Novel Antennas Based Upon Extraordinary Transmission Metamaterial Lenses

摘要

A deep analysis of bi- and plano-concave lens antennas made of stacked doubly period subwavelength hole arrays in terms of focus and angular power distribution is presented in this report. The key difference between these Left-Handed Extraordinary Transmission lenses (LHET-lenses) and the classical metallic lenses is based on the fact that contrary to the latter ones, LHETlenses work in the cut-off region of the circular waveguide formed by consecutive stacked holes. This leads to a negative index of refraction, whereas metallic lenses exhibit a positive but less than one index of refraction. Another activity done during this project is related with directivity enhancement by a short-focal-length plano-concave lens engineered by stacked subwavelength hole arrays (fishnet-like stack) with an effective negative index of refraction close to zero, n 0, that arises from and near-zero extreme values. The possible applications of these novel lenses in antenna engineering have been opened.