“…[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] The researchers have reported several antenna designs and modifications in their geometry, including the Vivaldi patch, 10 rectangular patch, 11 sprocket gear wheel shape patch, 12 bowtie, 13 use of EBG and split ring resonator, 14,15 semi-annular patch, 16 flower bud shape patch, 17 FSS loaded patch with coplanar waveguide feed, 18,19 unidirectional antenna, 20 corner etched rectangular patch, 21 lamp slotted patch with defects in the ground plane, 22 elliptically slotted patch, 23 locked-key topology based patch, 24 and eagle shape patch 25 to achieve UWB characteristics. In addition, a variety of methods have also been reported for achieving band-notch performances, which include different shapes of the slots (such as ring and semi-circular slot, 16 modified inverted-U slot and symmetrical rectangular slot, 20 arc shape slot, 26 and S-shape slot 23 ), C-shape reflector, 27 circular split ring resonator, 28 stubs (such as L-shape stub 28 and C-shape stub 23 ), defects in the ground plane, …”