Highly Transparent Fully Metallic 1-Bit Coding Metasurfaces for Near-Field Transformation

This paper presents a low-cost coded metallic metasurface (CMM) to manipulate electromagnetic waves with a 1-bit fully metallic meta-atoms. The proposed CMM provides polarization-independent transmission for any code sequence at a low cost with a lightweight structure. The concept is validated with four different CMMs, which were characterized through full-wave numerical analysis. Each CMM can split the boresight beam into symmetric multi-beams in directions predicted through analytical formulations. This investigation reveals the significant potentialities of CMM as a building block to design multi-beam antenna systems.