Design and Optimization of Multiband Microstrip Patch Antenna with Defected Ground Structure

In this paper, we present a fractal shape slot based patch antenna for multiband operations. The fractal shape slot is designed on the rectangular patch and the antenna is fed through a microstrip line. The proposed design and feeding technique allows the antenna to operate at multiple frequencies in the range of 1-8 GHz. The proposed antennas have been modeled, designed and simulated using Computer Simulation Technology (CST) Microwave Studio. It is demonstrated through simulation that the microstrip patch antenna is resonating on frequencies: 2.858 GHz, 3.354 GHz, 4.4981 GHz, 5.583 GHz and 7.335 GHz with return loss of -22.999 dB, -21.0433dB, -11.5568 dB, -12.184 dB and -44.1674 dB respectively. This patch antenna is operating in different. These bands are suitable for WLAN and WiMAX as well as for C Band applications. Parametric study is also included to give an overview for the performance of proposed design.