Broadband near-zero index metamaterials
K Konstantinidis, A P Feresidis
1st January 0001
pp 1 - 8
metasurfaces, near zero index, antennas
We present a new type of near-zero index (NZI) and epsilon near-zero (ENZ) metametarial with broad bandwidth characteristics. We propose an optimal geometry to manipulate the properties of the composite material and realize a metallic-dielectric NZI effective material operating at microwave frequencies with a broadband near-zero response. The effective material is composed by multiple layers of dissimilar metasurfaces of subwavelength dimensions. We emonstrate the broadband NZI metamaterial properties and study its anisotropy by realizing a radiating structure exhibiting broadband directive emission. An experimental demonstration validates the concept for an antenna in the microwave domain.
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