Reduction of Mutual Coupling in Metamaterial Based Microstrip Antennas: The Progress in Last Decade

Compact multiple antennas are attracting much attention because of the rapid growth of the wireless multiple input multiple output communication systems. An important challenge in multiple antenna system is mutual coupling effects. A brief review of reduction of mutual coupling in antenna arrays by using metamaterial is presented. Different types of metamaterial structures like electromagnetic band gap substrate, defected ground structure, split ring resonator, complimentary split ring resonator, soft surfaces/high impedance surface and mender line structure are described along with their operational principles. Whereas the problems associated along with the comparison and comments on their scope of applications are analyzed.