Free-Space Focusing at C-Band Using a Flat Fully Printed Multilayer Metamaterial Lens


A volumetric metamaterial lens exhibiting a negative refractive index (NRI) at C-band is intended and its free-space focusing properties are experimentally verified. The designed lens employs a multilayer geometry and its unit cells are loaded using metal–insulator–metal (MIM) capacitors and twin-arm spiral inductors in a biplanar configuration. These components, although fully printed and without vias, offer robust reactive loading that enables a unit cell size of and allows the metamaterial’s dispersion properties to be accurately modeled within the effective-medium regime using an equivalent-circuit approach. It is also conducive to implementation at high frequencies, where surface-mount elements are unusable. The focusing properties of the fabricated lens are confirmed for a band of frequencies around five.0 GHz in an anechoic chamber using a free-house field probing system consisting of electrically tiny shielded-loop antennas affixed to a laptop-controlled scanner.

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