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In this work, the design of Koch monopole fractal antenna to be used in wireless communications at the ISM frequency band is presented. Antenna's shape and dimensions are optimized to achieve area minimization, by applying the properties of fractal shapes at the radiating slots. The property of self-similarity that fractal shapes possess has been successfully applied in other types of antennas with great success. The effects of fractal miniaturization in this type of antennas, mainly regarding the radiation pattern, the antenna efficiency, and applicability of fractal shapes in the design of antenna as for wireless communication systems are presented herein.