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Hybrid Domain-Decomposition/Physical-Optics Analysis of Finite Reconfigurable Reflectarrays Using Characteristic-Mode Macrobasis Functions
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DOI：10.1109/lawp.2026.3697885.png)
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Abstract
En 中文
This letter presents an efficient hybrid domain-decomposition/physical-optics framework for analyzing finite, large-scale reflectarrays and reconfigurable intelligent surfaces. The structure is decomposed into exterior and interior domains coupled through a generalized aperture-admittance formulation. The exterior response is approximated using physical optics, while element behavior is captured through admittance operators. Scalability to large arrays and many tuning states is achieved via a macrobasis function expansion of the aperture current, which enables multistate analysis by reusing precharacterized element operators and updating only the elements that change state. Results for 8 × 8 and 20 × 20 arrays under different illuminations closely match full-wave references while substantially reducing memory usage and simulation time, demonstrating suitability for fast analysis and optimization of reconfigurable arrays.
Keywords:
Domain decomposition
generalized admittance
macrobasis functions
method of moments (MoM)
physical optics (PO)
reconfigurable intelligent surface (RIS)
reflectarray
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4.8
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2.8W
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