<strong>Paper Title</strong><br>
Ultra Wide Band C Shaped Monopole Antenna For Cognitive Radio Applications<br>
<br>

<strong>Abstract</strong><br>
 This paper presents an antenna scheme suitable for cognitive radio applications. The  omni directional c-shaped
monopole  disc  antenna is  designed to achieve impedance matching for ultra wide band  range  The  proposed  antenna  uses 
FR-4  substrate  having  thickness  of  1.6mm  and  dielectric  constant  4.4  The  antenna  achieves  an  enhanced  impedance 
bandwidth of  121.36  % covering from 4.666  to  12  GHz with a stable radiation performance and omnidirectional radiation 
pattern.  The  radiated  patch  occupied  a  total  volume  of  50  x  60  x  1.6  mm.  The  antenna  suitable  for  cognitive  radio 
applications was designed and analyzed by means of an e.m. design tool cad-feko