Electromagnetic metasurfaces (MTSs) are often assumed to be passive and lossless, and can be modeled as purely reactive homogenized impedance sheets on dielectric substrates. In this paper, a 3-D design procedure for reflective metasurfaces based on the integral equation method and impedance boundary conditions is presented. The metasurface consists of impedance sheets placed on top of a grounded dielectric slab, and the impedance values are optimized to match certain far-field (FF) power patterns or to beamform using the gradient-descent method.
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Qiu et al. (2024) studied this question.
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