Circular Microstrip Patch Monopole Antenna for Wireless Communication

A compact monopole microstrip circular patch antenna having defected ground plane(DGP) with center notch is presented in this paper. This circular patch antenna is feed by microstrip line feed. Optimum results are observed when gap between the radiating patch and DGP is 1.5mm and for centered feeding of microstrip feedline. The obtained reflection coefficient is less than -10dB for a wide frequency range of 1.9GHz to 14 GHz which covers the complete bandwidth of ultrawideband (UWB- ranges from 3.1-10.6 GHz). The proposed antenna has been designed on a FR4 substrate with dielectric constant єr = 4.4, loss tangent (tan δ) = 0.02. The radiation pattern is directional in E-plane and nearly omnidirectional in H-plane. Efficiency decreases at the higher frequency edge due to the lossy substrate and it is upto 70%. The UWB antenna is simulated using CAD FEKO 6.2 suit electromagnetic simulator using MoM (Method of Moment).