ADVANCED MINIATURISED MIMO ARCHITECTURE: HIGH-ISOLATION FOUR-ELEMENT ANTENNA SYSTEM FOR NEXT-GENERATION WIRELESS CONNECTIVITY

Abstract

Purpose: The aim is to design a compact four-element 2×2 MIMO antenna with enhanced multi-resonant performance, extended impedance bandwidth, and improved port isolation for sub-6 GHz 5G, Wi-Fi 6E, and IoT applications. Design/Methodology/Approach: A compact rectangular MIMO antenna of 60×60 mm² is proposed, featuring two identical grooves and a slit to achieve multi-resonant performance. Orthogonal placement of patch elements is employed to improve port isolation and minimise mutual coupling. Simulations are performed to evaluate reflection coefficients, transmission coefficients, gain, and multiband performance. Findings: The antenna resonates at 1.99 GHz, 4.09 GHz, and 5.2 GHz, covering multiple wireless standards. The reflection coefficients are below –10 dB, and the transmission coefficients remain under –20 dB. The antenna achieves excellent port isolation, a gain range of 3.91–5.56 dBi, and optimal performance at 5.2 GHz. Research Limitation: The study is based on simulated results; experimental validation through fabrication and measurement is needed to confirm real-world performance. Practical Implication: The proposed antenna supports multiple wireless standards in a compact design, making it well-suited for smart homes, industrial wireless systems, and IoT networks. Social Implication: By enabling efficient, compact, and reliable wireless communication, the antenna contributes to the development of scalable IoT ecosystems and more innovative living environments. Originality/Value: This work presents a novel, compact 2×2 MIMO antenna design featuring orthogonal element placement and a dual-groove structure, which achieves multiband operation, high port isolation, and suitability for next-generation wireless applications.