The insatiable demand for higher data rates and improved connectivity in modern wireless communication systems critically relies on Multiple Input Multiple Output (MIMO) technology. However, the effective realization of MIMO's benefits, particularly in compact devices, is fundamentally constrained by the physical limitations of antenna design, primarily mutual coupling between radiating elements and high spatial correlation. This paper presents the design, analysis, and optimization of a novel 4x4 multi-band MIMO antenna array meticulously engineered for sub-6 GHz 5G and Wi-Fi 6 applications (2.4-2.5 GHz, 3.3-3.8 GHz, and 5.1-5.9 GHz). Our study reveals a unique combination of pattern diversity and polarization diversity techniques, employing a compact parasitic element structure and a meticulously optimized ground plane with integrated Defected Ground Structures (DGS) for enhanced isolation. Through comprehensive electromagnetic simulations and subsequent prototype fabrication and measurement, the antenna array consistently demonstrates an exceptional Envelope Correlation Coefficient (ECC) below 0.05, high port-to-port isolation exceeding 18 dB, and a stable radiation efficiency greater than 70% across all target bands. The compact footprint (e.g., 60x60 mm²) and robust performance metrics affirm the design's potential for seamless integration into next-generation smartphones, IoT devices, and other space-constrained wireless platforms, paving the way for significantly enhanced spectral efficiency and robust link reliability in real- world scenarios. This work offers a compelling solution to a pervasive challenge in wireless system design, pushing the boundaries of what is achievable in compact, high-performance MIMO antenna arrays.

Antenna, MIMO antenna, Pattern, Polarization, Antenna Array

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The insatiable demand for higher data rates and improved connectivity in modern wireless communication systems critically relies on Multiple Input Multiple Output (MIMO) technology. However, the effective realization of MIMO's benefits, particularly in compact devices, is fundamentally constrained by the physical limitations of antenna design, primarily mutual coupling between radiating elements and high spatial correlation. This paper presents the design, analysis, and optimization of a novel 4x4 multi-band MIMO antenna array meticulously engineered for sub-6 GHz 5G and Wi-Fi 6 applications (2.4-2.5 GHz, 3.3-3.8 GHz, and 5.1-5.9 GHz). Our study reveals a unique combination of pattern diversity and polarization diversity techniques, employing a compact parasitic element structure and a meticulously optimized ground plane with integrated Defected Ground Structures (DGS) for enhanced isolation. Through comprehensive electromagnetic simulations and subsequent prototype fabrication and measurement, the antenna array consistently demonstrates an exceptional Envelope Correlation Coefficient (ECC) below 0.05, high port-to-port isolation exceeding 18 dB, and a stable radiation efficiency greater than 70% across all target bands. The compact footprint (e.g., 60x60 mm²) and robust performance metrics affirm the design's potential for seamless integration into next-generation smartphones, IoT devices, and other space-constrained wireless platforms, paving the way for significantly enhanced spectral efficiency and robust link reliability in real- world scenarios. This work offers a compelling solution to a pervasive challenge in wireless system design, pushing the boundaries of what is achievable in compact, high-performance MIMO antenna arrays.

Antenna, MIMO antenna, Pattern, Polarization, Antenna Array

🔒 This is a subscription article

Full text is available to subscribers and institutional members. Please choose an option below to access it.