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This paper proposes a tuning study of 3 basic geometric structures of monopole antenna: rectangular, circular, and triangular shapes fed with coplanar waveguide for ultra-wideband (UWB) applications as the IEEE 802.15.3a standard which covers the frequency band of 3.1-10.6 GHz. The frequency bandwidth enhancement technique exploited in this work is the slotted on the ground plane. All types of designed antennas have the overall size of 34×34 mm2. It is fabricated on FR-4 printed circuit board (PCB) whose thickness is 0.764 mm. The antennas are analyzed and designed by using the electromagnetic field simulation CST program to optimize to the best structure for antenna fabrication. In the antenna measurement, the results showed that the best responds S11 < -10 dB cover the frequency band of 2.97-12.26 GHz was obtained from the rectangular monopole. The bandwidth ratio was 4.13:1. The radiation pattern was omni-directional pattern. The average gain over the frequency band was 3.07 dBi and the antenna efficiency was over 99.63%.
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