Enhancement of bandwidth through I-shaped Defected Ground Structure

This paper discuss on a rectangular microstrip patch antenna incorporated with I-shaped Defected Ground Structure (DGS) metamaterial which exhibit an enhancement of 118% bandwidth compared to the conventional design. The antenna is designed for S-band application, resonates at 2.45 GHz. The I-shaped DGS shows the metamaterial characteristics with negative permeability, μ and permittivity, ε through Nicolson-Ross-Weir method. The circuit was designed using Computer Simulation Technology (CST) Microwave Studio. Based on the simulation, the antenna also shows other improvement in term of gain and return loss of 17.6% and 71.89%, respectively. The Size of the radiating patch was also reduced for about 21% The performance of the fabricated antenna such as antenna gain, return loss, bandwidth and directivity were also measured using the Vector Network Analyzer (VNA) for a verification.