Dual-Polarized Magnetic-Dipole Phased Array with High Polarization Isolation inside ±60° Scan Volume for Multiband 5G Polarization MIMO

Abstract

A dual-polarized phased array operating from 26 to 40 GHz with high isolation and low cross-polarization is presented in this paper. To meet the requirement of high polarization isolation for the fifth-generation (5G) new radio (NR) polarization-based multiple-input-multiple-output (MIMO) systems, the low-profile magnetic-dipole (M-dipole) is designed at first for reducing the cross-pol. leakage from the long feedline of the traditional electric-dipole (E-dipole). Then, the tails of the M-dipoles are connected to form a continuous M-current sheet to extend the bandwidth. The double-layer meta-surface is later placed upon the proposed M-dipole to maintain the scanning performance. A 16 × 16 dual-polarized array prototype is fabricated to validate the correctness of this design. The measured results show an isolation > 52 dB and cross-polarized level < –50 dB. The radiation patterns are capable of scanning ±60° in both azimuth and elevation planes. The proposed array can be a promising candidate to overcome the issue of cross-pol. leakage in multiband 5G polarization MIMO systems.