DESIGN AND ANALYSIS OF FRACTAL ANTENNA WITH FRACTAL SHAPED DEFECTED GROUND STRUCTURE by Navneet Kaur
Abstract
With the rapid growth of wireless commercial applications such as WLAN, Wimax, mobile data the need for multiband and wideband antennas increase rapidly. Various design approaches were given by different researchers. Microstrip antennas came into existence, but they have narrow bandwidth. Fractal antennas overcome this problem by their properties of self-similarity and space filling. Fractal antennas show multiband and wideband behavior. Defected Ground Structure (DGS) is an etched structure in the ground plane of the antenna which perturbs the current distribution and various other characteristics of the antenna. In present work, fractal shape is used in the ground plane of the fractal antenna to get better performance. This antenna is designed for two substrate materials- RT Duroid and FR4. A Koch shaped fractal square is used on the radiating patch of the antenna. A new fractal shape is used in the ground plane of the antenna. This antenna shows multiband and wideband behavior with improved values of return loss, gain and efficiency. For the analysis and verification of the antenna, various simulations are performed for the proposed antenna with conventional ground plane. So, the proposed antenna shows better results with fractal DGS as compared to the conventional ground plane. The proposed antenna is fabricated with FR4 substrate. Then, the antenna is tested with Vector Network Analyzer (VNA).
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