A Low-Profile Dual-Band Eight-Port MIMO PIFA Antenna for 5G/WLAN Sub-6 GHz Mobile Terminal

In this article, an 8-port, 8-element dual-band multiple input and multiple output (MIMO) Planar Inverted F-Antenna (PIFA) having a height of 2.5 mm is proposed for the 5G/WLAN sub-6 GHz mobile terminal. For achieving dual-band operation with wide bandwidth, a parasitic element and L-slot are added to the PIFA, whereas a rectangular open-ended ring is printed on the top substrate next to the parasitic element. The results show that the proposed MIMO antenna system operates at 3.43–3.8 GHz and 5.15–5.85 GHz with −6dB impedance bandwidth condition. The minimum isolation achieved between two adjacent antenna elements is better than 12.1 dB in the lower band, while in the upper band is 16 dB without using any extra decoupling techniques. Moreover, radiation efficiency, radiation pattern, envelop correlation coefficient and diversity gain are all presented in this article, showing good MIMO performances of the proposed antenna which makes it promising for 5G sub-6 GHz mobile terminal.