Abstract
In this survey paper, we discuss various techniques that can be employed to enhance isolation between multiple-input and multiple-output (MIMO) antennas. In this modern world, the MIMO antenna system is an important technique used in wireless technology. The channel capacity in a multipath environment can be improved by deploying multiple antenna elements, i.e., the MIMO technique at both the transmitter and receiver terminals. To have an efficient MIMO technique, the isolation between the multiple antenna elements must be as high as possible. In the past decade, many research works have proposed techniques to enhance isolation in MIMO antennas. In this survey, we examined various mutual coupling reduction techniques employed to improve isolation in multiple antenna elements and compared them based on various performance metrics. Isolation enhancement techniques such as stubs, filters, defected ground structure, decoupling networks, orientation of the radiating elements, parasitic elements, periodic structures, neutralization lines, metamaterials, etc., are discussed in this paper.
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