Array Synthesis of Circular Huygens Metasurfaces for Antenna Beam-Shaping

In this contribution, we discuss the modeling of cylindrical Huygens metasurfaces wrapping linear antennas through the array antenna theory. In particular, it is shown that the circular array pattern synthesis can be efficiently exploited to model conformal metasurfaces used for wavefront manipulation in view of beamforming applications. By considering the metasurface unit-cells as the equivalent radiating sources of a circular array, the shape of the emerging radiation pattern is accurately predicted. The proposed approach is validated through several examples where the radiation patterns are modified acting on the excitation phases of the equivalent circular array sources, and are compared with full-wave numerical simulations considering ideal coating metasurfaces designed with conventional techniques. This innovative design strategy allows to further expands the possibility enabled by metasurface coatings in radiation pattern manipulation, potentially improving the functionality of metasurfaces through full control over the radiation characteristics.