Design of a Super Wideband Mimo Antenna with Hexa-Notch Interference Suppression and Isolation Enhancement

The demand of Super Wideband (SWB) Multiple-Input Multiple-Output (MIMO) antennas has surged due to their critical role in applications such as radar imaging, cognitive radio, militar y communications and long-range RF communication systems. However, conventional MIMO antenna designs face challenges such as inter port coupling, bandwidth constraints and frequency interference which degrade signal quality and overall system performance. To address these limitations, this research proposes a novel Hexa-Barrier Super Wideband MIMO antenna (HBSWB MIMO) with 8 × 8 configuration, designed to enhance isolation which improve impedance bandwidth and mitigate interference through an advanced multi stage design approach. The proposed antenna incorporates a four petal flower shaped radiator with a sickle shaped self-complementary structure, crafted from Silver to ensure super conductivit y, smooth impedance transitions and enhanced radiation efficiency. To optimize interference suppression, a Hexa-Notch design is introduced utilizing U-shaped slots and C-shaped stubs to filter unwanted frequency bands, including WiMax (3.2-3.8GHz), downlink C-band (5.00-6.16 GHz), INSAT (7.04GHz), WLAN (8.09 GHz), X-band downlink (10.2-11.9 GHz) and radio navigation bands (24-28GHz). Furthermore, a Zenocross Shaped LC Decoupling Structure is integrated into the antenna feed line to minimize inter port coupling and improve isolation using stepped inductor and capacitors for frequency specific impedance matching. The ground plane features an Electromagnetic Band-Gap (EBG) structure, ensuring wideband impedance matching and interference suppression without increasing antenna size. A prototype was fabricated on an FR4 substrate using standard PCB photolithographic techniques, and experimental validation confirmed that the proposed antenna achieves an 85% reduction in mutual coupling, 92% suppression of unwanted interferences, and a bandwidth efficiency improvement of 40% over conventional designs. These combined simulation and fabrication results highlight the antenna’s potential for next-generation SWB MIMO communication systems.