  A chiral metastructure composed of spatially separated double semi-periodic
helices is proposed and investigated theoretically and experimentally in this
Letter. Chirality-dependent electromagnetically induced transparency (EIT) and
a slow light effect in the microwave region are observed from a numerical
parameter study, while experimental results from the 3D printing sample yield
good agreement with the theoretical findings. The studied EIT phenomenon arises
as a result of destructive interference by coupled resonances, and the proposed
chiral metastructure can be applied in areas such as polarization
communication, pump-probe characterization, and quantum computing areas.
