Beamforming by Left-Handed Extraordinary Transmission Metamaterial Bi- and Plano-Concave Lens at Millimeter-Waves
Miguel Navarro-Cía, Miguel Beruete, Igor Campillo, Mario Sorolla Ayza
IEEE Transactions on Antennas and Propagation
Volume: 59, Issue: 6, June 2011
Eggcrate lens, extraordinary transmission, metallic lens, metamaterials
A deep analysis of bi- and plano-concave lens made of stacked subwavelength hole arrays in terms of focus and angular power distribution is presented. 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, LHET-lenses 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.
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