In this paper, we present an overview of recent progress on metasurface-based circularly-polarized reflect- and transmit-arrays for millimeter-wave applications. The reflect- and transmit-arrays are composed of sub-wavelength unit cells containing multiple cascaded layers of anisotropic impedance surfaces. By utilizing either the Berry phase and/or dynamic phase, highly-directive circularly-polarized multibeams can be generated with a single feed or a cluster of feeds. Three proof-of-concept examples are showcased, which are all validated by experimental measurements.
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Jiang et al. (2020) studied this question.
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