In recent years smart antenna is a fast rising areas of communication systems. Smart antennas are especially aggressive of their applications in related fields such as Fourth Generation (4G) technologies and these are best suitable for multi carrier modulations. In this paper, contains main utilize of smart antennas in mobile communication that upgrades the capability of the mobile devices as well as enhanced the cellular system for example fast and high bit rate, multi-use interference and space division multiplexing technique, enlarge the range, deduction of errors because of multi-path fading along with another enormous benefit is the higher security.