In recent years the demand for wireless systems with highest data rate, improved coverage, low latency extensively increasing. Systems operating in sub-6GHz frequency band can provide a good mixture of coverage and capacity for high speed 5 G services. The channel capacity can be improved using Multiple-Input Multiple-Output (MIMO) antennas but it will not meet the modern day wireless communication demands. Application of Cognitive Radio (CR) technology enables the unlicensed users to access the spectrum results in higher spectral efficiency, supporting higher number of users, higher throughput and achieves higher coverage. Two types of antennas which include an UWB antenna for sensing and a reconfigurable antenna for communication are required for cognitive technology. In order to avoid two separate antennas for sensing and communication a single reconfigurable antenna can be used for both sensing and communication. This paper reviews about reconfigurable antennas and reconfigurable MIMO for CR applications in sub-6GHz band that extensively reduce the complexity in structure and antenna size.
Volume 12 | 04-Special Issue
Pages: 1397-1408
DOI: 10.5373/JARDCS/V12SP4/20201618