​This study introduces a coplanar waveguide MIMO antenna design that offers both frequency and pattern reconfigurability. The antenna is intended for applications in WiMAX, WLAN, and X-Band. It is constructed using an FR4 substrate with dimensions of 1.6 mm thickness and 0.025 loss tangent. Based on the proposed design, MIMO antennas can operate at 3.5 & 3.9 GHz (WiMAX), 5.5 & 5.8 GHz (WLAN), and 10.5 & 12.5 GHz (X-Band). To accomplish this, two open-circuited 3mm x 3mm quarter wavelength transformers are linked to each radiator through PIN diodes. The performance enhancement of the reconfigurable MIMO antenna was fine-tuned utilizing microwave solvers in both CST and ADS. The system’s performance was validated through practical measurements. Furthermore, the analysis of diversity conducted on the suggested antenna reveals that the antenna has a low correlation coefficient (< 0.0001), channel capacity (< 0.4 bits/sec/Hz), and total active reflection coefficient (< 0 dB). The measured isolation of < -20 dB is noticed for all three states. Antenna peak gain is 6.2 dBi with over 80% efficiency. A MIMO antenna with these characteristics suits a wide range of wireless communication systems.

For further details​: https://ieeexplore.ieee.org/document/10654268​