Design and simulation of Koch Snowflake fractal antenna for GPS, WiMAX and radar application

This paper represents, design and simulation of micro strip patch antenna having Koch Snowflake Geometry. The antenna has been designed by increasing the perimeters of triangular shape patch by using self-similarity property. The multiband nature is obtained, by designing antenna up to second iteration. The designed antenna operates in four frequency bands for different applications. First frequency band is 1.41GHz-1.65GHz which covers the GPS operating band, second band is 3.41GHz-3.81GHz & third is 5.41GHz-5.80GHz both band covers the WiMAX operating range, 7.75GHz-8.13GHz is the last band which covers the X-band. X-band is used in radar application. The antenna is designed and simulated using CAD FEKO electromagnetic simulation software. The designed antenna is fed by a 50-Ω co-axial line and fabricated on a low-cost FR4 substrate having dimension 80(L) × 80(W) × 1.6(h) mm3 with εr =4.4 and tanδ= 0.025. This antenna shows acceptable gain with directional radiation patterns in the frequency bands for wireless applications.