Some experimental results on the dispersive behaviour of chiral composites

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Abstract
Planar samples consisting of a dispersion of high-permittivity ceramic helices of left and/or right handedness in epoxy host media were fabricated. Their normal incidence reflection and transmission coefficients were measured in the range 5.8-18 GHz using a free-space microwave system. The corresponding rotation angles and ellipticities were computed. A comparative study of the properties of the various composites is reported here; in particular their effectively chiral or non-chiral characteristics are demonstrated. The dispersive frequency response of the samples is presented and compared with that of composites containing metallic chiral inclusions.