A wideband impedance-matrix framework for dynamic scattering arrays is derived, stacked intelligent metasurfaces are shown to be a special case, and the framework is applied to design beamforming, multi-user MISO, and MIMO precoding with superdirectivity.
Holographic communication using intel- ligent surfaces,
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Over-the-air Multifunctional Wideband Electromagnetic Signal Processing using Dynamic Scattering Arrays
A wideband impedance-matrix framework for dynamic scattering arrays is derived, stacked intelligent metasurfaces are shown to be a special case, and the framework is applied to design beamforming, multi-user MISO, and MIMO precoding with superdirectivity.