A quad-port MIMO antenna is constructed and studied in this communication with single resonating bands (wideband) for WLAN & WiMAX applications. It is designed by etching out a circular slot from a patch placed on the front side of the substrate & a feeder line on the backside of the substrate. The proposed structure has ≤-10 dB impedance bandwidth of 2540 MHz (4.36–6.90 GHz). To legitimize the work attributes of the proposed MIMO antenna, diversity parameters such as total active reflection coefficient; envelope correlationcoefficient (ECC) & diversity gain are calculated. The isolation is more than 25 dB, justifying the suggested design’s acceptability as a quad-port MIMO antenna. The suggested design’s examination revealed the steady performance and a high degree of agreement between the simulated and measured findings.