A High-Gain Low Coupling 8-Port MIMO Antenna Array Working at 28 GHz with Compact Size

摘要

In this paper, a design of high-gain low coupling multi-port MIMO antenna array working at millimeter wave (mmW) band with compact size is proposed based on resonant cavity antenna (RCA). Specifically, a 8-port MIMO resonant cavity antenna array working at 28 GHz is presented, which consists of two layers of substrates. The upper layer is a frequency selective surface, and the lower layer consists of 4 dual-polarized microstrip patches fed by two coaxial SMA connectors. The gain of each MIMO port can be improved sharply by sharing the same resonator without feeding networks. Each port of the MIMO antenna array can obtain a gain around 16.2 dBi with a compact size of 25 mmx 25 mm (2.3 λ x 2.3 λ).