Near-field beam shaping can be applied to near-field communication,wireless power transfer,etc.Near-field imaging antennas employing holographic metasurface have the advantages of low profile and flexible beam manipulation,not requiring a feeding network.Theoretical derivation,simulation analysis,and prototype validation of near-field imaging performance are carried out to both scalar and tensor holographic metasurfaces.Using tensor holographic metasurface,a near-field imaging antenna with an integrated planar feed is designed and fabricated.Good agreements are achieved between the simulated and measured results,validating that the metasurface is capable of near-field imaging using both left-and right-handed circular polarization.
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