Design of dual-band dual-polarized magneto-electric dipole antenna for 5G microcell base station

A novel dual-wideband dual-polarized magneto-electric (ME) dipole antenna for 5G microcell base station is proposed, the bandwidth of which can completely cover the long term evolution(LTE) main band and 5G mid-band. By using a pair of orthogonal ME dipoles and Γ-shaped tapered cross feeding lines, the initial antenna achieved dual-band and dual-polarized. Then, four H-shaped slots, added in electric dipoles, effectively extend the lower impedance bandwidth. Finally, a circular parasitic patch with capacitive properties is innovatively loaded above the ME antenna, which obviously reduces the high resonant frequency. Meanwhile, a box-shaped reflector is employed to achieve stable gain and radiation pattern. As a result, the measured results show good achievements of dual-wideband of 58.2%(2.11-3.84 GHz) and 8.9%(4.72-5.16 GHz) with S_{11, 22} < -10 dB, high isolation (|S₁₂|>25 dB) and high gain (9.3 dBi and 7.2 dBi) in the these two bands. In addition, a stable radiation pattern with half-power beam width (HPBW) of 61°±6° and high cross polarization discrimination (XPD) (>20 dB) on the E-plane are realized over the dual-band. Moreover, with simple structure and excellent performance, the proposed antenna can be used as a good candidate for the LTE/5G microcell base station antenna.