Koch fractal antenna using right angled isosceles triangular microstrip patch antenna structure for WiMAX

A dual band CPW-fed Koch fractal antenna, suitable for WLAN and WiMAX operations, is proposed in this paper. The antenna has been designed by increasing the perimeters of right angled isosceles triangular shape patch by using self-similarity property. The proposed antenna is fed by a 50Ω Microstrip line and fabricated on a low-cost FR4 substrate having dimensions 40 (L) × 40 (W) × 1.59(H) mm3. The antenna shows acceptable gain with nearly omni-directional radiation pattern in the frequency band for wireless applications. In second iteration defect in ground is introduced for better gain.