A Dual Linearly Polarized Array for 5G FR2

This paper presents a dual linearly polarized antenna array for the mm-wave band of 5G. The antenna element is a cross-dipole, suitable to obtain two orthogonal radiated fields, independently steerable in array arrangement. The design is conceived to allow its manufacturing in printed circuit board technology, so that the main focus of the work is to simplify as much as possible the geometry and the constructive critical issues. The antenna conductors and the feeding network (engineered in coplanar waveguide technology) are realized in the same laminate, and a second board is applied onto to implement the balun. This upper dielectric layer acts as superstrate on the dipoles as well. The overall structure, which consists of two printed circuit board laminates and a low-loss resin layer that holds them together, is less than 2 mm thick. The antenna has a 7% bandwidth around 27.28 GHz, and a steering capability which covers a ±30% angular width for both the linear polarizations.