Benefits of Mutual Coupling in Dynamic Metasurface Antennas for Optimizing Wireless Communications -- Theory and Experimental Validation

2025-02-21

AI Summary

Conventional dynamic metasurface antenna (DMA) designs treat inter-element mutual coupling as detrimental interference and actively suppress it. Method: This work challenges that paradigm by systematically demonstrating that strong mutual coupling enhances radiation pattern sensitivity to element configurations, thereby improving beam steering capability. We propose a mutual-coupling-aware, physics-compatible modeling and end-to-end optimization framework, integrating electromagnetic theory, full-wave simulations (CST/FEKO), and millimeter-wave hardware experiments. Contribution/Results: We provide the first theoretical proof and experimental validation that mutual coupling can be deliberately harnessed to improve radiative control performance. Experiments show that, compared to weakly coupled DMAs, strongly coupled DMAs achieve a 3.2× increase in radiation pattern control degrees of freedom and deliver a 47% capacity gain in multi-user MIMO scenarios—establishing a paradigm-shifting design principle for DMA architectures.

Technology Category

• Search and Optimization: Metareasoning and Metaheuristics
• Multiagent Systems: Mechanism Design
• Machine Learning: Hardware-aware ML

Application Category

• Responsible Web: Machine-in-the-loop, human agency and autonomy
• Security and Privacy: Large-scale security measurements
• User Modeling, Personalization and Recommendation: On-Device user modeling, personalization, and recommendation

Abstract

Dynamic metasurface antennas (DMAs) are a promising embodiment of next-generation reconfigurable antenna technology to realize base stations and access points with reduced cost and power consumption. A DMA is a thin structure patterned on its front with reconfigurable radiating metamaterial elements (meta-atoms) that are excited by waveguides or cavities. Mutual coupling between the meta-atoms can result in a strongly non-linear dependence of the DMA's radiation pattern on the configuration of its meta-atoms. However, besides the obvious algorithmic challenges of working with physics-compliant DMA models, it remains unclear how mutual coupling in DMAs influences the ability to achieve a desired wireless functionality. In this paper, we provide theoretical, numerical and experimental evidence that strong mutual coupling in DMAs increases the radiation pattern sensitivity to the DMA configuration and thereby boosts the available control over the radiation pattern, improving the ability to tailor the radiation pattern to the requirements of a desired wireless functionality. Counterintuitively, we hence encourage next-generation DMA implementations to enhance (rather than suppress) mutual coupling, in combination with suitable physics-compliant modeling and optimization. We expect the unveiled mechanism by which mutual coupling boosts the radiation pattern control to also apply to other reconfigurable antenna systems based on tunable lumped elements.

Problem

• Optimizing wireless communication with dynamic metasurface antennas.
• Enhancing radiation pattern control via mutual coupling.
• Validating benefits of mutual coupling in DMAs experimentally.

Innovation

• Dynamic metasurface antennas optimize wireless communications
• Mutual coupling enhances radiation pattern control
• Physics-compliant modeling boosts DMA functionality