Ultra Wideband Compact Vivaldi Radiator with 3:1 Bandwidth

In this paper presents the design of the ultra wideband compact antenna arrays radiator based on the Vivaldi antenna. The study results of the depending of the radiation characteristics of the geometrical parameters are shown. The dimensions size of the radiator is 50 mm x 50 mm x 65 mm. The operation frequency band on the level of the VSWR less than 3 is from 0.974 to 3.0 GHz (3.08:1). The realized gain is from minus 6.05 to 4.62 dB. The radiated power is in the range from 0.75 to 0.97 W.