High-Gain Dielectric-Loaded Vivaldi Antenna for $K_{a}$ -Band Applications

In this letter, a novel concept of a high-gain Vivaldi antenna operating in the K
_a
frequency band is proposed. The antenna is fed by the substrate integrated waveguide. The concept overcomes shortcomings of conventional antipodal Vivaldi antenna using dielectric load with printed metal transition and transverse ripples. The added parts are optimized to obtain a wideband high-gain antenna with low cross polarization. The fabricated antenna shows very good performance over the entire K
_a
band where the measured gain is more than 10.5 dBi.