Mutual Coupling Reduction Techniques for UWB—MIMO Antenna for Band Notch Characteristics: A Comprehensive Review

With the rapid advancements in wireless communication systems, the applications that have emerged recently such as the Internet of Things (IoT), machine-to-machine communication, vehicular communication and video on demand, etc. require very high data rates in short-range communication for better reliability. Antenna systems utilized in traditional communications are not suitable for these applications. Ultra Wide Band (UWB)–Multiple Input Multiple Output (UWB–MIMO) antennas have proved to fit these requirements owing to their improved capability and reliability in short-range communication. The major challenge in designing the UWB–MIMO antennas is to reduce the mutual coupling effects among multiple antennas. In this paper, various techniques for mutual coupling reduction are presented and analyzed such as Electromagnetic band-gap (EBG) structures, meta-materials, parasitic or slot, and stub structures, neutralization lines, etc.