A Conformal CP Antenna Based on Isotropic Holographic Metasurface

A design scheme for a conformal circular polarization (CP) antenna based on an isotropic holographic metasurface is presented in this paper. On the basis of compensating the spatial phase difference generated by different element positions, a 90° phase difference is introduced by scalar impedance modulating the horizontal and vertical components of the surface wave propagated by the surface antenna, so that the surface wave propagated along the cylindrical surface is transformed into a CP wave. Based on the scalar impedance element and the proposed method, an isotropic holographic metasurface with 25 × 25 particles was constructed to produce CP radiation at 13.3 GHz. Realized the conversion of linearly polarized (LP) surface waves into CP waves through a cylindrical isotropic holographic metasurface composed of patch units. In particular, the CP beam has good directivity when the metasurface curvature changes in a certain range.