A Compact Dual Trap Reconfigurable Ultra-Wideband MIMO Antenna Design

To address today’s communication challenges, like crowded frequency bands and intense interference, and enhance wireless communication systems’ channel capacity and spectrum use, this paper presents a compact, dual-trap reconfigurable ultra-wideband (UWB) MIMO antenna. For strong isolation, the ground plane initially features upper oval strip "T" branches and a defective ground structure (DGS). Additionally, "C" and "U" shaped slots are etched on the radiation patch and feeder, respectively, to suppress interference in both WLAN $(5.15 \sim 85$ GHz) and ITU $(8.01 \sim 8.5$ GHz) bands. Lastly, PIN diodes at slot ends enable trap reconfiguration in each frequency band. Experimental results demonstrate four UWB states - single-trap and double-trap - with single-trap bandwidths of $5.4 \sim 6.0$ GHz and $7.9 \sim 8.8$ GHz and double-trap bandwidths of $5.1 \sim 6.0$ GHz and $7.9 \sim 8.6$ GHz. Isolation surpasses 20 dB in the UWB band $(3.1 \sim 10.6$ GHz), and ECC is $\lt0.004$. In summary, this antenna offers trap reconfigurability and high isolation within the UWB spectrum, boosting spectrum utilization and minimizing interference among antenna units.