Abstract
In this paper, we propose and demonstrate a multi-layered chiral structure consisting of a y-shape, a half-gammadion and an S-shape which possesses the property of asymmetric transmission for both linearly and circularly polarized waves in microwave frequency band. Numerical simulated results indicate that the chiral structure realizes a maximum asymmetric transmission of 0.88 and 0.31 for circularly and linearly polarized waves, respectively, which exhibit magnitude improvement over previous chiral metamaterials. Specifically, the maximum asymmetric transmitted coefficient of the designed structure is insensitivity to the incident angles at the resonance frequency. Additionally, we also study the influence of dielectric substrate thickness on the asymmetric transmission effect in detail.
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