Analysis of microstrip antenna performance by varying length of rectangular slot DGS

This paper presents the study on the effect of a rectangular slot defective ground structure on a rectangular microstrip patch antenna operating at 2.4 GHz. The rectangular microstrip antenna with rectangular defective ground structure(DGS) is simulated using HFSS software. The effect of defective ground structure on the rectangular microstrip patch antenna is observed by varying the length of the rectangular slot and the performance of the antenna in terms of return loss and bandwidth are analyzed. The simulation results show that the performance of the antenna is improved by inserting a rectangular slot defect on the ground plane and further improved by varying the length of the slot-defect. The bandwidth is increased from 56 MHz to 67 MHz and the return loss is improved from -20 dB to -39.31 dB.