Reincorporating Circuit Theory Into Information Theory

Multiple-Input Multiple-Output (MIMO) technology has emerged as a critical component in modern wireless communication systems. As antenna systems continue to evolve, the development and refinement of the corresponding information-theoretic bounds and achievability results remain essential in unlocking the full potential of future MIMO technologies in information transmission. To harness the benefits of such information-theoretic analysis, accurate modeling and analysis of the antenna's behavior are essential. Equivalent circuit models provide a valuable tool for understanding the performance limits of MIMO antennas. By providing a simplified representation of complex antenna structures, these models enable researchers to gain insights into the antenna's behavior, predict performance metrics, and optimize the system for optimal operation. This magazine paper reviews the advancements in the physical consistent modeling techniques of MIMO communications and sheds light on the potential avenues for further research and development in the field of information theory for advanced antenna structures and the role of circuit-based modeling.