A small novel rectangular microstrip-fed antenna for ultra wide band applications

In this paper a small effective design of compact micro strip UWB antenna with step impedance micro strip-feed line is proposed. The antenna consists of an indented rectangular patch with many small effectives lots on the front face of the substrate and a partial ground is indented on the bottom of the substrate. The antenna patch has dimension 34mm ×36mm (L×W) is fabricated usingFR-4epoxy dielectric with thickness 1.6mm and relative permittivity of 4.4. The proposed antenna has the band width capability of operating frequency between 3.2GHz to 10.9GHz with a 7.7 GHz bandwidth (fh-fl). The designed antenna has Omni-direction radiation pattern on most of the Operating band. Feed line used has characteristic impedance of 49.6ohm. The proposed antenna is analyzed in time domain to check its appropriateness for UWB applications. In the design Antenna the bandwidth is increased up to 106%. The proposed antenna has measured VSWR value <;2. Antenna parameters such as return loss and radiation pattern show reasonable agreement with the reenacted results.