A Brief Study on MIMO Antenna Design and Isolation Enhancement Techniques for 5G Communications
摘要
The Fifth-Generation (5G) technology operates in the microwave and millimeter-wave band (30–300 GHz), offering significant advantages over previous generations in terms of data rates, geographical coverage, spectrum availability, latency, multi-application support, and energy efficiency. A dedicated frequency band has been allocated globally for 5G deployment. However, due to the inverse relationship between frequency and wavelength, 5G signals have shorter wavelengths than those in 3G and 4G, which operate in the lower microwave region. This results in increased fading and absorption, degrading system performance. To mitigate these challenges, Multi-Input Multi-Output (MIMO) technology has gained attention, as it employs multiple antennas to reduce multipath fading and enhance channel capacity. However, implementing MIMO introduces design complexities, including mutual coupling effects. This survey paper presents a comprehensive analysis of various MIMO antenna design approaches and advanced mutual coupling reduction techniques to optimize key performance parameters such as Envelope Correlation Coefficient (ECC) and Channel Capacity Loss (CCL) for 5G communication.