Mutual coupling reduction between two microstrip patch antennas by using the parasitic elements

In this paper, the reduction of mutual coupling between two microstrip patch antennas is presented by implementing a novel parasitic structure. The measured results show that a 21 dB mutual coupling reduction was obtained in the bandwidth of 2.2% without affecting the radiation patterns obviously. This structure can be easily integrated into an adaptive antenna array to improve the null depth, or into a MIMO system to achieve a good isolation between antenna elements with the additional efforts on the mutual coupling reduction in E-plane.