Compact printed dual-band monopole array with high port isolation

In this paper, a compact defected ground structure (DGS) with two circular split ring slots is presented to increase the port isolation of a compact dual-band antenna array. The proposed dual-band DGS is etched on the ground plane between two antenna elements. Each split ring slot corresponds to one resonant frequency of the antenna. The simulated results show that by using the proposed DGS structure the port isolation of the compact array can be obviously increased and the array is suitable for applications in multiple antenna communications.