Dual-Polarized, Low-Profile Dipole-Patch Array for Wide Bandwidth Applications

This article proposes a low-profile, dual-polarized4× 4antenna array for the fifth-generation (5G) applications. It originates from our previous linear-polarized design, but with two split dipoles. For each polarization, the current on the split dipoles will cancel each other out in one direction. In contrast, in the orthogonal direction, the current can be regarded as a driven dipole to couple energy to four parasitic patches. The proposed element has a profile of only0.073λ ₀(where_λ ₀is one free-space wavelength at 27.85 GHz) with simulated standing wave ratio (SWR)× 4antenna array is designed, simulated, and experimentally demonstrated based on a subarray that can support two orthogonally mode excitations. The measured results present an overlapped bandwidth of 28.4% and more than 25 dB isolation. In addition, the maximum gains are up to 19 and 18.9 dBi for Ports 1 and 2 excitations, respectively. Our proposed design has great application potential in vehicle-mounted millimeter-wave radar and 5G communications systems.