Highly directional planar Ultra Wide Band antenna for radar applications

We describe a novel planar highly directive Ultra Wide Band (UWB) antenna based on a disc monopole fed by a 50- Ohm microstrip line. The key feature of the proposed antenna is a careful engineering of the ground plane that permits to increase directionality for radar applications. We demonstrate through numerical simulations and measurements in anechoic chamber that the designed antenna exhibits low return loss, high directivity and good time-domain properties in the band of interest between 6 and 8 GHz.