In this paper, a design of a dual-band Koch fractal antenna is proposed. Patch antenna has dimensions of 30 mm × 18 mm × 0.76 mm which operates in ultra-wideband (UWB) with a notch band from 5 to 6 GHz. Further, the design is modified using different Koch fractal geometries to observe the multi-band resonant behavior of the antenna. The modified antenna has dimensions of 18 mm × 18 mm × 0.8 mm. By modifying the shape of radiating patch and ground with fractal shapes and by introducing slots, impedance bandwidth and radiation characteristics were improved. The proposed antenna works well for WiMAX and WLAN applications with approximately 95% radiation efficiency. The parametric analysis is carried out for various parameters in order to obtain better return loss characteristics. The design is simulated using HFSS software, and the performance is measured by obtaining the antenna parameters.
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