IMPROVEMENTS IN A HIGH GAIN UWB ANTENNA WITH CORRUGATED EDGES

In this paper, a novel corrugated structure at the edges of the Vivaldi substrate is presented. Compared with the Vivaldi antenna without corrugated structure, the new structure has a better radiation pattern. While compared with the traditional corrugated structure, the new structure has a better front-to-back ratio (F/B ratio). Properly chosen thickness and dielectric constant of substrate ensure a relatively small size while the lower frequency is around 1GHz. A Vivaldi structure also promises high gain in ultra-wideband (UWB) range. For its planar structure, the antenna is easily fabricated with a low cost. The design of a novel Vivaldi antenna described in this paper operates from 1GHz to more than 3GHz with ¡10dB return loss and produce the gain with a range of 7dBi » 11dBi. The current design is one of the most ideal antennas to be used for through-wall radar.