XPD Enhancement and Decoupling of $\pm 45^{\mathrm{o}}$ Dual-polarized Antenna Array by Parasitic Strips

A parasitic metal post scheme is proposed to enhance the cross-polarization discrimination (XPD) of $\pm 45^{\mathrm{o}}$ dual-polarized cross-dipole antennas in this paper. The technique's effectiveness is verified by designing vertical and horizontal $\pm 45^{\mathrm{o}}$ dual-polarized antenna elements. The array-antenna decoupling surface (ADS) decoupling scheme and the proposed XPD enhancement scheme are applied to four $2\times 2$ arrays to explore the relationship between enhancing XPD and decoupling. The results show that decoupling and enhanced XPD are independent, due to which the design of large-scale base station (BS) arrays can be convenient in future methodologies.