A Proposed MIMO Antenna Design for Ultra-Wideband THz Applications

In modern wireless communications networks, the demand for new frequency bands is incessantly increasing. One of main promising and feasible resources to be employed in wireless networks technology beyond 5G is the Terahertz frequency band which covers the range from 0.1THz up to 10THz. In this paper, a proposed Ultra-Wideband 2×2 MIMO antenna model for THz applications is introduced. One of the challenges in antenna designs in THz frequency bands is the increasing effect of mutual coupling between the antenna elements which results in a considerable impact on the overall performance of the antenna. Therefore, some techniques are implemented to mitigate the effect of mutual coupling on the performance of the MIMO antenna array such as high isolation, orthogonal positioning, parasitic structures, and loading slots. The proposed model in this paper consists of a 133×255µ
$m$
²
rectangular radiator with a circular cut in its middle. It will be shown that this design provides a large bandwidth of around 4.5THz (from 5.5THz up to 10THz), and hence this antenna can be used in high-speed wireless communication networks with high bit rate. Moreover, the performance of the proposed antenna is investigated in terms of various parameters such as Channel Capacity Loss (CCL) and Total Active Reflection Coefficient (TARC) then it is compared with other existing designs. It is found that the proposed model significantly outperforms the existing designs in different aspects.