A UHF ultrabroadband vivaldi-type direction finding antenna

A modern state of the art direction finder system consists of several direction finding (DF) antennas and the direction finder electronics. In order to achieve most accurate results for all azimuth directions the direction finder antenna system is often built using a circular antenna array. The need for light weight mobile DF systems leads to smaller DF antenna designs using less frequency bands to cover the whole frequency range. In this paper, an ultrabroadband DF antenna array covering the whole UHF frequency range from 0.3 GHz to 3 GHz is introduced. Unlike the common antenna designs using dipols [I, 2] the new design consists often vivaldi-type antenna elements to cover the UHF frequency range fully.