Isolation Enhancement Techniques for UWB-MIMO System : A Review

The UWB-MIMO system is the combined technology of ultra wide-band (UWB) and multiple input and output(MIMO) technology that provide higher data rate (more than 3 Gb/sec)and greater channel capacity [1] in modern wireless communication system. The design challenges for MIMO antenna are mutual coupling and size of antenna. The mutual coupling increases, when antenna elements are placed close together with separation less than a quarter wavelength. Furthermore, various isolation method have been introduced by researchers to reduce interference among antennas and also enhance isolation. An efficient and excellent UWB-MIMO antenna can be obtained by introducing improve isolation techniques that will suppress the interfering band with UWB frequency band. Therefore, this paper presented a state-of-the-art of various isolation improvement techniques.