State of the Art Techniques for Cognitive Radio Antenna Design

In this letter, a survey of different recent state of the art techniques that have been deployed in the design of antennas that can perform excellently for cognitive radio application is carried out. Cognitive radio system fundamentals and antenna requirements for its smooth operations are also discussed. The performance of the antennas designed by various techniques in terms of, the radiation pattern, VSWR/Return loss, peak gain, radiation efficiency are discussed. Issues relating to the design techniques and some factors to consider when designing a suitable antenna for cognitive radio system also highlighted.