JCS_V3_N1_RP5 M. Alwin P. Jothilakshmi Journal on Communication Engineering and Systems 2277-5242 3 1 28 32 Reconfigurable Antenna, PIN Diode, Microstrip, Cognitive Radio, Software Defined Radio A simple new design of Microstrip Patch Antenna has been designed to tune a set of different discrete frequencies. The frequency variation is achieved by changing the electrically actuated RF switches. The antenna’s operative condition is controlled between different states by biasing. The simulation of the designed antenna is done using Advanced design system and its observed parameters are documented in this paper. November 2013 - January 2014 Copyright © 2014 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=2635