A Circularly-Polarized Isoflux Antenna Based on Anisotropic Metasurface

By Gabriele Minatti, Stefano Maci, P. De Vita, Angelo Freni, M. Sabbadini. IEEE Transactions on Antennas and Propagation, 2012

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Modulated Metasurface Antennas for Space: Synthesis, Analysis and Realizations (2015, methodology): “If the dipole is placed on an anisotropic periodically modulated MTS with a small variation of its eigenvalues around an average value , one can approximate the tangential electric field through [4]”
Synthesis of Modulated-Metasurface Antennas With Amplitude, Phase, and Polarization Control (2016, methodology): “The Earth coverage is normally obtained with a 60° conical isoflux beam [6].”
Metasurfaces and their applications (2018, background): “An anisotropic holographic metasurface with a coplanar feed and circularly polarized radiation is shown in Figure 8F [120], which can be applied in space to ground satellite communications.”
Sidelobe Canceling for Reconfigurable Holographic Metamaterial Antenna (2014, background): “There have been several disparate approaches to realizing efficient holographic antennas, these include static artificial impedance surfaces [13]–[15], passive leaky-wave holographic antennas [16] (and the references”