JCS_V6_N1_RP5 Hemant Verma Sudhanshu Verma Journal on Communication Engineering and Systems 2277-5242 6 1 38 41 Cognitive Radio (CR), Slot Antenna, Ultra-wide Band (UWB) Antenna An integrated Ultra-Wide Band (UWB)/ reconfigurable slot antenna is proposed for cognitive radio applications. The proposed antenna consists of an elliptical shape UWB disc monopole and a H-shaped slot resonator, which is precisely embedded in disc monopole. The UWB antenna covers entire UWB band from 3.1 to 10.6 GHz and is used for channel sensing. The H-shape slot resonator works as a narrow band antenna operating in the range 7.2 to 8 GHz. The slot is fed by off-centered microstrip line that creates the desired matching across tunable frequency band. The proposed antenna design is simulated using HFSS 15. November 2016 - January 2017 Copyright © 2017 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=10352