design, simulation and fabrication of mimo antenna with multi-frequency coverage a lot of different types of wireless communication systems

This paper presents the design, simulation, fabrication, and testing of a mimo antenna optimized for wideband applications, with specific suitability for standards such as bluetooth, wi-fi, lte, and ieee 802.11 a/b/g/n. the antenna exhibits strong impedance matching over four operating bands: 2.17–2.62 ghz, 3.6–3.8 ghz, 6.68–8.42 ghz, and 8.85–24.85 ghz. the design incorporates a parasitic element to enhance isolation and reduce mutual coupling between 1×2 antenna elements, achieving an isolation level exceeding 21 db across the operating bands. simulated and measured results are in close agreement, with minor deviations attributed to fabrication tolerances and connector losses. the antenna maintains a stable gain between 3.9 db and 6.9 db, demonstrating excellent omnidirectional and bidirectional radiation patterns in the e-plane and h-plane, respectively. these results confirm the antenna's potential for use in modern wireless communication systems requiring compact designs, high isolation, and wideband performance.