Design of Ultra-wideband Dual-polarized Vivaldi Antenna

In this paper, an ultra-wideband dual-polarized Vivaldi antenna is proposed, and a Vivaldi antenna element with "one" shaped slots is designed. The dual-polarized Vivaldi antenna consists of two identical and orthogonally placed Vivaldi antenna elements. In order to solve the crossover problem of the feeding structure, the size of the feeding structure of one antenna unit is kept unchanged, and the microstrip feeding length of the other antenna unit is slightly increased. The simulation results show that the ultra-wideband dual-polarized antenna has a Standing Wave Ratio VSWR<2.5 in the 3.18 similar to 18GHz operating frequency band,and the port isolation is greater than 23dB.The proposed antenna can be used in the anti-radiation seeker system.