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A printed UWB Vivaldi antenna is presented in this paper. Its geometry is based on a novel spline shape and optimised by an efficient global optimisation algorithm. A U-shaped slot is introduced into the geometry to notch out the 5.1 GHz to 5.8 GHz WLAN band. This can be used to mitigate interference between WLAN and UWB systems.
Matthias, J., Ammann, M. & McEvoy, P. (2008) UWB Vivaldi antenna based on a spline geometry with frequency band-notch. IEE Antennas and Propagation Society International Symposium, pp.1-4. San Diego, California, 5-11 July, 2008, doi:10.1109/APS.2008.4619652