Publication

Abstract : This paper proposes a modified wideband antenna using semi-elliptical ground plane for ultra-wideband application. These microstrip patches are excited using microstrip line feed technique. To improve the gain performance quadrature portion of the circle part is removed both upper and lower edge corners and adding triangular slot in the ground plane model using Defected Ground Structure (DGS).After that truncate the diagonal corners for circular polarization and also improve the gain performance. It is designed in a variety of shapes in order to obtain enhanced gain and bandwidth. The resonant frequency is 6.85 GHz and the flame retardant (FR4) substrate is used with dielectric constant 4.4 and thickness about 1.578 mm. The optimization is achieved by varying the length and width parameters. During simulation process the gain, s-parameter, radiation pattern, vswr and directivity of proposed antenna has been obtained. The feed network is designed and optimized using Computer Simulation Technology(CST) to cover a frequency range is 3.1 GHz to 10.6 GHz.