Antenna gain is a vital feature in determining antenna
performance. Fig. 9(a) shows that the antenna gain has a gain
variation of from 2.1 dBi to 2.5 dBi for the frequency range of
2.2 GHz to 2.83 GHz. Besides this, Fig. 9(b) shows that the
antenna gain has a gain variation of from 3.7 dBi to 5.23 dBi
for the frequency range of 4.5 GHz to 13 GHz. These are very
good gain values for a quasi or partial omni-directional
antenna.