Design and Analysis of Highly Isolated Slotted Circular Ring UWB MIMO Antenna with Band-Notched Characteristics

In this article, a novel and compact aperture area of $40 \times 40$ x $1.6 \mathrm{~mm}^{3}$ four-port Slotted Circular Ring (SCR) Ultra Wideband (UWB) MIMO antenna with notch band characteristics and high isolation is proposed. This work is predominantly concentrated on development of an UWBMIMO antenna with less design complexity and good performance, which emphasizes the concerted effort to enhance communication efficiency while minimizing the intricacies inherent in the design and implementation of UWB technology. Hexagonal structure merged with SCR enhanced the impedance bandwidth from 13.66 to 14.31 GHz, which is suitable for C-band, X-band and Ku-band applications. It covered the UWB from 4.19 to 18.5 GHz with a notch at C-band (5.06 to 5.64 GHz). In order to obtain isolation >25 dB, neutralization lines (NL) are placed between the antenna elements. Acceptable findings were obtained when evaluating the antenna’s performance in terms of diversity characteristics such as ECC, TARC, and DG. The maximum return loss $\left(\left|\mathrm{S}_{11}\right|\right)$ of $24.94 \mathrm{~dB}$ is achieved at 4.77GHz. The measured results of the fabricated prototype and the simulated results are in good agreement.