A CPW-Fed Two-Port Compact Wideband Circular Shaped MIMO Antenna for Satellite Downlink Communication.

This paper introduces a highperformance multiple - input - multiple - output (MIMO) antenna featuring a compact circular shape with slots, fed through co-planar wave-guide (CPW), emphasizing low mutual coupling. The proposed antenna has been physically realized using an FR4 substrate. Enhancing the antenna characteristics involved creating slits positioned at a 120-degree angle to each other, alongside a central circular-shaped slot within the patch. The arrangement of antenna elements involves an edge-to-edge distance of 0.18λ (4mm) to ensure isolation surpassing 15dB across the entire wideband range. The compact MIMO antenna overall dimension is 0.81λ x 1.45λ x 0.073λ (18 x 32 x 1.61 mm3). The CPW-fed circular patch MIMO antenna proposed in this study resonates at 12.611 GHz, and 13.852 GHz, exhibiting an impedance bandwidth of 2.65 GHz (12.116 GHz to 14.772 GHz). It showcases a reflection coefficient of -31.833dB and achieves an observed gain of 5.81 dBi. The observed results include a low envelope correlation coefficient (<0.025) and a high diversity gain (>9.87) at the resonating frequency. The measured outcomes closely align with the simulated results, indicating the efficacy of the designed wideband antenna. The designed wideband antenna is suitable for satellite downlink communications to transmit data at a higher rate. [ABSTRACT FROM AUTHOR]