Dual-Band Pattern Reconfigurable 5G Antenna using Dual-Band BLC

A design of two elements pattern reconfigurable dual-band (2.6/3.6 GHz) and broadband Multiple Input Multiple Output (MIMO) antenna for excepted 5G wireless communication systems is proposed in this paper. The antenna structure is simple, compact and only occupied a small space of 18×5.5×4.5 mm3. Pattern reconfigurability is achieved by using a dual band Branch-Line Coupler (BLC). BLCs are commonly used in balanced amplifiers and mixers for achieving good return loss, as well as spurious signal rejection. In antenna design area, couplers, particularly Ring Hybrid Couplers are used to get high isolation between ports. In this work, we propose the use of BLC for doing both decoupling antenna system and pattern reconfigurability. Simulated and measured S-parameters are presented in this paper. The measured results show that the proposed MIMO antenna system achieves in each band isolation between ports better than 25 dB, more than 80 percent efficiency and has a maximum gain of 2.74 dB.