Planar UWB Antenna for MIMO/Diversity Applications

Ultra-wideband (UWB) communication technology is found to be suitable for short-range high-speed data transfer. But due to the limitation of maximum transmit power, the range and channel capacity are the matter of concern. If we use MIMO technology in UWB-based system, the channel capacity and rate of data transmission can be made better. After 2002 when Federal Communication Commission (FCC) declared a dedicated frequency range to UWB system, a lot of research has been carried out on MIMO antenna for UWB system. Although there are several challenges like the issue of size and compactness appeared, when a number of antenna elements were increased. There was another problem of mutual coupling between closely spaced radiating elements. Use of printed antenna technology was found to be helpful in the reduction in size and area of antenna significantly. Similarly, for the reduction of mutual coupling, several isolation techniques had been incorporated for significant reduction of mutual coupling as well as correlation coefficient. An extensive survey is presented here to appreciate and acknowledge the research carried out in design of UWB antenna for MIMO applications.