Design of a planar monopole antenna for use with ultra-wideband (UWB) having a band-notched characteristic

The design of planar monopole antennas for use with UWB and having band-notched characteristics is demonstrated. A GA code is used to develop a reduced size planar monopole which exhibits good impedance matching and stable radiation towards the horizon across the entire UWB band. Part of the metal is then removed from this design to create a band-notched characteristic. While this feature offers significant attenuation in the notched band, it has little effect on the antenna operation outside of the band. An analysis demonstrates the resemblance of this feature to a quarter-wave, open-ended transmission line, and that the notched band can be varied by changing the size of the feature.