A multi-port S-parameter framework for unilateral active stacked intelligent metasurfaces enables a feed-forward cascade representation and a lower-complexity gradient-based optimization algorithm.
State of the art on stacked intelligent metasurfaces: Communication, sensing and computing in the wave domain
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From Multi-Port Models to Cascade Structures: Optimization of Active Unilateral Stacked Intelligent Metasurfaces
A multi-port S-parameter framework for unilateral active stacked intelligent metasurfaces enables a feed-forward cascade representation and a lower-complexity gradient-based optimization algorithm.