This work presents a four-port dual-band broadband linearly polarized Multiple-Input-Multiple-Output (MIMO) textile antenna for Wireless Body Area Network (WBAN) and Fifth Generation (5G) sub-6 GHz band applications. The MIMO antenna design starts with a double element with a Split-Ring (SR) bar slotted, which resonates at dual-mode frequencies (2.45 GHz and 3.5 GHz). The dimension of the single patch radiator is 47.2 x 31 mm2. The proposed four-port dual-band MIMO textile antenna consists of four SR bar slotted patches antennas based on the two-port SR bar slotted MIMO textile antenna. This antenna is made fully by an all-textile with radiating elements by the conductive textile. The proposed antenna achieves the following satisfactory Reflection Coefficient <-10 dB, Mutual Coupling (MC) < -15 dB, very low Envelope Correlation Coefficient (ECC < 0.005), and Diversity Gain (DG) of about 10 dB. The simulated results show that the proposed design can cover the operating impedance bandwidth of about 4.2% and 6.7% in the 2.45 GHz and 3.5 GHz. The minimum MC of -18 dB with a peak realized gain of 6 dBi are attained. These results are achieved under flat condition on-body placement.
