Design of a broadband circularly polarized magnetoelectric dipole antenna for 5G millimeter-wave applications

In the letter, a planar broadband circularly polarized slot-coupled magnetoelectric dipole antenna for 5G millimeter-wave (MM-wave) applications is proposed. The antenna consists of two dielectric substrate layers and three copper cladding layers. The electric dipole is formed by a pair of parallelogram-shaped patches located on the top layer, while the magnetic dipole is shaped by two pairs of metal columns and the gap between them. The electric and magnetic dipoles are constructively combined, thus generating the circular polarization. To enhance the impedance matching and circular polarization performance, multiple parasitic quadrilateral patches are designed around the edges of the parallelogram-shaped patches. Simulations demonstrate that the proposed antenna achieves a 33% impedance bandwidth, operating from 50.68 GHz to 70.39 GHz. It also exhibits a 25.56% 3 dB axial ratio bandwidth (AR-BW) ranging from 52.25 GHz to 67.56 GHz. The maximum antenna gain is approximately 8.5 dBic.