Minkowski Fractal Antenna with Circular DGS for Multiband Applications

To cater demand of multiband operating applications a low-profile microstrip antenna comprising Minkowski fractal architecture and defective ground structures (DGS) is proposed. The self-similar minkowski fractal developed in 4 iteration levels is presented. Circular defects are etched in ground plane of the proposed iteration 4 antenna to enhance performance of antenna and to obtain multiband operation. Results observed for basic iterations and iteration 4 for both with and without DGS configurations is presented. With 3 mm circular defect in ground plane the iteration 4 antenna operates over various frequencies within range 5.38 GHz – 20.73 GHz. In terms of gain the 7.9 dBi gain offered by the iteration 4 with 6 mm circular DGS is higher than 7.5 dBi gain offered by iteration 4 with 3 mm DGS.