Compared to the narrow band antenna design, ultra wideband (UWB) antenna design has a lot of challenges. One of such challenge is the requirement that the return loss must be below 10dB bandwidth from 3.1-10.6GHz throughout the UWB frequency range. Other challenges include low cost, small size, light weight and good radiation patterns [1]. One of the characteristic of conventional planar monopole antenna have narrow impedance bandwidth due to their high quality factor [2].
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