  Engineering and optimization of wireless propagation channels will be one of
the key elements of future communication technologies. Metasurfaces may offer a
wide spectrum of functionalities for passive and tunable reflecting devices,
overcoming fundamental limits of commonly used conventional phase-gradient
reflectarrays and metasurfaces. In this paper, we develop an efficient way for
the design and implementation of metasurfaces with high-efficiency anomalous
reflector functionalities. The developed numerical method provides accurate,
fast, and simple metasurface designs, taking into account non-local near-field
interactions between array elements. The design method is validated by
manufacturing and experimental testing of highly efficient anomalous reflectors
for the millimetre-wave band.
