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It is well-established that the planar monopole antenna exhibits wideband impedance matching characteristics, high radiation efficiency, and an omni-directional pattern that makes it a desirable candidate for ultra-wideband (UWB) applications [1-2]. However, the radiation pattern deteriorates rapidly towards the high frequency end. Antennas fed with co-planar waveguides (CPW) have the further advantages of low dispersion for wideband applications, reduced radiation losses, and ease of fabrication . Authors in  have demonstrated that the pentagon shape microstrip slot antenna shows an UWB impedance and radiation performance. Other authors in [5-6] have also investigated planar monopoles and techniques to improve the impedance bandwidth, but less emphasis has been placed on reducing pattern degradation over the band.
Date of Conference: 11-17 July 2010