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Demonstrates improved performance in MIMO antennas for UWB applications, suggesting better isolation and reduced interference.
A compact quad‐band notched MIMO antenna is proposed for ultra‐wideband (UWB) and X‐band wireless applications. A funnel‐shaped strip is introduced at the center of the shared ground plane to suppress mutual coupling between radiating elements, thereby improving port isolation and overall performance. The antenna occupies an electrical size of 0.59 λg × 0.77 λg × 0.027 λg (at 2.4 GHz), with compact physical dimensions of 34.9 × 46 × 1.6 mm 3 . It operates over a wide frequency range from 2.4 to 11.5 GHz, achieving an impedance bandwidth of 130.9% for | S 11 | ≤ −10 dB. Quad‐band rejection is achieved by etching open‐ended I‐, L‐, and U‐shaped slots on the radiator and feed line. These slots effectively suppress interference from ISM/Bluetooth (2.2–2.8 GHz), WiMAX (3.1–3.7 GHz), WLAN (4.9–5.6 GHz), and C‐band (5.8–6.9 GHz) frequency bands. The design evolves from a single‐element UWB antenna into a dual‐port MIMO configuration and is validated through both simulation and experimental measurements. The results show good agreement, with isolation better than −20 dB and strong MIMO performance, including low envelope correlation, high diversity gain, and minimal channel capacity loss. These features make the antenna suitable for compact UWB, IoT, and high‐speed wireless communication systems.
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Mahato et al. (2026) studied this question.
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