Size reduction and radiation optimization on UWB antenna

This paper deals with miniaturization techniques and radiating optimization on UWB antenna in order to make an antenna array. The hard point with size reduction of an antenna is the back radiation, the cross polarization and the antenna adaptation. Several methods to keep the antenna adapted to our bandwidth [300 MHz - 3 GHz] are studied. A detailed study of the travelling wave elementary antenna is proposed. Some techniques are applied to reduce back radiation and cross polarization by the use of slots in order to reduce back radiation and resistive loads in order to reduce surface current levels and side cross polarization.