Polarization conversion in chiral layers with periodically arranged metallic helices

The polarization properties of periodically arranged metallic helices are investigated. The chiral layers have been synthesized by embedding right handed or left handed metallic helices arranged periodically in a dielectric matrix of thermocol (polystyrene foam), a low loss dielectric material. The chiral layers are loaded at the aperture of the transmitting rectangular waveguide horn antenna. The polarization pattern of the transmitted signal (TE _{10} mode) indicates rotation of plane of polarization and partial conversion into either right circular polarization(RCP) or left circular polarization (LCP).