In this paper, the combination of concentric square loop and the Koch curve fractal geometries based microstrip antenna design for ultra wideband (UWB) applications is presented. This fractal structure is implemented on a empty square. Three progressively concentric square loop is applied inside the empty square and a full square is applied to the center for the first iteration. Then, a Koch curve fractal is applied to the lines of the first iteration. The proposed antenna is miniaturized (44 × 43 mm2) and has multi-band characteristics. Simulation results show that the presented antenna has a reflection coefficient characteristic < −15dB, 80% radiation efficiency, 4–6dBi antenna gain and omni-directional radiation pattern properties over the full UWB bandwidth (3.1 – 10.6 GHz) while showing the band-rejection performance in the frequency band of 4.75–6.75 GHz.
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机译：在本文中，提出了基于同心方形环路和基于Koch曲线分形几何形状的微带天线设计的组合，用于超宽带（UWB）应用。这种分形结构是在一个空的正方形上实现的。在空正方形内部应用三个逐渐同心的正方形环，并在第一次迭代中将一个完整正方形应用于中心。然后，将Koch曲线分形应用于第一次迭代的直线。所建议的天线是小型化的（44×43 mm 2 ），具有多频带特性。仿真结果表明，所提出的天线在整个UWB带宽（3.1 – 10.6 GHz）上具有反射系数特征<−15dB，辐射效率80％，天线增益4–6dBi和全向辐射方向图特性，同时显示出频带抑制性能在4.75–6.75 GHz频段内。
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