Then I studied all antenna parameters by increasing the
height of the substrate of Structure A and keeping whole
remaining structure same as it was with h=0.8mm. I
kept h=0.05 , means h=2mm. There is further
improvement in BW and rad. efficiency, while all other
parameters are same with negligible change as compared to
the DR disc loaded antenna with h=0.8mm. Here 15.92%
(1.18 GHz) BW and 99.1% rad. efficiency is achieved. RL
plot for this structure is shown below: