimize the radiation patterns.