Design of A Miniaturized Dual-Polarized UWB Vivaldi Antenna

In this paper, a miniaturized dual-polarized ultra-wideband (UWB) Vivaldi antenna with compact structure is presented. The application of conventional Vivaldi antenna is limited by large dimension in different fields. Therefore, a novel structure with two semi-elliptical slot edges and four resistors is employed to miniaturize the size of the antenna in this paper. The results of the simulation show that the proposed antenna impedance bandwidth of VSWR ≤ 2 is 2.2~13.7 GHz, and the size of proposed antenna structure is reduced to 35.8 mm × 29.2 mm. Besides, two Vivaldi antennas which are fed separately by microstrip-slot line balun are orthogonally placed to achieve dual-polarization with port isolation better than 16.1 dB. The simulated results show that good dual-polarization and miniaturization is obtained, and the proposed antenna is a good candidate for engineering applications.