Design of Dual-Polarized Vivaldi Antenna

This letter presents a novel dual-polarized antenna based on two orthogonally placed Vivaldi antennas intended to be used as feed for reflector antennas. The antenna is designed with a special feed network to achieve linear polarization in 4 – 6 GHz band and circular polarization in 14 – 16 GHz. Feed network is integrated with Vivaldi radiators to ensure a compact form factor critical for reflector applications. The antenna achieves better than −15 dB input reflection for most of the operating bands and an axial ratio better than 2 dB for the upper frequency range.