Gain and bandwidth enhancement of CPW-fed patch antenna for wideband applications

The gain and bandwidth enhancement of coplanar waveguide (cpw) fed monopole antenna using hexagonal ring shaped defected ground structure (DGS) for a frequency range of 0.1GHz-20 GHz is presented in this paper. A comparative analysis of the antenna without DGS and the antenna using DGS is made and simulated using the High Frequency Structural Simulator (HFSS) at the frequency 6 GHz. The return loss, gain and radiation patterns for the proposed design have been presented and analyzed to exhibit the performance of the design proposed. Simulation results reveal that there is a remarkable amount of increment in gain and wideband nature as the DGS technique is inserted in the ground plane of the design. A maximum gain of 22.80 dB and return loss of -25.7541dB has been achieved at frequencies 8.5GHz and 8.1GHz respectively. The frequency bands of 6780 MHz, 450 MHz, 230 MHz, 550MHz and band ranging from 11.50 GHz to excess frequencies having return loss below -10dB is achieved for DGS structured design.