Abstract: This paper presents a modified circular Microstrip patch antenna fed by a coaxial probe. The proposed work makes use of parasitic layer and defected ground to improve the bandwidth of the antenna. IE3D version 12 is used to simulate the proposed work. Simulation result shows that the antenna resonates at 3.73 GHz and 5.07 GHz frequencies with improved bandwidth of 22.68 %. The antenna showed a huge increase in the bandwidth of 1.150 GHz for center frequency 5.07 GHz and 290 MHz bandwidth for center frequency 3.73 GHz.

Keywords: Microstrip patch antenna, Parasitic, Defected ground, Stacking