Fractals have very unique properties, Therefore in recent years, antenna designers use fractal geometry in ultra wideband antennas designing. In this paper, we have achieved an ultra wideband antenna by applying a Koch fractal geometry to a wire square loop antenna. Modelling and simulation is performed via SuperNEC electromagnetic simulator. Also, optimization is performed via GAO (genetic algorithm optimiser). This antenna is easy to be fabricated and has successfully demonstrated multi-band and broad-band characteristics. Results of simulations show that the proposed antenna has very good performance in bandwidth and Radiation pattern.
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