A Dual Polarized Vivaldi Antenna with the Notched Band by Feed Line Filter on Conductive Plane

In this paper, a dual polarized Vivaldi antenna with the notched band by the feed line filter on conductive plane is presented. Two Vivaldi antennas are intercrossed vertically to realize dual polarization. Each Vivaldi antenna is placed on the substrate with the size of $\pmb{62\times 50.5\mathrm{mm}^{2}}$. The thickness and relative permittivity of substrate are 0.6 mm and 2.65, respectively. In addition, the front-to-back ratio of the antenna is improved by adding the 160 mm diameter conductive plane below. The notched band is achieved by introducing printed capacitively loaded loop (CLL) resonators close to the feeding line as filter of the Vivaldi antenna. The simulated and measured results demonstrate that the antenna achieves an impedance bandwidth from 2.6 GHz to 14.9 GHz $(\mathbf{VSWR} \leq 2)$ except the bandwidth of $\pmb{6. 0\sim 7.5\mathrm{GHz}}$.