Performance Enhancement of a Microstrip Patch Antenna Using DGS and an Optimized Mushroom-Like Structure

This paper presents the design of a 5.8 GHz microstrip antenna using defected ground structure (DGS) and an optimized mushroom-type structure. The proposed DGS improves the bandwidth of the antenna but degrades its radiation. For this reason, a mushroom-like structure is designed using the particle swarm optimization (PSO) algorithm to cover the frequency band of interest. The optimization and simulation of the structure were performed using MATLAB and CST MWS. The results show that the combination of DGS and mushroom-like structure enhances significantly the gain and bandwidth of the antenna.